Re: [Sursound] [Proposal] for HOA web-streaming-format

[Hector Centeno]

Additionally, on the same Android device I get the same results with Chrome
and Firefox:

Audio codecs
PCM audio support
Yes ✔
MP3 support
Yes ✔
AAC support
Yes ✔
Dolby Digital support
No ✘
Dolby Digital Plus support
No ✘
Ogg Vorbis support
Yes ✔
Ogg Opus support
Yes ✔
WebM with Vorbis support
Yes ✔
WebM with Opus support
Yes ✔


On Tue, May 9, 2023, 8:42 a.m. Hector Centeno  wrote:

> Hello,
>
> I use Edge on Android and Windows machines. This is what I get on my
> Android device (latest Samsung Galaxy S23 Ultra):
>
> Audio codecs
> PCM audio support
> Yes ✔
> MP3 support
> Yes ✔
> AAC support
> Yes ✔
> Dolby Digital support
> No ✘
> Dolby Digital Plus support
> No ✘
> Ogg Vorbis support
> Yes ✔
> Ogg Opus support
> Yes ✔
> WebM with Vorbis support
> Yes ✔
> WebM with Opus support
> Yes ✔
>
> Best,
> Hector Centeno
>
>
>
>
>
> On Mon, May 8, 2023, 12:38 p.m. Stefan Schreiber 
> wrote:
>
>> Ammendment:
>>
>> “EAC-3 (DD+) is natively supported by Edge and all Safari browsers.”
>>
>> I did a fast html5test (.com) on my iPad running on some very old iOS
>> 13.x (for some stupid reason I can’t update my AirPad Air 2 to version
>> 15.x, which would be the last supported one; need probably to reset my
>> Apple ID to “recover” my lost password 🤭), and even in this outdated
>> configuration:
>>
>> DD+ is definitively supported by mobile Safari, see result list (here
>> posted in text format, sursound might not like htrml5 text...I hope
>> there won't be any "optical breakdown"...):
>>
>> Audio codecs
>>
>>
>>
>> PCM audio support
>>
>> No
>>
>> MP3 support
>>
>> Yes ✔
>>
>> AAC support
>>
>> Yes ✔
>>
>> Dolby Digital support
>>
>> Yes ✔
>>
>> Dolby Digital Plus support
>>
>> Yes ✔
>>
>> Ogg Vorbis support
>>
>> No ✘
>>
>> Ogg Opus support
>>
>> No ✘
>>
>> WebM with Vorbis support
>>
>> No ✘
>>
>> WebM with Opus support
>>
>> No ✘
>>
>> I don't think that iOS/iPadOS 16-x would show different results, by the
>> way.
>>
>> As there is no Safari adaptation for Windows, Linux etc., my statement
>> that any (more or less recent) Safati browser would support DD+ should
>> be correct.
>>
>> Edge: Supports all tested codecs (above) on Win10. (I don't know which
>> codecs the Edge browsers would support or better "would not support"
>> if running on other operating systems than Windows, but you can always
>> test via html5test.com)
>>
>> (Maybe this last question is a bit academic anyway... Edge is in the
>> very most cases used as desktop browser for Windows 10/11.)
>>
>> Best,
>>
>> Stefan
>>
>> - - - -
>>
>> > I think that mobile Safari (so the Safari version for iOS and
>> > iPadOS) should also support DD+ (since iOS 14/iPadOS 14 probably),
>> > because Apple Spatial Audio supports DD+/Atmos.
>> >
>> > I will try to test this. ;-)
>> >
>> > Otherwise, agreed.
>> >
>> > Best,
>> >
>> > Stefan
>> >
>> > - Mensagem de Fersch, Christof 
>> -
>> >
>> > Data: Mon, 8 May 2023 06:01:56 +
>> >
>> > De: "Fersch, Christof" 
>> >
>> > Assunto: Re: [Sursound] [Proposal] for HOA web-streaming-format
>> >
>> > Para: Surround Sound discussion group 
>> >
>> >> You are right on EDGE and Safari on *PC platforms*. Firefox,
>> >> Chrome, … are a different story. And there is more differences
>> >> depending on which platform the browser is running (Windows,
>> >> Android, iOS, MacOS, …). What I wanted to say is that you would
>> >> need to be more specific for a statement on browser support (is
>> >> always a combination of browser, OS, maybe even HW).
>> >>
>> >> Nevertheless, I of course agree MPEG-H support on Browser/OS is not
>> >> “very widespread”. However, it also offers features/compression
>> >> which are much more advanced than what currently deployed codecs
>> >> can do.
>> >>
>> >> Ok, I see, thanks for clarifying. The statement below refers to DD
>> >> (not DD+).
>> >>
>> >> //Christof
>> >>
>> >> From: Sursound  on behalf of Stefan
>> >> Schreiber 
>> >>
>> >> Date: Sa

Re: [Sursound] [Proposal] for HOA web-streaming-format

[Hector Centeno]

Hello,

I use Edge on Android and Windows machines. This is what I get on my
Android device (latest Samsung Galaxy S23 Ultra):

Audio codecs
PCM audio support
Yes ✔
MP3 support
Yes ✔
AAC support
Yes ✔
Dolby Digital support
No ✘
Dolby Digital Plus support
No ✘
Ogg Vorbis support
Yes ✔
Ogg Opus support
Yes ✔
WebM with Vorbis support
Yes ✔
WebM with Opus support
Yes ✔

Best,
Hector Centeno





On Mon, May 8, 2023, 12:38 p.m. Stefan Schreiber 
wrote:

> Ammendment:
>
> “EAC-3 (DD+) is natively supported by Edge and all Safari browsers.”
>
> I did a fast html5test (.com) on my iPad running on some very old iOS
> 13.x (for some stupid reason I can’t update my AirPad Air 2 to version
> 15.x, which would be the last supported one; need probably to reset my
> Apple ID to “recover” my lost password 🤭), and even in this outdated
> configuration:
>
> DD+ is definitively supported by mobile Safari, see result list (here
> posted in text format, sursound might not like htrml5 text...I hope
> there won't be any "optical breakdown"...):
>
> Audio codecs
>
>
>
> PCM audio support
>
> No
>
> MP3 support
>
> Yes ✔
>
> AAC support
>
> Yes ✔
>
> Dolby Digital support
>
> Yes ✔
>
> Dolby Digital Plus support
>
> Yes ✔
>
> Ogg Vorbis support
>
> No ✘
>
> Ogg Opus support
>
> No ✘
>
> WebM with Vorbis support
>
> No ✘
>
> WebM with Opus support
>
> No ✘
>
> I don't think that iOS/iPadOS 16-x would show different results, by the
> way.
>
> As there is no Safari adaptation for Windows, Linux etc., my statement
> that any (more or less recent) Safati browser would support DD+ should
> be correct.
>
> Edge: Supports all tested codecs (above) on Win10. (I don't know which
> codecs the Edge browsers would support or better "would not support"
> if running on other operating systems than Windows, but you can always
> test via html5test.com)
>
> (Maybe this last question is a bit academic anyway... Edge is in the
> very most cases used as desktop browser for Windows 10/11.)
>
> Best,
>
> Stefan
>
> - - - -
>
> > I think that mobile Safari (so the Safari version for iOS and
> > iPadOS) should also support DD+ (since iOS 14/iPadOS 14 probably),
> > because Apple Spatial Audio supports DD+/Atmos.
> >
> > I will try to test this. ;-)
> >
> > Otherwise, agreed.
> >
> > Best,
> >
> > Stefan
> >
> > - Mensagem de Fersch, Christof  -
> >
> > Data: Mon, 8 May 2023 06:01:56 +
> >
> > De: "Fersch, Christof" 
> >
> > Assunto: Re: [Sursound] [Proposal] for HOA web-streaming-format
> >
> > Para: Surround Sound discussion group 
> >
> >> You are right on EDGE and Safari on *PC platforms*. Firefox,
> >> Chrome, … are a different story. And there is more differences
> >> depending on which platform the browser is running (Windows,
> >> Android, iOS, MacOS, …). What I wanted to say is that you would
> >> need to be more specific for a statement on browser support (is
> >> always a combination of browser, OS, maybe even HW).
> >>
> >> Nevertheless, I of course agree MPEG-H support on Browser/OS is not
> >> “very widespread”. However, it also offers features/compression
> >> which are much more advanced than what currently deployed codecs
> >> can do.
> >>
> >> Ok, I see, thanks for clarifying. The statement below refers to DD
> >> (not DD+).
> >>
> >> //Christof
> >>
> >> From: Sursound  on behalf of Stefan
> >> Schreiber 
> >>
> >> Date: Saturday, 6. May 2023 at 00:41
> >>
> >> To: Surround Sound discussion group 
> >>
> >> Subject: Re: [Sursound] [Proposal] for HOA web-streaming-format
> >>
> >> Short answer:
> >>
> >> EAC-3 (DD+) is natively supported by Edge and all Safari browsers.
> >>
> >> I  really was refering to this one...
> >>
> >> AC-3 patents should have expired by now, but of course this codec is a
> >>
> >> bit old. (And won’t support even 7.1, by the way. The highest channel
> >>
> >> count would be 6.1, and the B channel would be matrixed into 5.1. If
> >>
> >> my memory is correctly working. But probably yes... ;-)
> >>
> >> Thanks,
> >>
> >> Stefan
> >>
> >> ...
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Re: [Sursound] Suitable headphones for monitoring binaural compositions

[Hector Centeno]

That's true. On the other hand, with the recordings I make using over the
ear mics I do get a strong height effect (e.g. airplanes flying above or
birds calling from trees).

On Fri., Jun. 19, 2020, 6:39 p.m. Augustine Leudar, <
augustineleu...@gmail.com> wrote:

> Hi Hector - strictly speaking for it to be a binaural recording it would
> have to be done in-ear, or in a dummy heads ear,  otherwise you would only
> have ILDs and ITDs and not the height information that is caused by the
> direction dependant filtering of the pinna (and to some extent shoulders) .
> However here I am creating binaural soundscape sin a DAW using a VST
> binaural panner rather than recordings .
>
> On Fri, 19 Jun 2020 at 23:20, Hector Centeno  wrote:
>
> > I'm wondering if it is the case that if the ambisonic recording is made
> > with in-ear microphones then earbuds would make more sense, and if it's
> > done with microphones outside the ear (clipped on the sides of the head
> or
> > above the ear) then over-the-ear headphones would work. I record using
> > microphones over the ear and I find that playback using closed back
> > over-the-ear headphones works the best.
> >
> > Hector
> >
> >
> > On Fri, Jun 19, 2020 at 6:13 PM Augustine Leudar <
> > augustineleu...@gmail.com>
> > wrote:
> >
> > > Hello all,
> > > I normally do installation work but lockdown has steered me towards
> > working
> > > on binaural work that can be streamed. Obviously, with speakers, I
> have a
> > > calibrated system, room treatment etc I have a pair of Sennheiser
> HD600s
> > > that I use but it occurs to me that these kinds of over-ear headphones
> > may
> > > not be best suited for binaural work as there may be some pinna
> filtering
> > > seeing as the driver is as large as my pinna, so I was thinking earbuds
> > > might be more suitable as they bypass the pinna altogether and you are
> > just
> > > left with the HRTFs - then again like mastering it depends somewhat on
> > what
> > > your target audience will be using mostly. Has anyone given any thought
> > to
> > > this and what do you think are the most suitable headphones for
> binaural
> > > work?
> > > all the beat
> > > Augustine
> > >
> > > --
> > > Artist website: www.augustineleudar.com
> > > Business website: www.magikdoor.net
> > > +44(0)7555784775
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> > > ___
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>
> --
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Re: [Sursound] Suitable headphones for monitoring binaural compositions

[Hector Centeno]

I'm wondering if it is the case that if the ambisonic recording is made
with in-ear microphones then earbuds would make more sense, and if it's
done with microphones outside the ear (clipped on the sides of the head or
above the ear) then over-the-ear headphones would work. I record using
microphones over the ear and I find that playback using closed back
over-the-ear headphones works the best.

Hector


On Fri, Jun 19, 2020 at 6:13 PM Augustine Leudar 
wrote:

> Hello all,
> I normally do installation work but lockdown has steered me towards working
> on binaural work that can be streamed. Obviously, with speakers, I have a
> calibrated system, room treatment etc I have a pair of Sennheiser HD600s
> that I use but it occurs to me that these kinds of over-ear headphones may
> not be best suited for binaural work as there may be some pinna filtering
> seeing as the driver is as large as my pinna, so I was thinking earbuds
> might be more suitable as they bypass the pinna altogether and you are just
> left with the HRTFs - then again like mastering it depends somewhat on what
> your target audience will be using mostly. Has anyone given any thought to
> this and what do you think are the most suitable headphones for binaural
> work?
> all the beat
> Augustine
>
> --
> Artist website: www.augustineleudar.com
> Business website: www.magikdoor.net
> +44(0)7555784775
> -- next part --
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Re: [Sursound] Ambisonic Audio - Interactive Installation

[Hector Centeno]

I wonder if when talking about IMU's they should call it something
different, like "9 degrees of measurement" or "9 degrees of sensing" since
it's not freedom related to spatial movement. This particularly now that
spatial tracking is being used more prominently in consumer technology.

On Sat, Oct 5, 2019 at 12:57 PM Stefan Schreiber 
wrote:

> To avoid some potential confusion:
>
> Most modern IMU sensors are supposed to offer “9 degrees of freedom”.
>
> (Directional 3-axis information from accelerometer, gyroscope and
> magnetometer.)
>
> If refering to tracking, you speak “just” of 3DoF (orientation) or 6
> DoF tracking (orientation + positional data).
>
> Further reading
>
> https://developers.google.com/vr/discover/degrees-of-freedom
>
> (for example)
>
> Best,
>
> Stefan
>
> P.S.: 9 or 10 degrees of freedom certainly sounds better than 6DoF...
>
> (Of course this is the raw sensor data before fusion, which probaby
> will give 3DoF orientation data as result. It could be discussed if
> quaternion orientation is 3DoF or 4DoF, though.  If 4DoF, an OHTI 6DoF
> pose would be rather 7DoF... I refuse to take part in the following
> discussion about 7DoF tracking, which means once more: I’m out!   😉)
>
> - - -
>
> Citando Bo-Erik Sandholm :
>
> > The ohti Projects for a open headtracker has been slow but will hopefully
> >
> >  be updated soon.
> >
> >  It is only for so called 9 degrees of freedom, no position data only
> >
> >  directional info with 2 degrees precision.
> >
> >
> >
> >  Data is currently quaternions over serial communication to control the
> >
> >  omnitone binaural decoder.
> >
> >  The host software written in JavaScript could with a bit of help have
> the
> >
> >  added functionality to send OSC.
> >
> >  There already exists a library to send OSC for JavaScript.
> >
> >
> >
> >  Den tis 1 okt. 2019 13:11Hector Centeno  skrev:
> >
> >> Hi Jack,
> >>
> >>
> >>
> >>  Yes, I saw those Bose but inertial sensors won't work for precise
> tracking.
> >>
> >>  I've done a lot of arkit/arcore with phones and tablets and it works
> great
> >>
> >>  but I don't want to be looking through a screen with a 2D
> representation of
> >>
> >>  the world while experiencing a sound only environment (unless you
> strap the
> >>
> >>  device to headphones with the camera facing forward, but that would be
> not
> >>
> >>  very convenient).
> >>
> >>
> >>
> >>  Cheers,
> >>
> >>
> >>
> >>  Hector
> >>
> >>
> >>
> >>  On Tue., Oct. 1, 2019, 4:18 a.m. jack reynolds, <
> jackreynolds...@gmail.com
> >>
> >>
> >>
> >>  wrote:
> >>
> >>
> >>
> >>  The new Bose headphones have 6dof tracking, but the accelerometers are
> >>
> >>  not
> >>
> >>  terribly accurate, so they are more 3dof really, unless you implement
> >>
> >>  ARKit
> >>
> >>  or similar.
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Re: [Sursound] Ambisonic Audio - Interactive Installation

[Hector Centeno]

Hi Jack,

Yes, I saw those Bose but inertial sensors won't work for precise tracking.
I've done a lot of arkit/arcore with phones and tablets and it works great
but I don't want to be looking through a screen with a 2D representation of
the world while experiencing a sound only environment (unless you strap the
device to headphones with the camera facing forward, but that would be not
very convenient).

Cheers,

Hector

On Tue., Oct. 1, 2019, 4:18 a.m. jack reynolds, 
wrote:

> The new Bose headphones have 6dof tracking, but the accelerometers are not
> terribly accurate, so they are more 3dof really, unless you implement ARKit
> or similar.
>
>
>
> On Mon, 30 Sep 2019 at 15:29, Hector Centeno  wrote:
>
> > I've been wanting to create work in this way for a while now (6DOF
> > audio-only augmented reality). This audio augmentation is what I found
> > appealing when I tried the Magic Leap AR headset for the first time since
> > it's very well implemented there (as opposed to the disappointing visual
> > quality). I wish someone will soon produce headphones with 6DOF tracking
> > (will require cameras to perform SLAM). In the meantime, I'm also waiting
> > for Intel to add Android support to their RealSense Tracking Camera T265
> [
> > https://www.intelrealsense.com/tracking-camera-t265 ] which they claim
> is
> > on the works. This would allow strapping one of those sensors to a pair
> of
> > headphones and running an Android app that does the spatialization (I
> > agree with Przemyslaw that using a game engine such as Unity or Unreal
> > would make things very easy, even in this scenario or in a sever based
> > one).
> >
> > Cheers,
> >
> > Hector
> >
> >
> > On Mon, Sep 30, 2019 at 3:31 AM Przemysław Danowski <
> > przemyslaw.danow...@chopin.edu.pl> wrote:
> >
> > > Michelle,
> > >
> > > You could look at game engines like Unreal or Unity, and if you can get
> > > headtrackers send OSC to the engine you will get coordinates for the
> > > position of the players head. You can use native multiplayer feature of
> > the
> > > engines. You could employ Kinect camera to trace position of the
> players
> > in
> > > the room.
> > >
> > > It would be very easy to implement using VR/AR 6DoF headsets, where you
> > > have room position tracking and headtracking combined and the SDK ready
> > to
> > > use.
> > >
> > > best,
> > >
> > >
> > > Przemyslaw Danowski
> > > Sound Engineering Department
> > > Fryderyk Chopin University of Music
> > > mob.+48603700626
> > > www.chopin.edu.pl <http://www.chopin.edu.pl/>
> > >
> > > UMFC VR : virtual exhibition
> > > http://fb.me/umfcvr <http://fb.me/umfcvr>
> > > > Wiadomość napisana przez Michelle Irving <
> > > michelle.irv...@soleilsound.com  michelle.irv...@soleilsound.com
> > >>
> > > w dniu 27.09.2019, o godz. 19:22:
> > > >
> > > > Hi,
> > > >
> > > > I'm working with an artist who wants to explore Ambisonic Audio
> > > > and use the Audeze Mobius headphones in an audio installation.
> > > > The soundscape will consist of recordings of various individual
> vocals
> > > > spatialized
> > > > throughout the "room". There is a video projection overhead. Hard
> sync
> > is
> > > > not required.
> > > >
> > > > Questions:
> > > > 1.Is it possible to exploit the headtracking of the Mobius headphones
> > to
> > > > give each person and individualized experience of the audio
> > composition.
> > > > ie. Person A is in the far left front corner and hearing a particular
> > > voice
> > > > in close proximity while Person B is in the far back right corner
> > barely
> > > > hearing what Person A is hearing?
> > > >
> > > > 2.If the Answer to 1. is YES - would you recommend using Max/Msp or
> > > Arduino
> > > > for configuring hte individual playbacks (mappings between headphones
> > and
> > > > some sort of player)
> > > >
> > > > 3.I've looked at the Waves NX toolkit and I don't see a feature to
> > > > determine virtual room size?Am I missing something or is there other
> > tech
> > > > that could allow me to map the headtracker to a specific roomsize?
> > > >
> > > > 4.Open to better ideas how to achieve an i

Re: [Sursound] Ambisonic Audio - Interactive Installation

[Hector Centeno]

I've been wanting to create work in this way for a while now (6DOF
audio-only augmented reality). This audio augmentation is what I found
appealing when I tried the Magic Leap AR headset for the first time since
it's very well implemented there (as opposed to the disappointing visual
quality). I wish someone will soon produce headphones with 6DOF tracking
(will require cameras to perform SLAM). In the meantime, I'm also waiting
for Intel to add Android support to their RealSense Tracking Camera T265 [
https://www.intelrealsense.com/tracking-camera-t265 ] which they claim is
on the works. This would allow strapping one of those sensors to a pair of
headphones and running an Android app that does the spatialization (I
agree with Przemyslaw that using a game engine such as Unity or Unreal
would make things very easy, even in this scenario or in a sever based one).

Cheers,

Hector


On Mon, Sep 30, 2019 at 3:31 AM Przemysław Danowski <
przemyslaw.danow...@chopin.edu.pl> wrote:

> Michelle,
>
> You could look at game engines like Unreal or Unity, and if you can get
> headtrackers send OSC to the engine you will get coordinates for the
> position of the players head. You can use native multiplayer feature of the
> engines. You could employ Kinect camera to trace position of the players in
> the room.
>
> It would be very easy to implement using VR/AR 6DoF headsets, where you
> have room position tracking and headtracking combined and the SDK ready to
> use.
>
> best,
>
>
> Przemyslaw Danowski
> Sound Engineering Department
> Fryderyk Chopin University of Music
> mob.+48603700626
> www.chopin.edu.pl 
>
> UMFC VR : virtual exhibition
> http://fb.me/umfcvr 
> > Wiadomość napisana przez Michelle Irving <
> michelle.irv...@soleilsound.com >
> w dniu 27.09.2019, o godz. 19:22:
> >
> > Hi,
> >
> > I'm working with an artist who wants to explore Ambisonic Audio
> > and use the Audeze Mobius headphones in an audio installation.
> > The soundscape will consist of recordings of various individual vocals
> > spatialized
> > throughout the "room". There is a video projection overhead. Hard sync is
> > not required.
> >
> > Questions:
> > 1.Is it possible to exploit the headtracking of the Mobius headphones to
> > give each person and individualized experience of the audio composition.
> > ie. Person A is in the far left front corner and hearing a particular
> voice
> > in close proximity while Person B is in the far back right corner barely
> > hearing what Person A is hearing?
> >
> > 2.If the Answer to 1. is YES - would you recommend using Max/Msp or
> Arduino
> > for configuring hte individual playbacks (mappings between headphones and
> > some sort of player)
> >
> > 3.I've looked at the Waves NX toolkit and I don't see a feature to
> > determine virtual room size?Am I missing something or is there other tech
> > that could allow me to map the headtracker to a specific roomsize?
> >
> > 4.Open to better ideas how to achieve an interactive Ambisonic audio
> > soundscape that works with multiple headsets.
> >
> > thanks!
> > Michelle
> >
> > --
> >
> > Michelle Irving
> >
> > Post-Audio Supervisor
> >
> > 416-500-1631
> >
> > 507 King St. East
> >
> > Toronto, Ontario
> >
> > www.soleilsound.com 
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Re: [Sursound] Looking for virtual mic equations for 2nd order

[Hector Centeno]

Thnak you very much Fons. I appreciate the explanation, it's very helpful
(It's also hard to find comprehensive literature about it). It would be
great to see those Python scripts, thank you for offering to send them.

Cheers,

Hector


On Tue, Apr 9, 2019 at 3:53 PM Fons Adriaensen  wrote:

> Hello Hector,
>
> > As quoted below, some time ago Fons kindly provided the equations to
> > extract virtual microphone signals from an ambisonic 1st order
> soundfield.
> > I was wondering, is there a set of available and known formulas to
> extract
> > virtual microphones from 2nd order recordings, taking advantage of the
> > higher spatial resolution?
>
> If you want first order virtual mics you can use the same formulas,
> just drop the higher order signals. Note that the equations you quoted
> are for FuMa normalisation, higher order signal sets today would probably
> use SN3D. For SN3D, remove the sqrt(2) in the first equation.
>
> If you want 2nd or higher order virtual mics things get a bit
> more complicated. Of course any polar pattern is just a weighted
> sum of the AMB components. But for higher order you get a lot more
> choices. Now if you limit the choice to axisymmetric patterns things
> get easier. Axisymmetric polar patterns are those that depend only
> on the angle between the axis of the mic and the direction of the
> source, i.e. you can imagine the pattern as something that is
> rotated around an axis in a given direction. All first order
> patterns are axisymmetric, but higher order ones don't have to be.
>
> But even for axisymmetric higher order patterns you need more than
> some simple equations that I could copy into an mailing list post.
> I could sent you some python code that computes the gain factors
> for higher order axisymmetric virtual mics. Let me know if you're
> interested.
>
> Ciao,
>
> --
> FA
>
> ___
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[Sursound] Looking for virtual mic equations for 2nd order

[Hector Centeno]

Hello,

As quoted below, some time ago Fons kindly provided the equations to
extract virtual microphone signals from an ambisonic 1st order soundfield.
I was wondering, is there a set of available and known formulas to extract
virtual microphones from 2nd order recordings, taking advantage of the
higher spatial resolution? Does it make sense or the formula applies the
same only utilizing the 1st order part of it? I've seen some plugins doing
spherical processing to achieve this but that's an area I'm not familiar
with.

Thanks!

Hector



On Fri, Jul 19, 2013 at 10:37 AM Fons Adriaensen 
wrote:

> On Fri, Jul 19, 2013 at 09:56:40AM -0400, Hector Centeno wrote:
>
> > I'm trying to implement virtual microphones derived from first order
> > ambisonic soundfields using Csound. I was wondering if anyone had any
> > resources to share with equations that would allow me to achieve this,
> > specifying azimuth, elevation and directivity of the mic. I've been
> > analyzing Fons' code for Tetraproc (the Virtmic class) but I'm having
> > difficulties understanding some parts of it (but I'll keep trying). I
> found
> > the paper "Has Ambisonics Come of Age?" by Bruce Wiggins which contains
> > equations for doing this but it seems that it only takes azimuth angle in
> > consideration.
>
> Given
>
> A = mic direction azimuth
> E = mic direction elevation
> D = directivity, [0...1], 0 = omni, 0.5 = cardioid, 1 = fig-8
>
> and assuming your B-format is FuMA, compute
>
>   cw = sqrt(2) * (1 - D)
>   cx = cos(A) * cos(E) * D
>   cy = sin(A) * cos(E) * D
>   cz = sin(E) * D
>
> and then the output signal for the mic is
>
>   cw * W + cx * X + cy * Y + cz * Z
>
> Ciao,
>
> --
> FA
>
> A world of exhaustive, reliable metadata would be an utopia.
> It's also a pipe-dream, founded on self-delusion, nerd hubris
> and hysterically inflated market opportunities. (Cory Doctorow)
>
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> https://mail.music.vt.edu/mailman/listinfo/sursound
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Re: [Sursound] Open HeadTracking Initiative OHTI - Release announcement

[Hector Centeno]

This is great Bo-Erik! I will definitively look into adding support to
AmbiExplorer for this tracker. I found a couple of sources online where to
buy the components but I was wondering if there's any particular breakout
boards for those ICs that you would recommend (both for the F52832 BT/SoC
and the BNO055 IMU). I would like to also look into designing a 3D
printable enclosure for it.

Cheers!

Hector
On Fri, May 18, 2018 at 8:56 AM Bo-Erik Sandholm 
wrote:

> I want to present OHTI, a combination of open Software, Firmware and HW
for
> listening to Ambisonic recordings in Ambix format and with a plan for
> listening to channel based Audio in the future,

> The Manifesto at
> https://github.com/bossesand/OHTI/blob/master/OHTI%20v.14.doc describe the
> current status and the plans for the future on a technical level soutable
> for sursound members.


> All the software and descriptions of needed HW is available at
> https://github.com/bossesand/OHTI

> The Headtracker is using BLE for communication with the host software and
> is built with  nrf52832 and BNO055 for drift free headtracking.
>   All of the host software is JS/node.js or JS/HTML5 based to allow it to
> work on many different platforms.

> We have in this alpha release Ambisonic 2 players implementations with
> headtracking activated using Omnitone or JSAmbisonics.

> We also describe how to convert a personal HRTF SOFA file for use with
each
> of the players.

> We have tested the implementations on Linux (Ubuntu), OSX and Win10  with
> HTML5 capable Browsers like Chrome and Firefox.

> We have received support or assistance from a number  of members on the
> sursound list since the slow start in 2014.


> We hope for continued support and assistance in this effort to make
> headphone sound more realistic ( out of the head )  and promote surround
> sound for music and not only in VR context.

> We also hope that you can make it possible to use this headtracker with
> other Ambisonic Soundfield Binaural decodes.
> We do of course also appreciate any corrections or further assistance in
> development of this concept.


> Best Regards

> Open Headtracking Initiative for Audio (OHTI)

> Bo-Erik Sandholm, Stockholm

> Roger Sandholm, Stockholm

> Stefan Schreiber, Lisbon
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Re: [Sursound] Upcoming update to AmbiExplorer

[Hector Centeno]

Thanks Mark,

F-Droid looks great. I'll try it too. Thank you for offering help.

Cheers,

Hector

On Sat, Apr 21, 2018, 10:27 AM Marc Lavallée,  wrote:

> Le 18-04-21 à 10:20, Hector Centeno a écrit :
> > Hello Fons,
> >
> > Thank you for your reply. Those conditions are easy to fulfill and I have
> > no problem sticking to them or any other that facilitate access to the
> > software.
> >
> >   The source code you found is the latest. There hasn't been any updates
> > since then (I'm planning to work on it soon). As for hosting the APK
> > outside of Google Play, I can definitely do that. I'll put it on my
> > website, unless someone has a suggestion for a centralized repository
> that
> > doesn't require an account. I'll also look into it. I will also upload
> the
> > source to GitHub so it's easier to track.
> >
> > Cheers and thanks again.
> >
> > Hector
>
> Hector,
>
> The F-Droid repo would be ideal:
>
> https://f-droid.org/
>
> I can help you if you are interested.
>
> --
>
> Marc
>
>
> > On Sat, Apr 21, 2018, 3:59 AM Fons Adriaensen, 
> wrote:
> >
> >> On Fri, Apr 20, 2018 at 06:51:50PM +, Hector Centeno wrote:
> >>
> >>> It all depends
> >>> on the source code of the OctoMic version (octofile and octoproc) not
> >>> having any licensing restrictions. Fons mentioned that the software's
> >>> source will be available only to OctoMic buyers so I'm not sure if that
> >>> implies it won't be open source.
> >> The precise license terms for Octomic/Octofile have not yet been
> decided.
> >>
> >> Regarding porting to Android, at least the following conditions will
> >> have to be satisfied:
> >>
> >> * The complete and up-to-date source code of the Android version must
> >>be available to all.
> >>
> >> * It must be possible to do a binary install the Android app without
> >>involving a Google account, Google Services, or any form of user
> >>registration.
> >>
> >>
> >> ATM it's not even clear if these conditions are satisfied for the
> >> Android version of Tetrafile. The only source code I found dates
> >> from 2014.
> >>
> >> Ciao,
> >>
> >> --
> >> FA
> >>
> >> ___
> >> Sursound mailing list
> >> Sursound@music.vt.edu
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> >> edit account or options, view archives and so on.
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Re: [Sursound] Upcoming update to AmbiExplorer

[Hector Centeno]

I guess if I'm uploading the code to GitHub I could just put the APK there
too.



On Sat, Apr 21, 2018, 10:20 AM Hector Centeno,  wrote:

> Hello Fons,
>
> Thank you for your reply. Those conditions are easy to fulfill and I have
> no problem sticking to them or any other that facilitate access to the
> software.
>
>  The source code you found is the latest. There hasn't been any updates
> since then (I'm planning to work on it soon). As for hosting the APK
> outside of Google Play, I can definitely do that. I'll put it on my
> website, unless someone has a suggestion for a centralized repository that
> doesn't require an account. I'll also look into it. I will also upload the
> source to GitHub so it's easier to track.
>
> Cheers and thanks again.
>
> Hector
>
> On Sat, Apr 21, 2018, 3:59 AM Fons Adriaensen, 
> wrote:
>
>> On Fri, Apr 20, 2018 at 06:51:50PM +, Hector Centeno wrote:
>>
>> > It all depends
>> > on the source code of the OctoMic version (octofile and octoproc) not
>> > having any licensing restrictions. Fons mentioned that the software's
>> > source will be available only to OctoMic buyers so I'm not sure if that
>> > implies it won't be open source.
>>
>> The precise license terms for Octomic/Octofile have not yet been decided.
>>
>> Regarding porting to Android, at least the following conditions will
>> have to be satisfied:
>>
>> * The complete and up-to-date source code of the Android version must
>>   be available to all.
>>
>> * It must be possible to do a binary install the Android app without
>>   involving a Google account, Google Services, or any form of user
>>   registration.
>>
>>
>> ATM it's not even clear if these conditions are satisfied for the
>> Android version of Tetrafile. The only source code I found dates
>> from 2014.
>>
>> Ciao,
>>
>> --
>> FA
>>
>> ___
>> Sursound mailing list
>> Sursound@music.vt.edu
>> https://mail.music.vt.edu/mailman/listinfo/sursound - unsubscribe here,
>> edit account or options, view archives and so on.
>>
>
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Re: [Sursound] Upcoming update to AmbiExplorer

[Hector Centeno]

Hello Fons,

Thank you for your reply. Those conditions are easy to fulfill and I have
no problem sticking to them or any other that facilitate access to the
software.

 The source code you found is the latest. There hasn't been any updates
since then (I'm planning to work on it soon). As for hosting the APK
outside of Google Play, I can definitely do that. I'll put it on my
website, unless someone has a suggestion for a centralized repository that
doesn't require an account. I'll also look into it. I will also upload the
source to GitHub so it's easier to track.

Cheers and thanks again.

Hector

On Sat, Apr 21, 2018, 3:59 AM Fons Adriaensen,  wrote:

> On Fri, Apr 20, 2018 at 06:51:50PM +, Hector Centeno wrote:
>
> > It all depends
> > on the source code of the OctoMic version (octofile and octoproc) not
> > having any licensing restrictions. Fons mentioned that the software's
> > source will be available only to OctoMic buyers so I'm not sure if that
> > implies it won't be open source.
>
> The precise license terms for Octomic/Octofile have not yet been decided.
>
> Regarding porting to Android, at least the following conditions will
> have to be satisfied:
>
> * The complete and up-to-date source code of the Android version must
>   be available to all.
>
> * It must be possible to do a binary install the Android app without
>   involving a Google account, Google Services, or any form of user
>   registration.
>
>
> ATM it's not even clear if these conditions are satisfied for the
> Android version of Tetrafile. The only source code I found dates
> from 2014.
>
> Ciao,
>
> --
> FA
>
> ___
> Sursound mailing list
> Sursound@music.vt.edu
> https://mail.music.vt.edu/mailman/listinfo/sursound - unsubscribe here,
> edit account or options, view archives and so on.
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Re: [Sursound] Upcoming update to AmbiExplorer

[Hector Centeno]

Hi Bearcat,

Thank you for your kind words. I would like to add OctoMic support to the
TetraFile Android app, and I already had thought about it. It all depends
on the source code of the OctoMic version (octofile and octoproc) not
having any licensing restrictions. Fons mentioned that the software's
source will be available only to OctoMic buyers so I'm not sure if that
implies it won't be open source.

Cheers,

Hector



On Fri, Apr 20, 2018 at 2:06 PM Bearcat M. Şándor 
wrote:

> Hey Hector, thank you for your great work with Ambisonics for Android.
>
> Are you planning to support the octomic with TetraFile?
>
> On Fri, Apr 20, 2018, 05:56 Hector Centeno  wrote:
>
> > Hi Richard,
> >
> > Thank you for your comments. I agree that it's needed to create awareness
> > of what Ambisonics is, which is why I included a short explanation and
> > links to resources in the app's description (I can't add more due to word
> > count limitations).
> >
> > Regarding your UHJ question, I'm guessing it's a wording issue. Would
> > "transcodes to stereo UHJ" or "encodes B-Format to stereo UHJ" make more
> > sense?
> >
> > Thanks again!
> >
> > Hector
> >
> >
> >
> > On Fri, Apr 20, 2018, 2:25 AM richard ford, 
> wrote:
> >
> > > It's good to see the continut'growth in Ambisonics, but looking at your
> > > play store page for this app the general public needs to be made more
> > aware
> > > of what Ambisonics is and its benefits fot the future of 'surround
> sound'
> > > And on that point, sort of, i do have a question for Hector. You state
> on
> > > the Play Store that the app "decodes to UHJ". Now that sounds
> confusing,
> > is
> > > it worded wrongly or is there something i'm missing here?
> > > R
> > >
> > > Sent from Yahoo Mail on Android
> > >
> > >   On Fri, 20 Apr 2018 at 5:08, Hector Centeno
> wrote:
> > >  Hello,
> > >
> > > After a long while, I've decided it is finally time to update my
> Android
> > > app AmbiExplorer [
> > >
> https://play.google.com/store/apps/details?id=net.hcenteno.ambiexplorer
> > ].
> > > I'm developing it on my spare time but I'm hoping to include at least
> > these
> > > new features:
> > >
> > > - Add HOA playback, up to 3rd order using Google's Resonance decoder
> (for
> > > now, later will try to add a variety of HRTF selections)
> > > - Include Google's Resonance decoder as an option for FOA playback in
> > > addition to the current HRTF sets
> > > - Support both FuMa and AmbiX formats
> > > - Possibly support TBA (Facebook 360 Audio)
> > > - Support loading custom HRTFs (I also want to look into possibly
> adding
> > > SOFA support)
> > > - I've also considered adding a VR mode where the user would be placed
> > in a
> > > visually neutral space (dimly lit) as an alternative to head-tracked
> > > headphones (this might also elicit a more focused listening attitude),
> > and
> > > possibly add the option of assigning 360 panoramas to audio files to be
> > > displayed during playback.
> > >
> > > These updates will be released in stages during this year but the
> first 3
> > > are already on their way and hopefully will be released soon.
> > >
> > > If anyone has any feedback about these updates or would like to suggest
> > any
> > > other features or changes please let me know!
> > >
> > > Best regards,
> > >
> > > Hector Centeno
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> 

Re: [Sursound] Upcoming update to AmbiExplorer

[Hector Centeno]

Hi Richard,

Thank you for your comments. I agree that it's needed to create awareness
of what Ambisonics is, which is why I included a short explanation and
links to resources in the app's description (I can't add more due to word
count limitations).

Regarding your UHJ question, I'm guessing it's a wording issue. Would
"transcodes to stereo UHJ" or "encodes B-Format to stereo UHJ" make more
sense?

Thanks again!

Hector



On Fri, Apr 20, 2018, 2:25 AM richard ford,  wrote:

> It's good to see the continut'growth in Ambisonics, but looking at your
> play store page for this app the general public needs to be made more aware
> of what Ambisonics is and its benefits fot the future of 'surround sound'
> And on that point, sort of, i do have a question for Hector. You state on
> the Play Store that the app "decodes to UHJ". Now that sounds confusing, is
> it worded wrongly or is there something i'm missing here?
> R
>
> Sent from Yahoo Mail on Android
>
>   On Fri, 20 Apr 2018 at 5:08, Hector Centeno wrote:
>  Hello,
>
> After a long while, I've decided it is finally time to update my Android
> app AmbiExplorer [
> https://play.google.com/store/apps/details?id=net.hcenteno.ambiexplorer ].
> I'm developing it on my spare time but I'm hoping to include at least these
> new features:
>
> - Add HOA playback, up to 3rd order using Google's Resonance decoder (for
> now, later will try to add a variety of HRTF selections)
> - Include Google's Resonance decoder as an option for FOA playback in
> addition to the current HRTF sets
> - Support both FuMa and AmbiX formats
> - Possibly support TBA (Facebook 360 Audio)
> - Support loading custom HRTFs (I also want to look into possibly adding
> SOFA support)
> - I've also considered adding a VR mode where the user would be placed in a
> visually neutral space (dimly lit) as an alternative to head-tracked
> headphones (this might also elicit a more focused listening attitude), and
> possibly add the option of assigning 360 panoramas to audio files to be
> displayed during playback.
>
> These updates will be released in stages during this year but the first 3
> are already on their way and hopefully will be released soon.
>
> If anyone has any feedback about these updates or would like to suggest any
> other features or changes please let me know!
>
> Best regards,
>
> Hector Centeno
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[Sursound] Upcoming update to AmbiExplorer

[Hector Centeno]

Hello,

After a long while, I've decided it is finally time to update my Android
app AmbiExplorer [
https://play.google.com/store/apps/details?id=net.hcenteno.ambiexplorer ].
I'm developing it on my spare time but I'm hoping to include at least these
new features:

- Add HOA playback, up to 3rd order using Google's Resonance decoder (for
now, later will try to add a variety of HRTF selections)
- Include Google's Resonance decoder as an option for FOA playback in
addition to the current HRTF sets
- Support both FuMa and AmbiX formats
- Possibly support TBA (Facebook 360 Audio)
- Support loading custom HRTFs (I also want to look into possibly adding
SOFA support)
- I've also considered adding a VR mode where the user would be placed in a
visually neutral space (dimly lit) as an alternative to head-tracked
headphones (this might also elicit a more focused listening attitude), and
possibly add the option of assigning 360 panoramas to audio files to be
displayed during playback.

These updates will be released in stages during this year but the first 3
are already on their way and hopefully will be released soon.

If anyone has any feedback about these updates or would like to suggest any
other features or changes please let me know!

Best regards,

Hector Centeno
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Re: [Sursound] Waves NX head tracker and third party applications

[Hector Centeno]

Hello Dave,

Thank you for the reply. Yes, I've seen the Audioease one before and seems
like it's based on a generic IMU module so that one should be easy to reuse
for other projects. I've developed Arduino based trackers before but I just
wanted to find a good use for the Waves tracker. I also considered adding
support for the NX tracker to my AmbiExplorer Android app and I emailed
them asking if they would support third party apps to use their tracker but
got a negative response. They are not supporting that at all. The nice
thing about the NX tracker is that is very compact and lightweight.

Best,

Hector



On Mon, Nov 6, 2017 at 1:16 PM Dave Hunt 
wrote:

> Hi Hector,
>
> This is probably very similar to the one Audioease are offering to drive
> their "360 pan suite" set of plug-ins
>
> https://www.audioease.com/360/
>
> You have to scroll down a bit to find the head tracker. The manual gives
> more info in its appendix
>
> https://www.audioease.com/360/files/360pan-suite-3-Pro-Tools-Manual-1.0.pdf
>
> I think you're right, the data is encoded. Max or pd may be able to decode
> it, though I can't find any note of it on the user forum. Some have used
> similar devices, and have used Arduino to descramble the data.
>
> This is all beyond my coding abilities, especially as I haven't been able
> to find any explanation of the coding and how to derive meaningful
> orientation data from it. Obviously you have to be fairly advanced coder,
> who knows where to find the library and know how to use, it to get going.
> Perhaps it is only available to OEM developers ??
>
> If anyone knows how to get started that could keep some of us busy. I'd
> love one of these that works with my Max patches, and I'm sure I'm not the
> only one.
>
> Ciao,
>
> Dave Hunt
>
>
>
>
>
> >   1. Waves NX head tracker and third party applications
> >  (Hector Centeno)
> >
> > From: Hector Centeno 
> > Subject: [Sursound] Waves NX head tracker and third party applications
> > Date: 6 November 2017 16:17:59 GMT
> > To: sursound@music.vt.edu
> >
> >
> > Hello,
> >
> > I got a Waves NX Head Tracker [
> > https://www.waves.com/hardware/nx-head-tracker ] and I was wondering if
> > anyone here has managed to use the Bluetooth transmitted data for other
> > applications than the Waves ones? From what I found seems like the data
> > transmitted is encoded but I just wanted to double check in case someone
> > has found something different. I find both the Waves VST plugin and their
> > mobile app a bit inferior in sound quality, particularly the mobile app,
> so
> > I was wondering if I could manage to use the tracker with other
> > applications.
> >
> > Cheers!
> >
> > Hector
>
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[Sursound] Waves NX head tracker and third party applications

[Hector Centeno]

Hello,

I got a Waves NX Head Tracker [
https://www.waves.com/hardware/nx-head-tracker ] and I was wondering if
anyone here has managed to use the Bluetooth transmitted data for other
applications than the Waves ones? From what I found seems like the data
transmitted is encoded but I just wanted to double check in case someone
has found something different. I find both the Waves VST plugin and their
mobile app a bit inferior in sound quality, particularly the mobile app, so
I was wondering if I could manage to use the tracker with other
applications.

Cheers!

Hector
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Re: [Sursound] Stand alone recorder with built-in mics

[Hector Centeno]

I wish they provided some audio recording samples other than what's in the
videos. Does anyone here know the gentleman in their promo video? He seems
to be based in Toronto so it would be great to touch base with him.

Best,

Hector


On Wed, Oct 26, 2016 at 9:27 PM Steven Boardman 
wrote:

> More product folks.
> Nothing to do with me, but just came up on the radar
>
> https://www.indiegogo.com/projects/twirling720-vr-audio-recorder#/
>
> Fun times..
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Re: [Sursound] AmbiExplorer for Andriod version 2.1 out

[Hector Centeno]

... and by the way, I just released version 2.2 of AmbiExplorer with the
LISTEN library added back. There are now both ATK/CIPIC and LISTEN HRTFs
available.

Best,

Hector


On Mon, Mar 9, 2015 at 1:20 AM Hector Centeno  wrote:

> Hello Brian,
>
> Thank you for suggesting using SOFA and sorry for the very delayed reply.
> It makes sense and I will look into it. I'm using Csound as the audio
> engine and the convolution opcode expects wav or aiff files (it uses
> libsndfile) so it won't work out of the box. I think it would be great to
> have a SOFAlizer opcode in Csound, I'll probably look into programming one.
>
> Best,
>
> Hector
>
>
> On Mon, Jan 12, 2015 at 6:03 AM Brian FG Katz  wrote:
>
>> Dear Hector,
>>
>> I be interested to hear a bit more about your HRTF choice and reasoning. I
>> would also inquire whether you consider the option of the use selecting
>> the
>> HRTF of their choice, using some universal HRTF format, like SOFA
>> (http://www.sofaconventions.org/) ?
>>
>> Best regards,
>>
>> -Brian FG Katz
>>
>> > From: hcen...@gmail.com
>> > Date: Thu, 1 Jan 2015 01:51:21 +
>> > To: sursound@music.vt.edu
>> > Subject: [Sursound] AmbiExplorer for Andriod version 2.1 out
>> >
>> > Hello,
>> >
>> > I just would like to share that I just posted a new version of
>> > AmbiExplorer to GooglePlay and it should be live within a few hours.
>> >
>> > The only change is that I switched it to use the optimized CIPIC HRTFs
>> > from the Ambisonic Toolkit [ http://www.ambisonictoolkit.net/ ]
>> > instead of the LISTEN sets. This means much improved ambisonic to
>> binaural
>> transcoding.
>> >
>> > Big thanks to Joseph Anderson for his great work and for sharing it.
>> >
>> > Happy New Year!
>> >
>> > Best,
>> >
>> > Hector Centeno
>>
>> --
>> Brian FG Katz, Ph.D, HDR
>> Resp. Groupe Audio & Acoustique
>>
>> LIMSI - CNRS
>> Rue John von Neumann
>> Campus Universitaire d'Orsay
>> Bât 508
>> 91405 Orsay cedex
>> France
>> Phone. +  33 (0)1 69 85 80 67 - Fax.  +  33 (0)1 69 85 80 88
>> http://www.limsi.frweb_group: http://www.limsi.fr/Scientifique/aa/
>> web_theme: http://www.limsi.fr/Scientifique/aa/thmsonesp/
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Re: [Sursound] AmbiExplorer for Andriod version 2.1 out

[Hector Centeno]

Hello Brian,

Thank you for suggesting using SOFA and sorry for the very delayed reply.
It makes sense and I will look into it. I'm using Csound as the audio
engine and the convolution opcode expects wav or aiff files (it uses
libsndfile) so it won't work out of the box. I think it would be great to
have a SOFAlizer opcode in Csound, I'll probably look into programming one.

Best,

Hector

On Mon, Jan 12, 2015 at 6:03 AM Brian FG Katz  wrote:

> Dear Hector,
>
> I be interested to hear a bit more about your HRTF choice and reasoning. I
> would also inquire whether you consider the option of the use selecting the
> HRTF of their choice, using some universal HRTF format, like SOFA
> (http://www.sofaconventions.org/) ?
>
> Best regards,
>
> -Brian FG Katz
>
> > From: hcen...@gmail.com
> > Date: Thu, 1 Jan 2015 01:51:21 +
> > To: sursound@music.vt.edu
> > Subject: [Sursound] AmbiExplorer for Andriod version 2.1 out
> >
> > Hello,
> >
> > I just would like to share that I just posted a new version of
> > AmbiExplorer to GooglePlay and it should be live within a few hours.
> >
> > The only change is that I switched it to use the optimized CIPIC HRTFs
> > from the Ambisonic Toolkit [ http://www.ambisonictoolkit.net/ ]
> > instead of the LISTEN sets. This means much improved ambisonic to
> binaural
> transcoding.
> >
> > Big thanks to Joseph Anderson for his great work and for sharing it.
> >
> > Happy New Year!
> >
> > Best,
> >
> > Hector Centeno
>
> --
> Brian FG Katz, Ph.D, HDR
> Resp. Groupe Audio & Acoustique
>
> LIMSI - CNRS
> Rue John von Neumann
> Campus Universitaire d'Orsay
> Bât 508
> 91405 Orsay cedex
> France
> Phone. +  33 (0)1 69 85 80 67 - Fax.  +  33 (0)1 69 85 80 88
> http://www.limsi.frweb_group: http://www.limsi.fr/Scientifique/aa/
> web_theme: http://www.limsi.fr/Scientifique/aa/thmsonesp/
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Re: [Sursound] AmbiExplorer for Andriod version 2.1 out

[Hector Centeno]

Hi Umashankar,
Sorry for the delayed reply. Any tablet or phone with Android 4.1 and up
and with a CPU of at least 1GHz should work. I recommend that if you are
going for a tablet to get something like the Nexus 7 (2013 model) or Nexus
9. If you are aiming at a phone, a Nexus 5 or 6 should work fine or any
Galaxy S4 and up. In the future I might integrate alternative decoding
techniques that might require a much powerful device so I would recommend
to get something newer.

Best,

Hector



On Sun, Jan 11, 2015, 3:37 AM umashankar manthravadi 
wrote:

> dear hector
>
> I want to buy an android tablet just to be able to use your software. can
> you tell me what is the minimum specifications - android version etc - that
> I should look for. I will buy on aliexpress.
>
> umashankar
>
> > From: hcen...@gmail.com
> > Date: Thu, 1 Jan 2015 01:51:21 +
> > To: sursound@music.vt.edu
> > Subject: [Sursound] AmbiExplorer for Andriod version 2.1 out
> >
> > Hello,
> >
> > I just would like to share that I just posted a new version of
> AmbiExplorer
> > to GooglePlay and it should be live within a few hours.
> >
> > The only change is that I switched it to use the optimized CIPIC HRTFs
> from
> > the Ambisonic Toolkit [ http://www.ambisonictoolkit.net/ ] instead of
> the
> > LISTEN sets. This means much improved ambisonic to binaural transcoding.
> >
> > Big thanks to Joseph Anderson for his great work and for sharing it.
> >
> > Happy New Year!
> >
> > Best,
> >
> > Hector Centeno
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[Sursound] AmbiExplorer for Andriod version 2.1 out

[Hector Centeno]

Hello,

I just would like to share that I just posted a new version of AmbiExplorer
to GooglePlay and it should be live within a few hours.

The only change is that I switched it to use the optimized CIPIC HRTFs from
the Ambisonic Toolkit [ http://www.ambisonictoolkit.net/ ] instead of the
LISTEN sets. This means much improved ambisonic to binaural transcoding.

Big thanks to Joseph Anderson for his great work and for sharing it.

Happy New Year!

Best,

Hector Centeno
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Re: [Sursound] AmbiExplorer version 2 video

[Hector Centeno]

Hello all,

After some delay, version 2 of AmbiExplorer is finally out and available at
the Google Play store:
https://play.google.com/store/apps/details?id=net.hcenteno.ambiexplorer

As always, please contact me if you find any problems.

Best,

Hector Centeno

On Wed, Aug 6, 2014 at 9:55 PM, Hector Centeno  wrote:

> Hello,
>
> I just would like to share here with the community the new features
> COMING SOON in version 2.0 of AmbiExplorer.
>
> A walkthrough video is available here: http://youtu.be/gOsfo8or_0E
>
> Please, feel free to make any comments, suggestions or requests in the
> list or to my personal email. I'm planning on making the update
> available within the next two weeks but I'm willing to delay it if
> there are any requests that I think could be implemented easily.
>
> My interest as a sound artist has been very influenced by the
> practices of field recording, soundscape based sound art and acoustic
> ecology. This is the reason why part of the new features are library
> management and library import/export (online/offline) and geotagging
> that would allow others to share location based ambisonic sound art
> work or field recordings (the exported .ambxp file is a simple CSV
> file with a structure described in the help section of the app). The
> other major features are Bluetooth head-tracking, HRTF selection from
> the LISTEN database and improved UHJ to binaural decoding. More
> details below:
>
> NEW FEATURES
>
> - First run user interface tutorial
> - New library system for importing 4 channel, dual stereo or UHJ files
> - Select an HRTF for binaural decoding from the full IRCAM LISTEN database
> - Connection to an external Bluetooth head-tracker with communication
> protocol based on the Razor AHRS project:
> https://github.com/ptrbrtz/razor-9dof-ahrs/wiki/Tutorial
> - Library item geolocation and Map view
> - Library item description/title editable
> - Create location placeholders using GPS (good for tracking locations
> during field recordings) or by long-pressing on the Map View. The
> placeholders can later be assigned to ambisonic files
> - Playback using automatic location based triggering that also works
> while the app is running in the background (with status bar
> notification)
> - Import and Export libraries as CSV files with extension .ambxp. The
> exported libraries include the geolocation and title data.
> - Import libraries from internet sources
> - Greatly iImproved UHJ to binaural decoding
> - Decode B-Format to stereo UHJ
> - Improved internal sensors stability
> - Several bug fixes and interface improvements
>
> Version 1 demo video: http://youtu.be/EJc85yACwjk
>
> http://hcenteno.net/software.html
>
> Best,
>
> Hector Centeno
>
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[Sursound] AmbiExplorer version 2 video

[Hector Centeno]

Hello,

I just would like to share here with the community the new features
COMING SOON in version 2.0 of AmbiExplorer.

A walkthrough video is available here: http://youtu.be/gOsfo8or_0E

Please, feel free to make any comments, suggestions or requests in the
list or to my personal email. I'm planning on making the update
available within the next two weeks but I'm willing to delay it if
there are any requests that I think could be implemented easily.

My interest as a sound artist has been very influenced by the
practices of field recording, soundscape based sound art and acoustic
ecology. This is the reason why part of the new features are library
management and library import/export (online/offline) and geotagging
that would allow others to share location based ambisonic sound art
work or field recordings (the exported .ambxp file is a simple CSV
file with a structure described in the help section of the app). The
other major features are Bluetooth head-tracking, HRTF selection from
the LISTEN database and improved UHJ to binaural decoding. More
details below:

NEW FEATURES

- First run user interface tutorial
- New library system for importing 4 channel, dual stereo or UHJ files
- Select an HRTF for binaural decoding from the full IRCAM LISTEN database
- Connection to an external Bluetooth head-tracker with communication
protocol based on the Razor AHRS project:
https://github.com/ptrbrtz/razor-9dof-ahrs/wiki/Tutorial
- Library item geolocation and Map view
- Library item description/title editable
- Create location placeholders using GPS (good for tracking locations
during field recordings) or by long-pressing on the Map View. The
placeholders can later be assigned to ambisonic files
- Playback using automatic location based triggering that also works
while the app is running in the background (with status bar
notification)
- Import and Export libraries as CSV files with extension .ambxp. The
exported libraries include the geolocation and title data.
- Import libraries from internet sources
- Greatly iImproved UHJ to binaural decoding
- Decode B-Format to stereo UHJ
- Improved internal sensors stability
- Several bug fixes and interface improvements

Version 1 demo video: http://youtu.be/EJc85yACwjk

http://hcenteno.net/software.html

Best,

Hector Centeno
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Re: [Sursound] B-Fromat microphone

[Hector Centeno]

Hi Conor,

It was www.shapeways.com You can make your uploaded models available to
others. If the mic proves to be useful I'll make the parts public so others
can order them directly.

Best,

Hector
On May 21, 2014 2:28 PM, "Conor Mulvey"  wrote:

> Hector,
>
> That's a great price for 3D printing in metal. What company did you use?
>
> Thanks,
> Conor
>
>
> On Wed, May 21, 2014 at 2:16 PM, Hector Centeno  wrote:
>
> > Hi Dave,
> >
> > Yes, the metal frame was 3D printed. It costed about $28.
> >
> > Best,
> >
> > Hector
> > Dave Malham wrote:
> >
> >  Good  grief - you printed the metal frame? I thought that was still very
> > > expensive?
> > >
> > > Dave
> > >
> > >
> >
> > It would be cheaper to print the capsules. 'Cos you would need less
> > material than for the frame...   :-)
> >
> > Stefan
> >
> >
> >
> > > On 5 May 2014 22:15, Hector Centeno  wrote:
> > >
> > >
> > >
> > >> No, the capsules are not printed (it would be great if I could!). The
> > >> white
> > >> holder and metal frame where 3D printed.
> > >>
> > >> Best,
> > >>
> > >> Hector
> > >> On May 5, 2014 2:00 PM, "Stefan Schreiber" 
> > wrote:
> > >>
> > >>
> > >>
> > >>> Hector Centeno wrote:
> > >>>
> > >>> Hello all,
> > >>>
> > >>>
> > >>>> I've been experimenting with making a native B-Format mic using 3D
> > >>>>
> > >>>>
> > >>> printed
> > >>
> > >>
> > >>> parts. I've done some recordings with it and I was wondering if
> people
> > >>>> here
> > >>>> with ambisonic playback systems could give one of them a try. Any
> > >>>>
> > >>>>
> > >>> comments
> > >>
> > >>
> > >>> will be very appreciated.
> > >>>>
> > >>>> A photo of the mic: http://www.hcenteno.net/extras/b-format_mic.jpg
> > >>>> Link to binaural decode and link to B-Format file (in the
> > description):
> > >>>> https://soundcloud.com/hcenteno/wow-what-is-that-papa
> > >>>>
> > >>>> Change the level of the W channel to taste (the W capsule is more
> > >>>> sensitive
> > >>>> than the rest so I had to reduce it to what sounded good to me).
> > >>>>
> > >>>> Thanks and best wishes,
> > >>>>
> > >>>> Hector
> > >>>>
> > >>>>
> > >>>>
> > >>>>
> > >>> Really cool, and very creative!
> > >>>
> > >>> < Which > parts did you actually print? You can't print the capsules
> > >>> itself, can you?
> > >>>
> > >>> It is probably not just me who would like to ask this question...
> > >>>
> > >>> Best regards,
> > >>>
> > >>> Stefan
> > >>>
> > >>> ___
> > >>> Sursound mailing list
> > >>> Sursound@music.vt.edu
> > >>> https://mail.music.vt.edu/mailman/listinfo/sursound
> > >>>
> > >>>
> > >>>
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> > >>
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> > >>
> > >
> > >
> > >
> > >
> > >
> >
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Re: [Sursound] B-Fromat microphone

[Hector Centeno]

Hi Dave,

Yes, the metal frame was 3D printed. It costed about $28.

Best,

Hector
Dave Malham wrote:

 Good  grief - you printed the metal frame? I thought that was still very
> expensive?
>
> Dave
>
>

It would be cheaper to print the capsules. 'Cos you would need less
material than for the frame...   :-)

Stefan



> On 5 May 2014 22:15, Hector Centeno  wrote:
>
>
>
>> No, the capsules are not printed (it would be great if I could!). The
>> white
>> holder and metal frame where 3D printed.
>>
>> Best,
>>
>> Hector
>> On May 5, 2014 2:00 PM, "Stefan Schreiber"  wrote:
>>
>>
>>
>>> Hector Centeno wrote:
>>>
>>> Hello all,
>>>
>>>
>>>> I've been experimenting with making a native B-Format mic using 3D
>>>>
>>>>
>>> printed
>>
>>
>>> parts. I've done some recordings with it and I was wondering if people
>>>> here
>>>> with ambisonic playback systems could give one of them a try. Any
>>>>
>>>>
>>> comments
>>
>>
>>> will be very appreciated.
>>>>
>>>> A photo of the mic: http://www.hcenteno.net/extras/b-format_mic.jpg
>>>> Link to binaural decode and link to B-Format file (in the description):
>>>> https://soundcloud.com/hcenteno/wow-what-is-that-papa
>>>>
>>>> Change the level of the W channel to taste (the W capsule is more
>>>> sensitive
>>>> than the rest so I had to reduce it to what sounded good to me).
>>>>
>>>> Thanks and best wishes,
>>>>
>>>> Hector
>>>>
>>>>
>>>>
>>>>
>>> Really cool, and very creative!
>>>
>>> < Which > parts did you actually print? You can't print the capsules
>>> itself, can you?
>>>
>>> It is probably not just me who would like to ask this question...
>>>
>>> Best regards,
>>>
>>> Stefan
>>>
>>> ___
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>>> Sursound@music.vt.edu
>>> https://mail.music.vt.edu/mailman/listinfo/sursound
>>>
>>>
>>>
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>>
>>
>
>
>
>
>

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Re: [Sursound] B-Fromat microphone

[Hector Centeno]

Hello Umashankar,

Yes, they are all 10mm capsules. The bi-directional capsules are EM-183,
probably the same as the Zoom H2n, and the omni is a EM-172.

Best,

Hector



On Mon, May 5, 2014 at 9:33 PM, umashankar manthravadi <
umasha...@hotmail.com> wrote:

> dear hector
>
> what capsules did you use? these look like 10 mm. Zoom h2n uses something
> similar for the s part of the ms microphone but I have not seen omnis.
>
> I like the 3d print. my own version uses six cardioid capsules, but I
> never completed it.
>
> umashankar
>
> > Date: Mon, 5 May 2014 13:40:45 -0400
> > From: hcen...@gmail.com
> > To: sursound@music.vt.edu
> > Subject: [Sursound] B-Fromat microphone
> >
> > Hello all,
> >
> > I've been experimenting with making a native B-Format mic using 3D
> printed
> > parts. I've done some recordings with it and I was wondering if people
> here
> > with ambisonic playback systems could give one of them a try. Any
> comments
> > will be very appreciated.
> >
> > A photo of the mic: http://www.hcenteno.net/extras/b-format_mic.jpg
> > Link to binaural decode and link to B-Format file (in the description):
> > https://soundcloud.com/hcenteno/wow-what-is-that-papa
> >
> > Change the level of the W channel to taste (the W capsule is more
> sensitive
> > than the rest so I had to reduce it to what sounded good to me).
> >
> > Thanks and best wishes,
> >
> > Hector
> > -- next part --
> > An HTML attachment was scrubbed...
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> >
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Re: [Sursound] B-Fromat microphone

[Hector Centeno]

Thank you David,

The flamingos should be in the front only but spreading left to right. I'll
upload some more samples soon. I'll try to record one with more localized
sound sources at different locations.

Best,

Hector
On May 5, 2014 3:21 PM, "David Pickett"  wrote:

> Bravo on the mic!
>
> I have played your file (as my set up is restricted to 4.0 horizontal
> mode, I have only matrixed channels W, X & Y).  I find it difficult to know
> at what level to set the W channel, as what appears to be going on all
> around is (excuse me, no offence intended!) rather chaotic.  Could you
> provide a file of someone talking at the front, rear and sides of the
> array?  This would enable calibration of the relative levels of WXY.
>
> I spent some time doing this with my own pantophonic mic recently and was
> pleased with the results.
>
> David
>
> At 19:40 05-05-14, Hector Centeno wrote:
> >Hello all,
> >
> >I've been experimenting with making a native B-Format mic using 3D printed
> >parts. I've done some recordings with it and I was wondering if people
> here
> >with ambisonic playback systems could give one of them a try. Any comments
> >will be very appreciated.
> >
> >A photo of the mic: http://www.hcenteno.net/extras/b-format_mic.jpg
> >Link to binaural decode and link to B-Format file (in the description):
> >https://soundcloud.com/hcenteno/wow-what-is-that-papa
> >
> >Change the level of the W channel to taste (the W capsule is more
> sensitive
> >than the rest so I had to reduce it to what sounded good to me).
> >
> >Thanks and best wishes,
> >
> >Hector
> >-- next part --
> >An HTML attachment was scrubbed...
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> ><https://mail.music.vt.edu/mailman/private/sursound/attachments/201405
> >05/cfda5ca1/attachment.html>
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Re: [Sursound] B-Fromat microphone

[Hector Centeno]

No, the capsules are not printed (it would be great if I could!). The white
holder and metal frame where 3D printed.

Best,

Hector
On May 5, 2014 2:00 PM, "Stefan Schreiber"  wrote:

> Hector Centeno wrote:
>
>  Hello all,
>>
>> I've been experimenting with making a native B-Format mic using 3D printed
>> parts. I've done some recordings with it and I was wondering if people
>> here
>> with ambisonic playback systems could give one of them a try. Any comments
>> will be very appreciated.
>>
>> A photo of the mic: http://www.hcenteno.net/extras/b-format_mic.jpg
>> Link to binaural decode and link to B-Format file (in the description):
>> https://soundcloud.com/hcenteno/wow-what-is-that-papa
>>
>> Change the level of the W channel to taste (the W capsule is more
>> sensitive
>> than the rest so I had to reduce it to what sounded good to me).
>>
>> Thanks and best wishes,
>>
>> Hector
>>
>>
>
> Really cool, and very creative!
>
> < Which > parts did you actually print? You can't print the capsules
> itself, can you?
>
> It is probably not just me who would like to ask this question...
>
> Best regards,
>
> Stefan
>
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[Sursound] B-Fromat microphone

[Hector Centeno]

Hello all,

I've been experimenting with making a native B-Format mic using 3D printed
parts. I've done some recordings with it and I was wondering if people here
with ambisonic playback systems could give one of them a try. Any comments
will be very appreciated.

A photo of the mic: http://www.hcenteno.net/extras/b-format_mic.jpg
Link to binaural decode and link to B-Format file (in the description):
https://soundcloud.com/hcenteno/wow-what-is-that-papa

Change the level of the W channel to taste (the W capsule is more sensitive
than the rest so I had to reduce it to what sounded good to me).

Thanks and best wishes,

Hector
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Re: [Sursound] AmbiExplorer

[Hector Centeno]

The source for the TetraFile Android app is now available here:
http://www.hcenteno.net/software/TetraFile_Android_SRC.zip

It contains 3 Eclipse projects: the TetraFile executable, the Java
Android frontend and the fft library used by the executable.

Not included is the source for libsndfile (required by the
executable), which can be found at:
https://bitbucket.org/kunstmusik/libsndfile-android.

I don't think that the changes I made to Tetrafile are worth for Fons
to include in his main code since they are just simple log messages
that are used by the frontend to display the processing progress.

Best,

Hector




On Mon, Jan 27, 2014 at 1:08 PM, Jörn Nettingsmeier
 wrote:
> On 01/26/2014 07:17 PM, Hector Centeno wrote:
>>
>> Hello,
>>
>> I've been always aware that TetraProc (and Tetrafile, which is part of
>> it) is GPL and I can certainly make the source code of my Android app
>> TetraFile available. I just need to find the time to organize it,
>> clean it and package it properly. It consists of two Eclipse projects,
>> one with the Android Java frontend and another with the Tetrafile C++
>> NDK code with some minor modifications I did so I could interface more
>> easily with the frontend.
>
>
> it doesn't need to be cleaned, really, but you need to get that source out
> asap. until you do, you are violating the license, which means you can't
> legally distribute tetrafile for android. or, if your modifications are
> small and self-contained, maybe just feed them back to fons and ask if he's
> interested in adding them to his repo.
>
>
>> Tetrafile depends on libsndfile which would have to be compiled
>> separately for Android but I guess I can include the precompiled
>> library with the Tetrafile NDK project. It took a bit of work to
>> finally get libsndfile working on Android but Steven Yi (a well known
>> Csound contributor) and I managed to get it done. The code for
>> libsndfile is here:
>> https://bitbucket.org/kunstmusik/libsndfile-android
>>
>> As for AmbiExplorer, I didn't use any GPL code in it that would force
>> me to release the source code and for now I would like to keep it
>> closed. I will consider to release it in the near future.
>
>
> oh, sure. i did not mean to imply otherwise, and i respect your choice of
> license.
>
> otoh, i don't think that open-sourcing it would necessarily reduce your
> income from the app - installing something from google play for a few euros
> is just sooo convenient that i'd be very much surprised if more than 1% of
> your prospective customers would rather set up their own build
> environment... (i know i wouldn't - many other open-source apps are marketed
> via google play for reasonable amounts of money, and i always like to
> support people who donate their code to the public.)
>
>
> best,
>
>
> jörn
>
>
>
>
>
>
>
> --
> Jörn Nettingsmeier
> Lortzingstr. 11, 45128 Essen, Tel. +49 177 7937487
>
> Meister für Veranstaltungstechnik (Bühne/Studio)
> Tonmeister VDT
>
> http://stackingdwarves.net
>
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Re: [Sursound] AmbiExplorer

[Hector Centeno]

On Sat, Jan 25, 2014 at 8:57 PM, Jörn Nettingsmeier
 wrote:
> On 01/25/2014 07:27 AM, Hector Centeno wrote:
>
> great, i'll be watching it for updates.
>
> thanks for providing this tool!
>
>
> best,
>
>
>
> jörn
>
>
> btw: i can't seem to find the sources to those tools. i guess at least for
> tetrafile you are legally required to provide them, and i'd appreciate the
> sources for ambiexplorer as well.
>
> that said, i'd still be willing to support
> your efforts by paying the very moderate fee for the ready-to-run app!
>

... and thank you for your supporting good wishes! I do value and
understand the open source principals and supporting people like you
is what it needs.

Hector
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Re: [Sursound] AmbiExplorer

[Hector Centeno]

Hello,

I've been always aware that TetraProc (and Tetrafile, which is part of
it) is GPL and I can certainly make the source code of my Android app
TetraFile available. I just need to find the time to organize it,
clean it and package it properly. It consists of two Eclipse projects,
one with the Android Java frontend and another with the Tetrafile C++
NDK code with some minor modifications I did so I could interface more
easily with the frontend.

Tetrafile depends on libsndfile which would have to be compiled
separately for Android but I guess I can include the precompiled
library with the Tetrafile NDK project. It took a bit of work to
finally get libsndfile working on Android but Steven Yi (a well known
Csound contributor) and I managed to get it done. The code for
libsndfile is here:
https://bitbucket.org/kunstmusik/libsndfile-android

As for AmbiExplorer, I didn't use any GPL code in it that would force
me to release the source code and for now I would like to keep it
closed. I will consider to release it in the near future.

Best,

Hector




On Sun, Jan 26, 2014 at 9:48 AM, Richard Dobson
 wrote:
> On 26/01/2014 13:28, Stefan Schreiber wrote:
> ..
>>
>> I am/was aware that Tetrafile is published under GPL license.
>>
>> But it depends maybe also how Tetrafile is included into the program?
>> (Cos Dalvik-VM/Java and Android development tools are Apache license.)
>>
>
> Not really. They declare themselves that the Apache license is compatible
> with the GPL. Not all licences are.
>
> Cynics call the GPL a "polluting licence" as it requires all the code,
> including that from elsewhere, to be under either the GPL or a compatible
> one - at least, one that is not more restrictive than the GPL itself. So,
> for example, as I understand it, GPL code can be freely combined with code
> that is fully public domain  (free and without any restrictions at all,
> including closed commercial use etc; one example is the Synthesis Toolkit -
> STK, and any amount of code under the BSD licence, which is essentially a
> standard disclaimer of responsibility). So one thing you cannot do is mix
> GPL and closed source and publish only the GPL parts. The point of the GPL
> is not simply to licence individual source files, it is more to ensure any
> user can build their own modified version of the application (which must
> then also be published under the same terms).
>
>
> ..
>>
>> See above. If you argument above is correct, things get quite difficult,
>> because typical Linux toolkit licenses are GPL. (So and according to the
>> argument above, you can't "separate" your code into GPLed and "other
>> license"/closed sections. Even if you try hard to do so.)
>>
>
> Nope, indeed you can't. There is some flexibility regarding libraries (which
> could be under the LGPL; but under the strict proviso that the user can
> relink with a different version of the LGPL library. Some of that depends in
> the LGPL library being dynamically linked, so the user can simply relink the
> binary with it. On the iPhone no dynamic libraries are allowed, so
> everything has to be statically linked, which means in turn that even if it
> is an LGPL library, everything must be made available. If Tetrafile is GPL,
> it cannot be treated as LGPL, and all the sources of any application using
> it needs to be available under that licence.
>
>
> Copyright holders of GPLed software can of course offer alternative non-free
> licences if they choosee to. The classic example is FFTW, which is free
> under the GPL, but is also licensed commercially (e.g. for Matlab). I don't
> think that licence is particularly cheap though!
>
> Richard Dobson
>
>
>
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Re: [Sursound] AmbiExplorer

[Hector Centeno]

Hi Jörn,

Did the reset button return the head or mics to face forward with the
sensors off? The reset button, for now, should only works for when the
sensors are off and the head/mics are being moved manually. Which means
that yes,  for now we will face north :-)

In an upcoming update I'll make the reset button work with the sensors to
reset the soundfield "front" to be in the same direction as the device when
pressed.

Best,

Hector
 On 22 Jan 2014 04:47, "Jörn Nettingsmeier" 
wrote:

> On 01/22/2014 10:15 AM, Michael Chapman wrote:
>
>>
>> Persuaded one of my daughters to download AmbiExplorer  --very impressed
>> with what worked!
>> (The rotatig head is great.)
>>
>> However it does not play.
>>
>> It's a few weeks ago, but IIRC we got a status bar (?) and a clock.
>> Besides getting no sound neither of those two budges.
>> No error messages.
>>
>> It was a SAMSUNG Galaxy SIII mini GT-18190
>> runing Android 4.1.2
>>
>> Any ideas ... ?
>>
>
> funny coincidence, i installed it yesterday night. playing and tracking
> works for me under android 4.4 on an s4. the only thing i could not get to
> work was to reset the listening direction. but hey, it's kind of cool to be
> able to recognize Ambisonics listeners by their facing north at all times :)
>
>
>
>
> --
> Jörn Nettingsmeier
> Lortzingstr. 11, 45128 Essen, Tel. +49 177 7937487
>
> Meister für Veranstaltungstechnik (Bühne/Studio)
> Tonmeister VDT
>
> http://stackingdwarves.net
>
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Re: [Sursound] AmbiExplorer

[Hector Centeno]

Hi Michael,

I'm sorry that AmbiExplorer didn't work on your daughter's device. If
anyone experiences problems with the app please feel free to email me
directly. I'm more than happy to try to figure out what's going wrong. A
downside of Android development is the overwhelming variety of devices and
making apps work on all of them.

On a recent update I added the option of sending bug reports via email for
non-crashing issues like no sound being heard. The best way of doing it is
to close the app by pressing the back button or closing it in the app
switcher. Reopen the app, load a sound file and hit play. If the time
counter doesn't move, press the settings button on the top-right corner and
select "bug report" at the bottom; follow the instructions for sending a
log report via email. If after hitting play the app becomes unresponsive
then wait for the system warning and send a report.

Best regards,

Hector
On 22 Jan 2014 04:16, "Michael Chapman"  wrote:

>
> Persuaded one of my daughters to download AmbiExplorer  --very impressed
> with what worked!
> (The rotatig head is great.)
>
> However it does not play.
>
> It's a few weeks ago, but IIRC we got a status bar (?) and a clock.
> Besides getting no sound neither of those two budges.
> No error messages.
>
> It was a SAMSUNG Galaxy SIII mini GT-18190
> runing Android 4.1.2
>
> Any ideas ... ?
>
> Thanks,
>
> Michael
>
>
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[Sursound] AmbiExplorer and TetraFile apps available now on Google Play

[Hector Centeno]

Hello,

I would like to let you know that my previously announced apps,
AmbiExplorer and TetraFile, have gone live on Google Play. They can be
found here:

https://play.google.com/store/apps/developer?id=Hector%20Centeno&hl=en

Please let me know if you come across any technical problems or if you
have any questions or suggestions. There's a short user guide in the
preferences, accesible through the icon located on the right side of
the action bar (top of the window).

Best regards,

Hector Centeno
www.hcenteno.net
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Re: [Sursound] Upcoming Android apps ambisonic related

[Hector Centeno]

Hello Bo-Erik!

Yes, I hope to have them released before Christmas.

Making a VST out of the AmbiExplorer app would mean reprogramming most
of it because even though Android is built on top of Linux, apps use
lots of Android system specific frameworks. There's also the fact that
it's mostly programmed in Java (not sure if there's an easy way of
making audio plugins in Java) and for a plugin I would more likely
want to use C++. I might anyways consider to  work on it in the near
future, though! Some of the work I've done for this app would
definitively help towards programming a VST version.

Cheers,

Hector


On Tue, Dec 10, 2013 at 10:55 AM, Bo-Erik Sandholm
 wrote:
> Great - Hope we can get them to christmas :-)
>
> They will certainly be available before I have gotten together the remote 
> sensor head control sensors...
>
> Is is a big difference between android and linux apps ? ( Android is a linux 
> with other libraries) could you give us the Ambiexplorer for linux as a vst 
> with control of directions via parameters.
> - Bo-Erik Sandholm
> Stockholm
>
>
> -Original Message-
> From: Sursound [mailto:sursound-boun...@music.vt.edu] On Behalf Of Hector 
> Centeno
> Sent: den 10 december 2013 16:25
> To: sursound@music.vt.edu
> Subject: [Sursound] Upcoming Android apps ambisonic related
>
> Hello all,
>
> I just wanted to share with this list information about two Android apps I've 
> been working on and that I will release soon. I made them because I thought 
> it would be great to be able to listen to ambisonic recordings in a portable 
> way without the need of a full size computer.
>
> The first app is called AmbiExplorer and it's a first order decoder to 
> stereo, with the option of choosing binaural or virtual microphones.
> You can peform soundfield rotation and microphone polar patten selection. It 
> will also work with the device's orientation sensors so you could attach your 
> device to headphones and have head-tracked binaural listening.
>
> The second app is called TetraFile and it's a port of the offline command 
> line utility part of Fons'  TetraProc. I made this so I could connect my 
> portable recorder (in card reader mode) directly to my phone via USB OTG, 
> transfer the A-format files and do a conversion to B-format and listen using 
> AmbiExplorer. It will read your tetrafile calibration files from your phone's 
> storage.
>
> More info and a video demo are available here: 
> http://hcenteno.net/software.html
>
> Any comments are welcome.
>
> Best,
>
> Hector Centeno
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[Sursound] Upcoming Android apps ambisonic related

[Hector Centeno]

Hello all,

I just wanted to share with this list information about two Android
apps I've been working on and that I will release soon. I made them
because I thought it would be great to be able to listen to ambisonic
recordings in a portable way without the need of a full size computer.

The first app is called AmbiExplorer and it's a first order decoder to
stereo, with the option of choosing binaural or virtual microphones.
You can peform soundfield rotation and microphone polar patten
selection. It will also work with the device's orientation sensors so
you could attach your device to headphones and have head-tracked
binaural listening.

The second app is called TetraFile and it's a port of the offline
command line utility part of Fons'  TetraProc. I made this so I could
connect my portable recorder (in card reader mode) directly to my
phone via USB OTG, transfer the A-format files and do a conversion to
B-format and listen using AmbiExplorer. It will read your tetrafile
calibration files from your phone's storage.

More info and a video demo are available here: http://hcenteno.net/software.html

Any comments are welcome.

Best,

Hector Centeno
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Re: [Sursound] Hector bird recording - SoundCloud

[Hector Centeno]

Hello!

Yes, I gave those recordings to Umashankar before I got the microphone
calibrated. I just uploaded a B-format version converted using
Tetraproc and the preset file that Fons made for me after I gave him
my IR measurements. It's not exactly the same fragment but comes from
the same group of recordings. Those birds make indeed very strange
sounds, they are called Urracas in Mexico, were the recording was
done. This is obviously not a pure nature recording since it was done
in the backyard of a house in the city. I placed the mic right under
the tree where the birds were perching.

http://www.hcenteno.net/extras/Urracas_WXYZ.wav.zip

I'll try to get the music recording processed too by tomorrow.

Cheers!

Hector



On Fri, Nov 22, 2013 at 2:41 PM, Eric Benjamin  wrote:
>> Is the W level correct? I am finding myself turning up my W knob 3-6dB
>
> I'm tempted to agree.  Of course it's difficult to be certain.
>
>
> 
>  From: dw 
> To: sursound@music.vt.edu
> Sent: Friday, November 22, 2013 6:21 AM
> Subject: Re: [Sursound] Hector bird recording - SoundCloud
>
>
> On 21/11/2013 19:08, Aaron Heller wrote:
>> I took the liberty of merging them into 4-channel files and putting them on
>> my server, which might be easier to access than the skydive (the UI was in
>> Japanese for me, fortunately I recognized the character for 'down')
>>
>>http://ambisonics.dreamhosters.com/01-Birds_WXYZ-110425_0119.wav
>>http://ambisonics.dreamhosters.com/05-Music_WXYZ-110425_0127.wav
>>
>> They sound quite nice.  In Harpex, you can clearly see the locations of the
>> singers, percussion, and birds.  Impressive!
>>
>> Thanks...
>>
>> Aaron (hel...@ai.sri.com)
>> Menlo Park, CA  US
>>
> Is the W level correct? I am finding myself turning up my W knob 3-6dB
> relative to other recordings before it sounds good..
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Re: [Sursound] Looking for virtual mic equations

[Hector Centeno]

Thank you very much Fons!


On Fri, Jul 19, 2013 at 10:37 AM, Fons Adriaensen wrote:

> On Fri, Jul 19, 2013 at 09:56:40AM -0400, Hector Centeno wrote:
>
> > I'm trying to implement virtual microphones derived from first order
> > ambisonic soundfields using Csound. I was wondering if anyone had any
> > resources to share with equations that would allow me to achieve this,
> > specifying azimuth, elevation and directivity of the mic. I've been
> > analyzing Fons' code for Tetraproc (the Virtmic class) but I'm having
> > difficulties understanding some parts of it (but I'll keep trying). I
> found
> > the paper "Has Ambisonics Come of Age?" by Bruce Wiggins wich contains
> > equations for doing this but it seems that it only takes azimuth angle in
> > consideration.
>
> Given
>
> A = mic direction azimuth
> E = mic direction elevation
> D = directivity, [0...1], 0 = omni, 0.5 = cardioid, 1 = fig-8
>
> and assuming your B-format is FuMA, compute
>
>   cw = sqrt(2) * (1 - D)
>   cx = cos(A) * cos(E) * D
>   cy = sin(A) * cos(E) * D
>   cz = sin(E) * D
>
> and then the output signal for the mic is
>
>   cw * W + cx * X + cy * Y + cz * Z
>
> Ciao,
>
> --
> FA
>
> A world of exhaustive, reliable metadata would be an utopia.
> It's also a pipe-dream, founded on self-delusion, nerd hubris
> and hysterically inflated market opportunities. (Cory Doctorow)
>
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[Sursound] Looking for virtual mic equations

[Hector Centeno]

Hi,

I'm trying to implement virtual microphones derived from first order
ambisonic soundfields using Csound. I was wondering if anyone had any
resources to share with equations that would allow me to achieve this,
specifying azimuth, elevation and directivity of the mic. I've been
analyzing Fons' code for Tetraproc (the Virtmic class) but I'm having
difficulties understanding some parts of it (but I'll keep trying). I found
the paper "Has Ambisonics Come of Age?" by Bruce Wiggins wich contains
equations for doing this but it seems that it only takes azimuth angle in
consideration.

Thanks in advance,

Hector
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Re: [Sursound] a quick tutorial video on how to create an impulse response

[Hector Centeno]

Hello,

This tool set is great, thank you very much. Is there an email or mailing list 
where to ask technical questions related to these Tools? I'm testing it using 
the irreverence~ object for matching microphones and was wondering about the 
reverb effect that I get when using low smoothing values.

Thanks!

Hector


On 2012-12-12, at 9:50 AM, Pierre Alexandre Tremblay  wrote:

> Dear all
> 
> Thanks to Rodrigo Constanzo we have the first video tutorial of how to use 
> and abuse the fruit of the HIRT (the HISS Impulse Response Toolbox). This 
> time round, it is the basic use of capturing an impulse response with some of 
> the tools for MaxMSP.
> 
> Feel free to watch it here:
> 
> https://vimeo.com/55440630
> 
> The paper and all the externals are still available here:
> 
> http://eprints.hud.ac.uk/14897/
> 
> Let us know what you think!
> 
> p
> 
> ps for those who prefer youtube, it will soon be up there too!
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Re: [Sursound] Can anyone explain this ?

[Hector Centeno]

I'm a regular watcher and I have noticed exactly the same! I thought it was 
just some reflections from the room but it's interesting to see someone else 
experiencing it.

Hector  

On 2012-08-07, at 7:09 AM, Richard Dobson  
wrote:

> Re odd things heard: is anyone here a regular watcher of "The Big Bang 
> Theory" show (E4, and on various cable channels)?  There is a standard 
> "sting" (a sort of semi-pitched noise cluster cum whoosh sort of thing, 
> little more than a second in length) used to transition from one scene to the 
> next.  My stereo TV (full HD but otherwise cheap 32" LCD type) is in the 
> corner of my lounge, and is in general not notable at all for significant 
> stereo effects, much less anything more "immersive". Obviously, the built-in 
> speakers (a generous 2 * 6W) are the typical small tinny things.
> 
> However, that sting, fleeting as it is, seems to produce a significant amount 
> of pseudo-surround, very much ~not~ localised to the TV, such that every time 
> it is really rather surprising. One day I will have to record and analyse it, 
> but I haven't got around to that yet. Does anyone have any idea if this is 
> just a random emergent feature of the sound (TV or room artifact), or has 
> that effect been designed into it in some discernible way?
> 
> 
> Richard Dobson
> ..
>> sometimes (depending on content), the result will be surprising, but
>> tricks like these tend to fail on arbitrary content.
>> 
> 
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Re: [Sursound] B-Format to Binaural

[Hector Centeno]

Hello,

I was also wondering what other techniques exist to perform this B-Format to 
binaural conversion other than what I've been already doing: decoding the 
B-Format signal to a virtual 3D speaker array placed using HRTF IRs for each 
speaker location. Are there any ways of going directly from B-Format to 
binaural without doing the virtual speakers?

Best,

Hector


On 2012-04-04, at 4:13 AM, Moritz Fehr wrote:

> Dear List members,
> 
> over the past months, I have been following this group with great interest.
> 
> I would like to ask you if you can give me some advice on converting B-Format 
> recordings to a binaural format for reproducing the spatial impression of my 
> recordings on headphones.
> Mostly, I am recording with a Tetramic. I am looking for useful tools for 
> doing this conversion on a mac.
> 
> Thank you very much,
> Moritz
> 
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Re: [Sursound] Ambisonic-Binaural piece using Brahma mic (was Re: Great responses to my post--thanks!)

[Hector Centeno]

... so I tested loading these 48kHz filters but I get a "Invalid header" error 
in Max/MSP when trying the HRTF files. The coll files work fine. Is there any 
mayor difference between the two that I might be missing? I used a hex editor 
to inspect the header and compared it with a 44.1 file and found that indeed 
there is different info there. Are these for a recent version of Spat? Mine is 
from 2010.

Hector



On 2012-01-13, at 12:50 PM, Hector Centeno wrote:

> Thank you Thibaut, I've been looking for these for long time! I couldn't find 
> them easily in the IRCAM website.
> 
> Cheers,
> 
> Hector
> 
> On 2012-01-13, at 7:47 AM, Thibaut Carpentier wrote:
> 
>> 
>> 
>> Le 13 janv. 2012 à 00:52, Hector Centeno a écrit :
>>> 
>>> I guess I could use a different HRTF measurement to avoid the front/back 
>>> reversal. IRCAM's Spat comes with other impulse SDIF files that are 44.1kHz 
>>> only so I wonder if anyone knows how to resample them to 48kHz, which is 
>>> what I use.
>>> 
>> 
>> 48kHz filters for Spat : 
>> http://echanges.ircam.fr/filez/download.php?ad=239605ZfpX
>> 
>> I do interpolate separately the excess phase part and the magnitude 
>> spectrum, rather than resampling the HRIR.
>> 
>> 
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Re: [Sursound] Ambisonic-Binaural piece using Brahma mic (was Re: Great responses to my post--thanks!)

[Hector Centeno]

Thank you Thibaut, I've been looking for these for long time! I couldn't find 
them easily in the IRCAM website.

Cheers,

Hector

On 2012-01-13, at 7:47 AM, Thibaut Carpentier wrote:

> 
> 
> Le 13 janv. 2012 à 00:52, Hector Centeno a écrit :
>> 
>> I guess I could use a different HRTF measurement to avoid the front/back 
>> reversal. IRCAM's Spat comes with other impulse SDIF files that are 44.1kHz 
>> only so I wonder if anyone knows how to resample them to 48kHz, which is 
>> what I use.
>> 
> 
> 48kHz filters for Spat : 
> http://echanges.ircam.fr/filez/download.php?ad=239605ZfpX
> 
> I do interpolate separately the excess phase part and the magnitude spectrum, 
> rather than resampling the HRIR.
> 
> 
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Re: [Sursound] Ambisonic-Binaural piece using Brahma mic (was Re: Great responses to my post--thanks!)

[Hector Centeno]

Thank you Fons for your comments. What parameters did use for zita-bls1? The 
default ones?

I guess I could use a different HRTF measurement to avoid the front/back 
reversal. IRCAM's Spat comes with other impulse SDIF files that are 44.1kHz 
only so I wonder if anyone knows how to resample them to 48kHz, which is what I 
use.


Cheers,

Hector


On 2012-01-12, at 5:18 AM, Fons Adriaensen wrote:

> On Tue, Jan 10, 2012 at 10:49:12PM -0500, Hector Centeno wrote:
> 
>> Following up on this thread, I just uploaded a soundscape
>> piece I made using the Brahma mic, presented here in a
>> binaural version. The recordings were converted from A
>> to B-Format with Tetraproc (thanks to Fons for the
>> calibrated preset), ambisonic decode with Ambdec (using
>> the extended cube preset extcube-1h1v, which is a regular
>> cube plus speakers on the centre of each face) and then
>> binaurally processed with a Max/MSP patch that uses the
>> IRCAM Spat objects (I also programmed head tracking in
>> this patch). I wonder if using that Ambdec preset would
>> be the best for creating BInarual versions so any comments
>> are welcome.
>> 
>> http://soundcloud.com/hcenteno/world-listening-days-2011
> 
> Nice work ! Usually for me binaural without head tracking
> just produces in-the-head sound. This one is different:
> on headphones everything seems to be _behind_ me ! Except
> for the airplane at the end which appeared where on could
> expect it.
> 
> I also listened on speakers, using zita-bls1 to do the 
> conversion. This worked quite well, producing some scenes
> with an uncanny sense of realism.
> 
> 
> Ciao,
> 
> -- 
> FA
> 
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Re: [Sursound] Ambisonic-Binaural piece using Brahma mic (was Re: Great responses to my post--thanks!)

[Hector Centeno]

Hi Michael,

Yes, I'm aware of that and it's a very nice feature. I also use the VST plugin 
VVMic for ambisonic to stereo conversion which I'm assuming does something 
similar to the stereo output in Tetraproc (virtual mics with adjustable 
polarity and orientation). In this case, of course, I'm attempting full 
periphonic decode into a binaural sound field.

Cheers,

Hector

On 2012-01-11, at 7:37 AM, Michael Chapman wrote:

>> Hi Umashankar (and anyone interested),
>> 
>> Following up on this thread, I just uploaded a soundscape piece I made
>> using the Brahma mic, presented here in a binaural version. The recordings
>> were converted from A to B-Format with Tetraproc (thanks to Fons for the
>> calibrated preset), ambisonic decode with Ambdec (using the extended cube
>> preset extcube-1h1v, which is a regular cube plus speakers on the centre
>> of each face) and then binaurally processed with a Max/MSP patch that uses
>> the IRCAM Spat objects (I also programmed head tracking in this patch).
>> I
>> wonder if using that Ambdec preset would be the best for creating BInarual
>> versions so any comments are welcome.
> 
> You are almost certainly aware that TetraProc offers two channel
> outputs ...
> Fons (some years ago) was quite self-deprecaing about the
> "Xtalk" option. But I appreciated it.
> 
> I certainly use them with success for 'stereo', but have little
> experience with binaural.
> 
> Michael
> 
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[Sursound] Ambisonic-Binaural piece using Brahma mic (was Re: Great responses to my post--thanks!)

[Hector Centeno]

Hi Umashankar (and anyone interested),

Following up on this thread, I just uploaded a soundscape piece I made using 
the Brahma mic, presented here in a binaural version. The recordings were 
converted from A to B-Format with Tetraproc (thanks to Fons for the calibrated 
preset), ambisonic decode with Ambdec (using the extended cube preset 
extcube-1h1v, which is a regular cube plus speakers on the centre of each face) 
and then binaurally processed with a Max/MSP patch that uses the IRCAM Spat 
objects (I also programmed head tracking in this patch). I wonder if using that 
Ambdec preset would be the best for creating BInarual versions so any comments 
are welcome.

http://soundcloud.com/hcenteno/world-listening-days-2011

Cheers!

Hector



On 2011-12-05, at 10:42 AM, umashankar mantravadi wrote:

> 
> dear hector that sounded very good indeed on my sony mdr5 headphones. did you 
> record with brahma? umashankar
> 
> i have published my poems. read (or buy) at http://stores.lulu.com/umashankar
>> Date: Sun, 4 Dec 2011 21:40:26 -0600
>> To: sursound@music.vt.edu
>> From: d...@fugato.com
>> Subject: Re: [Sursound] Great responses to my post--thanks!
>> 
>> At 21:29 04/12/2011, Hector Centeno wrote:
>> 
>>> Here is an example recording I made:
>>> 
>>> http://soundcloud.com/hcenteno/kids-running-in-the-wychwood-barns
>> 
>> Thanks! It sounds good to me played on earbuds...
>> 
>> David
>> 
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Re: [Sursound] Great responses to my post--thanks!

[Hector Centeno]

Hi Umashankar, David and Neil,

Thanks for listening and for sharing your thoughts. No, I didn't use the Brahma 
mic for this one but custom made binaural microphones that I made out of 
mounting omni capsules flush with the outside surface of hard plastic cheap 
headphones. These headphones have a semi-spherical shape. This is a link to a 
pic http://i.seimg.net/images/35777/main/cv160.jpg (I removed the metallic 
grill and made the already present holes underneath bigger to fit the 
capsules). I'm using now a different model mounting the capsules on wooden 
discs that get placed right on the surface of the ear. Some pics of the 
building process here: 
https://picasaweb.google.com/116711693491212900476/BinauralMicrophonesBuilding?authuser=0&feat=directlink
 and a sample recording here: 
http://soundcloud.com/hcenteno/high-park-in-the-summer

David, I'm glad it worked for you using earbuds. I usually like much better how 
they work using over the ear headphones, particularly I find open-back 
headphones give a better image (I use AKG K240).

Neil, yes, as far as I know one of the issues with binaural recordings is that 
the individual experience is not consistent due to physical differences (head 
size, ear shape, etc) to which I guess our brain gets "calibrated" 
acoustically. Seems that the "back-front" swapping is a common issue.


Cheers,

Hector



On 2011-12-05, at 10:42 AM, umashankar mantravadi wrote:

> 
> dear hector that sounded very good indeed on my sony mdr5 headphones. did you 
> record with brahma? umashankar
> 
> i have published my poems. read (or buy) at http://stores.lulu.com/umashankar
>> Date: Sun, 4 Dec 2011 21:40:26 -0600
>> To: sursound@music.vt.edu
>> From: d...@fugato.com
>> Subject: Re: [Sursound] Great responses to my post--thanks!
>> 
>> At 21:29 04/12/2011, Hector Centeno wrote:
>> 
>>> Here is an example recording I made:
>>> 
>>> http://soundcloud.com/hcenteno/kids-running-in-the-wychwood-barns
>> 
>> Thanks! It sounds good to me played on earbuds...
>> 
>> David
>> 
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Re: [Sursound] Great responses to my post--thanks!

[Hector Centeno]

Hello Eric,

Very interesting post. I was a bit intrigued by what you had to say regarding 
binaural recordings and the lack of sense of space. Reproducing a sense of 
space is something that has interested me a lot as a sound artist and I've been 
experimenting with building different types of binaural mics. Here is an 
example recording I made:

http://soundcloud.com/hcenteno/kids-running-in-the-wychwood-barns

If I close my eyes I can really feel the space and the kids running in front of 
me, and not inside my head, but I wonder how would other people perceive it 
(I'm very familiar with the space where this was recorded so I wonder if that 
influences my perception). I've been also experimenting with recordings made 
with a first order mic decoded to stereo binaural with head tracking and indeed 
the sense of space works quite well, although I have to say that not as defined 
as the stereo binaural recordings (which might be a flaw on my process which 
I'm still refining).

Cheers,

Hector


On 2011-11-30, at 1:30 PM, Eric Carmichel wrote:

>  Actually, I've never experienced a sense of “open space” when listening to 
> binaural recordings or simulations from HRTF IRs (including the often-cited 
> IRs made by Gardner et al at MIT during the 1990s). I own ER-3A insert 
> phones, Sennheiser HDA 200 audiometric headphones, and my work-horse AKG K240 
> studio 'phones--but I've yet to hear a binaural recording that replicates 
> live sound--practically everything gives the usual "in-the-head"
> effect or is lateralized (versus localized).

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Re: [Sursound] problem with jconvolver on osx

[Hector Centeno]

Thanks Fons,

I'll wait for the release of zita-convolver 3.0 to continue exploring this.

Cheers,

Hector

On 2011-10-12, at 4:01 AM, Fons Adriaensen wrote:

> On Wed, Oct 12, 2011 at 01:41:41AM -0400, Hector Centeno wrote:
> 
>> I've been looking into an alternative and came across this:
>> 
>> http://sememu.sourceforge.net/
>> 
>> I'm not a C expert so not sure if this could work. I tried to build
>> zita-convolver using this but got errors:
>> 
>> ...
> 
> I've known sememu for some time. The MP** calls could be used, but not
> in the way sememu does it. Anyway they are deprecated so I don't see
> this as a solution. 
> 
> OTOH this could mean that Lion now provides a working alternative.
> If you have the docs or man pages, have a look there.
> 
> In zita-convolver 3.0 the sema implementation is put into
> a separate class which is defined for Linux only. This means
> 3.0 will not compile in OSX unless that class is implemented
> explicitly (instead of compiling fine and then failing at run
> time). You could try doing that using the MP** calls, it should
> be fairly easy. Also 3.0 does not depend on a working get_value().
> 
> Ciao,
> 
> -- 
> FA
> 
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Re: [Sursound] problem with jconvolver on osx

[Hector Centeno]

Hello,

I've been looking into an alternative and came across this:

http://sememu.sourceforge.net/

I'm not a C expert so not sure if this could work. I tried to build
zita-convolver using this but got errors:

./sememu.c:342: warning: ‘MPSignalSemaphore’ is deprecated (declared
at 
/System/Library/Frameworks/CoreServices.framework/Frameworks/CarbonCore.framework/Headers/Multiprocessing.h:725)
In file included from zita-convolver.cc:23:
zita-convolver.h: At global scope:
zita-convolver.h:268: warning: declaration does not declare anything
zita-convolver.cc:315: error: expected unqualified-id before ‘{’ token
make: *** [zita-convolver.o] Error 1

The warning is because I'm on Lion and MPSignalSemaphore has been
deprecated, but I guess still should work. Also sememu is in C and
zita-convolver in C++ so I wonder if that's the issue.

Cheers,

Hector


On Fri, Sep 30, 2011 at 3:38 AM, Fons Adriaensen  wrote:
> *** the zita-convolver library DOES NOT WORK on OSX.***
>
> The reason for this is the crippled implementation of POSIX
> semaphores (sem_t) on OSX:
>
> 1. Only named semaphores (i.e. having a file system name)
>   are available.
>
> 2. The sem_init() function does not work.
>
> 3. The sem_getvalue() function does not work.
>
>
> While (1) is not a final showstopper and there are (clumsy)
> solutions to work around it, (2) and (3) are. Future versions
> of the library will even use more semaphores, so this problem
> is not going away.
>
> The only solution is that some OSX expert/hacker writes a
> complete, correct and efficient version of sem_t, which will
> probably be based on the system's MACH semaphores. It should
> not be difficult at all for someone with the right background.
>
> Ciao,
>
> --
> FA
>
>
>
>
>
>
>
>
>
>
>
>
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Re: [Sursound] problem with jconvolver on osx

[Hector Centeno]

Hello Gregorio,

Some time ago I also tried to make jconvolver work on Mac OS but came
across the same problems as you. My guess is that zitaconvolver is the
culprit. Fons has mentioned that zitaconvolver very unlikely would
work since it uses the POSIX semaphores library which is not
implemented in the same way in the Mac OS environment. Someone has to
port zitaconvolver so it uses the MACH semaphores instead. I've been
trying to look into this but I haven't had the time to research it
enough. Otherwise Fons might be able to give a better guess of why
jconvolver doesn't work.


Cheers,

Hector Centeno

On Thu, Sep 29, 2011 at 7:25 PM, Gregorio Garcia Karman
 wrote:
> Dear Sursounders,
>
> today I built jconvolver on a mac. Config files and impulse responses are 
> loading fine, I can see jconv registered as a jack client and am able to 
> connect and send / receive audio from other applications. But I can't get rid 
> of this problem: audio output from jconvvolver is screwed up and the CPU load 
> is wy too high. This is what I did to install (includes using some of the 
> workarounds proposed in previous posts):
>
> 1. Built clthreads 2.4.0 with Makefile-osx
>
> 2. Create the symbolic links to avoid the warnings and build clxclient 3.6.1
>
> ~$ sudo ln -s /usr/X11R6/lib /usr/X11R6/lib64
> ~$ sudo ln -s /usr/local/lib /usr/local/lib64
> ~$ make -f Makefile-osx
>
> 3. Compile fftw-3.3 with the float option
>
> ~$ ./configure --enable-float
> ~$ make; sudo make install
>
> 4. Make zita-convolver-2.0.0/libs. The changes to Makefile were:
> comment #CPPFLAGS += -march=686
> change option "-soname" to "-dylib_install_name"
> comment #ldconfig
>
> ~$ make -f Makefile-osx
>
> 5. Compile libsndfile-1.0.25. (I was missing x64 libsndfile required by 
> jconvolver)
>
> 6. Compile jconvolver-0.8.7 removing occurrences of "-lrt" from the Makefile
> ~$ make -f Makefile-osx
>
> The BSD version of _install_ does not have the "-D" option so I took care of 
> the permissions / copied the files manually:
> ~$ chmod 755 fconvolver ; chmod 755 jconvolver; chmod 755 makemulti
> ~$ sudo mv makemulti jconvolver fconvolver /usr/local/bin/
>
> 7. Create a symbolic link to libzita-convolver.so.2
> ~$ sudo ln -s /usr/local/lib/libzita-convolver.so.2.0.0 
> /usr/local/lib/libzita-convolver.so.2
>
> After that everything seems well except for a warning that is displayed when 
> starting up jconvolver _Warning: mlockall:: Function not implemented_. 
> Different combinations of jack buffer sizes / partition sizes don't get ri9d 
> of the odd behaviour (i checked that the rest of jack apps behave well). 
> System is OSX 10.6.8 running on an Intel mbp with the 64 bit kernel enabled.
>
> I'm hoping that someone will point out how stupid my mistake is and suggest 
> how to fix it.
> thanks for reading
> my best regards
>
> Gregorio Garcia Karman
> ggkar...@musicologia.com
>
>
>
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Re: [Sursound] Sound Externalization Headphone

[Hector Centeno]

Hi Bo-Erik,

Thanks for your reply. Yes, I considered using the Wii but the
downside is that since it relies on IR, you are constrained to the IR
sensor being in line of sight with the emitter. For visual purposes
where you have to look at a screen in front of you I can see this
working but for ambisonics, being periphonic, I wanted to have the
freedom of turning 360 degrees to explore the soundscape.

Cheers,

Hector


On Thu, May 26, 2011 at 3:11 AM, Bo-Erik Sandholm
 wrote:
>
> Hi
> You seem to have made a very advanced head tracking device,
> Did you ever consider to use wii for head tracking?
> http://rpavlik.github.com/wiimote-head-tracker-gui/
> Wii headtracking in VR Juggler through VRPN
> http://www.xs4all.nl/~wognum/wii/
>
> http://www.wiimoteproject.com/
>
> Regards
> Bo-Erik
>
>
>
>
> -Original Message-
> From: sursound-boun...@music.vt.edu [mailto:sursound-boun...@music.vt.edu] On 
> Behalf Of Hector Centeno
> Sent: den 25 maj 2011 23:15
> To: Surround Sound discussion group
> Subject: Re: [Sursound] Sound Externalization Headphone
>
> Exactly what I've been exploring using ambisonic recordings from a 
> tetrahedral mic. I've been decoding to fixed HRTFs corresponding to virtual 
> speakers in a cube configuration. Good to know who was doing it and when was 
> already being done. I also made a head-tracking sensor using an 
> accelerometer, gyroscope and magnetometer controlled by an Arduino Pro Mini:
>
> http://vimeo.com/22727528
>
> Cheers,
>
> Hector
>
> On Wed, May 25, 2011 at 4:06 AM, Dave Malham  wrote:
>>
>>
>> On 24/05/2011 20:00, f...@libero.it wrote:
>>>
>>> 
>>>
>>> I should mention that interpolation of HRTF is not the only possible
>>> technique; you can use for example a virtual loudspeaker array...
>>>
>> This is certainly the way that the Lake DSP system worked that they
>> demonstrated way back in 1993 (I think it's in the papers for the
>> London
>> VR93 confence from that year but I don't have my copy of the
>> proceedings hand). The sounds were recorded in (first order)
>> Ambisonics and the head tracking drove a rotate/tilt algorithme that
>> fed a decoder to virtual speakers the signals from which were
>> convolved with fixed hrtf's corresponding to the speakers' positions
>> that were fixed wrt the head, mixed together and fed to the headphones.
>>
>>
>>                  Dave
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Re: [Sursound] Sound Externalization Headphone

[Hector Centeno]

Exactly what I've been exploring using ambisonic recordings from a
tetrahedral mic. I've been decoding to fixed HRTFs corresponding to
virtual speakers in a cube configuration. Good to know who was doing
it and when was already being done. I also made a head-tracking sensor
using an accelerometer, gyroscope and magnetometer controlled by an
Arduino Pro Mini:

http://vimeo.com/22727528

Cheers,

Hector

On Wed, May 25, 2011 at 4:06 AM, Dave Malham  wrote:
>
>
> On 24/05/2011 20:00, f...@libero.it wrote:
>>
>> 
>>
>> I should mention that interpolation of HRTF is not the only possible
>> technique; you can use for example a virtual loudspeaker array...
>>
> This is certainly the way that the Lake DSP system worked that they
> demonstrated way back in 1993 (I think it's in the papers for the London
> VR93 confence from that year but I don't have my copy of the proceedings
> hand). The sounds were recorded in (first order) Ambisonics and the head
> tracking drove a rotate/tilt algorithme that fed a decoder to virtual
> speakers the signals from which were convolved with fixed hrtf's
> corresponding to the speakers' positions that were fixed wrt the head, mixed
> together and fed to the headphones.
>
>
>                  Dave
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Re: [Sursound] Brahma mic users?

[Hector Centeno]

Hello Michael and Umashankar,

Yes, I've been doing some recordings with it and I'm liking the
results. Later today I can upload some of them and post the links here
for you to listen. Do you prefer the raw A-format or the B-format
conversion? For the B-Format conversion I've been using TetraProc
without any calibration files and using the default "theoretical mic"
preset. I can also upload binaural versions of those recordings.

I did try to match the levels of the four capsules by recording twice
a test signal, first with the "front" and then with the "back" side of
the mic facing the speaker. Then I matched the gains of all four
capsules using this recorded test signals and applied the same gain
compensations to the recordings. This is probably not the best
procedure but it seemed to improve the results, particularly the
general balance of the soundfield.

I recently did some IR measurements and sent them to Fons who is
kindly helping me making the calibration files for TetraProc. Once I
get those I can later upload the same recordings but now calibrated
for comparison.

Cheers,

Hector



On Tue, May 17, 2011 at 10:19 PM, umashankar mantravadi
 wrote:
>
> dear michael
>
> i do not mind at all, and would in fact like to hear from people who have 
> used my mic, or heard recordings made with it.
>
> Angelo has ten of them, and a 11th made with TSB 120 capsules which he has 
> tested and calibrated and used for recordings. i have not heard these 
> recordings myself.
>
> one member of this group, hector centano, has a brahma and i heard nice 
> sounding recordings he has made with it.
>
> the first thing i must point out if you want to buy a brahma is you will have 
> to calibrate the microphone yourself. at the moment i am not set up for doing 
> this. (hector and i have both used them uncalibrated, with a kind of best fit 
> approach). depending on your skill levels and parts availability, you can 
> build it yourself (using the required parts from shapeways), do only the zoom 
> modification yourself, or get me to make the whole thing. (we can discuss 
> that off list)
>
>
> umashankar
>
> i have published my poems. read (or buy) at http://stores.lulu.com/umashankar
>
>
>
>> Date: Wed, 18 May 2011 07:06:33 +0900
>> From: loop...@gmail.com
>> To: sursound@music.vt.edu
>> Subject: [Sursound] Brahma mic users?
>>
>> Hi,
>>
>> I've been on this list a while and not posted anything, mainly because
>> I find I have little to add to the usually on-topic and interesting
>> exchanges that go on here. However, I'm soon to be in the market for
>> an A-format/soundfield microphone. My budget is limited, so this means
>> either the Tetramic or Brahma mic/kit appear to be my only options.
>> While I can find plenty of testimony regarding the Tetramic's
>> strengths and weaknesses, there seems to have been little or no
>> discussion of Umashankar's Brahma. Have any list member's had
>> experience with this mic? In terms of cost, it seems like a very
>> attractive package to begin recording ambisonic material.
>>
>> thanks
>>
>> Michael Noble
>>
>> ps. I realize Umashankar, you are a list member. I hope you are not
>> offended that I should seek third party input before inquiring to you
>> directly about your products.
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Re: [Sursound] looking for ambisonic field recordings

[Hector Centeno]

Thanks everyone! I'm looking for test material for an installation
project and this will be more than enough.

Cheers,

Hector

On Tue, May 17, 2011 at 3:37 AM, Paul Hodges  wrote:
> Many of my recordings from Ambisonia are accessible here:
>        
> along with some by John Leonard, by his kind permission.
>
> More will be linked shortly (they are all in place waiting for the links) -
> I had hoped to have them all, mine and John's, that is, fully accessible by
> now, but some major changes at work have seriously interfered with my time
> and distraction levels over the last couple of months.  The files concerned
> are all hosted on Amazon S3 for fast downloads.
>
> Paul
>
> --
> Paul Hodges
>
>
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[Sursound] looking for ambisonic field recordings

[Hector Centeno]

Hi,

Since ambisonia.com is gone I was wondering if anyone knows of a site
where to download sample recordings made using with any of the
commercially available tetrahedral mics, A-format or B-format. I'm
looking for field recordings particularly (soundscapes) and not music.

Thanks!

Hector
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Re: [Sursound] HARPEX-B Plus First Order Mic vs. Third Order

[Hector Centeno]

Fons' Tetraproc for A-B conversion works on Mac OSX too (needs to be
compiled by hand, though) and I believe he can give you the
calibration files if you provide the serial number of your TetraMic.

Best,

Hector


On Thu, Apr 7, 2011 at 8:04 AM, John Leonard  wrote:
> I've been using the TetraMic happily in OSX for a while now. Initially in 
> Bidule, where all the software worked well, and lately in Nuendo, where the 
> latest version of the software also works well. At the moment, I'm listening 
> to a recording of a Jonathan Dove mini-opera called Seven Angels made with 
> the TetraMic and being decoded using VVTetraVST and Harpex-B in 5.1 surround. 
> The mic was close to the edge of the stage with the two performers in front, 
> and Hugh Webb, the harpist, effectively behind and to the left of the 
> microphone. The sense of space and image is startlingly good.
>
> I spent quite a bit of last Sunday in Manhattan with a DR-680 and a TetraMic 
> making location recordings which are also excellent. I agree that the 
> non-appearance of the 4-Mic processor was disappointing, but I also know and 
> understand how it came about and I'm sure Len will be happy to tell you as 
> well.
>
> Regards,
>
> John
>
> On 7 Apr 2011, at 11:39, Brian C. Peters wrote:
>
>> I've been waiting two years or more for your mic to become usable in OSX
>
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Re: [Sursound] HARPEX-B Plus First Order Mic vs. Third Order

[Hector Centeno]

Hello,

Not related to a comparison with a third order mic but related to
directional cues: I did a quick check using the demo plugin decoding
some tetrahedral mic recordings to binaural. I loaded it into a
Max/MSP patch and did A-B comparisons between two combos consisting of
Tetraproc-Harpex and Tetraproc-Ambdec-SPAT (SPAT for the binaural
virtual speakers). To my ears, this comparison revealed that
directionality was much precise and clear with the TAS combo than with
Harpex. This was particularly noticeable with a recording of birds
singing from tree branches located above the mic. With Harpex some of
the bird calls would jump around spatially as the spectral content of
the call changed whereas with TAS it remained focused and well
localized within a discernible location. I haven't done a test
decoding over speakers so I'm not sure if this would be only related
to binaural decoding.

Best,

Hector Centeno

On Wed, Apr 6, 2011 at 2:06 PM, Len Moskowitz
 wrote:
> I've been playing with Svein's player.  It looks and sounds good.
>
> One claim he's making is that his parametric decoding method allows a
> first-order soundfield microphone (like our TetraMic) to provide direction
> cues that are equal to or better that what's available from a third-order
> soundfield microphone.  Also, presumably the "sweet spot" is comparable
> in size to the one we'd expect from a third-order microphone.
>
> If you've been using the HARPEX-B player or plug-in, do you think the claims
> are reasonable?
>
>
> Len Moskowitz (mosko...@core-sound.com)
>
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Re: [Sursound] Exciting news anyone?

[Hector Centeno]

Congratulations! I was looking forward to this release after trying
the online conversion. Any chance there will be a non-commercial price
(I'm a sound artist, not a commercial producer)? It feels a bit unfair
to me that something like this gets focused only on main stream
commercial production when it could be a great tool for artists.
Paying for this plugin would be way more than what I paid for my DAW
(Reaper) and my b-format mic (custom made) all together. Or maybe a
pricing Reaper style where you pay according to how much your yearly
revenue is? Just a thought.

Cheers,

Hector


On Fri, Apr 1, 2011 at 1:33 PM, Trond Lossius  wrote:
> On Apr 1, 2011, at 11:37 AM, Svein Berge wrote:
>
>> 5. counter-productively expensive (compared to Reaper or Plogue)
>>
>> As you all know, the marginal cost of software is close to zero, everything 
>> is in the development. So, when you compare a specialized product to a 
>> mass-market product, it makes no logical sense to compare their feature set 
>> without at the same time dividing by the potential sales numbers. It should 
>> be noted that I am not paid by anyone to do this work, so the business model 
>> here is that the users must pay for all of the development. Since this 
>> plugin in practice requires the use of a soundfield-type microphone, which 
>> is not really a mass-market product, I don't expect to recoup any reasonable 
>> wage for the time spent on it. From a customer's point of view, the price 
>> should be considered in relation to the cost of all the other gear involved 
>> - the microphone, recorder, computer, daw etc and the relative value added 
>> by the plugin. I think it's a good deal, but don't expect much sympathy from 
>> academia.
>
> I don't know enough regarding software sales and pricing strategies to have 
> any clear opinion on what's the right price to eventually cover the 
> development costs. The reasoning above seems sensible, but is assuming that 
> the same person/organization owns and use the mic, recording hardware and 
> equipment/software for playback. That might not always be the case.
>
> I'm working at BEK, a media lab for artists in Bergen (NO). We have a 
> SoundField mic and it's getting increasingly popular among local artists. 
> Depending on the project they often get to borrow it and the hard disc 
> recorder for free (or almost free). For many of them it will be interesting 
> to be able to use Harpex for decoding later on. While BEK itself can and 
> probably will get a plug-in license, I'm less sure how many of the artists we 
> work with that will be able to afford it. On the other hand it might well be 
> that they can do decoding when required at the BEK studio, and thus won't 
> depend on having their own license.
>
> Just my 5 cents. I've set aside a full day at the study next week to try it 
> out. Natasha Barrett has been very enthusiastic about Harpex, so I'm looking 
> forward to playing with it.
>
> Best,
> Trond
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[Sursound] ambdec 0.4.4 package for Mac OS X 10.6 available

[Hector Centeno]

Hello,

As I mentioned earlier, I was working on packaging ambdec for Mac OS
X. I've got it done and tested but for now it will only work on 10.6
(Snow Leopard). As soon as I get to compile it for 32 bits I'll post
another installer for Mac OS 10.5.

The installer will put ambdec in /usr/local/bin, libraries in
/usr/local/lib (as the original installer would do) and the presets in
/usr/local/share/ambdec_presets. I also made a launcher that is
installed in your Applications folder together with the presets (all
in a folder named ambdec) for those who don't want to use a terminal.
If you rather start ambdec from a terminal then during the
installation you can select to customize the install and deselect the
launcher.

You should have X11 installed (usually there by default, check in your
/Applications/Utilities folder) and also JacOSX (the dual 32/64 bits
version for Mac OS 10.6). Jack should be started before running ambdec
and X11 will start automatically when you start ambdec.

The only know issue using the launcher is that the system doesn't
detect that ambdec has started so the ambdec icon won't stay in the
dock (it will disappear after bouncing for a little while, without
affecting ambdec), I'll try to fix this for a second version of the
installer.

You can download the installer here:
http://www.hcenteno.net/software/ambdec_0.4.4.pkg

Please let me know of any issues with this installer. I hope this is
helpful to others.

Best,

Hector Centeno
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Re: [Sursound] Ambisonics max/MSP 8 speakers - ICST Ambisonic Externals

[Hector Centeno]

Hello Darren,

You can download the package I made for ambdec here:
http://www.hcenteno.net/extras/ambdec_0.4.2.pkg

You require JackOSX ( www.jackosx.com ) and X11 (this last one should
be already installed if you have OS X 10.5 or above).

I also made a launcher that will be installed in your applications
directory, in a folder containing both the launcher app and the ambdec
presets.

I haven't fully tested this installer so please let me know if you
encounter any problems.

Best,

Hector Centeno

p.s. I don't have bidule so I've not tested those ambisonic bidules.
I'll keep it in mind for when I get a chance.

On Mon, Mar 21, 2011 at 9:44 AM, Darren - Bradley
 wrote:
> Thanks I would like to download the OS X  version when you have done it
>
> I sent you an email hopefully you got it otherwise please forward it onto me
> when you have done it,
>
> many thanks
>
> also what you think of  - Ambisonic Bidules   -
> http://www.digenis.co.uk/?page_id=59 ?
>
> cheers
> Darren
>
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Re: [Sursound] Ambisonics max/MSP 8 speakers - ICST Ambisonic Externals

[Hector Centeno]

OK. I made an installer for ambdec for Mac OS X. Please feel free to
contact me off-list if anyone needs it. It's not tested but I think it
should work. The only problem might be that I missed a shared library,
which I can fix. JackOSX is required.

Best,

Hector

Note to Fons: I took care of adding a note saying that no
responsibility or technical support will be expected from you
regarding this package.



On Sun, Mar 20, 2011 at 2:45 PM, Hector Centeno  wrote:
> Hello Darren,
>
> I second jörn, ambdec is the way to go. I've just recently tested it
> against ambidecode~ and IRCAM's spat.decoder~ object and I found
> ambdec to produce a much better result overall. I've compiled it under
> Mac OSX 10.6.6 but I remember having to tweak something in the make
> file for ambdec or maybe one of the needed libraries. I could try to
> build a package later today or tomorrow.
>
> Best,
>
> Hector
>
>
> 2011/3/20 Jörn Nettingsmeier :
>> On 03/20/2011 06:03 PM, Darren - Bradley wrote:
>>>
>>> Darren here,
>>>
>>> thanks for all your help, much appreciated.
>>>
>>> I have consulted my friends and we think maybe a 8 speaker setup is best
>>> for our audience we are going to perform from 40 to 300 people
>>>
>>> We are looking at now using max/MSP with 8 speakers and using routing of
>>> 4 sends in different panning postions from 'LIVE' to max/MSP.
>>>
>>> Does any one have a good patch for max/MSP or is the help file
>>> ambiencode~ and ambidecode~ enough taken from - icst website >
>>> Ambisonics Externals for MaxMSP " and would this be best to use.
>>
>> if you're using mac os, i'd recommend you try fons' ambdec decoder. not too
>> hard to build for osx, and maybe someone here has already created a package
>> they might be willing to share?
>>
>> it outperforms other decoders i've heard, and it's quite easy to use. there
>> is a preset for third-order octagons, and all you need to change are the
>> speaker distances. you really want to use third-order panning.
>>
>> best,
>>
>> jörn
>>
>>
>>
>> --
>> Jörn Nettingsmeier
>> Lortzingstr. 11, 45128 Essen, Tel. +49 177 7937487
>>
>> Meister für Veranstaltungstechnik (Bühne/Studio)
>> Tonmeister VDT
>>
>> http://stackingdwarves.net
>>
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>>
>
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Re: [Sursound] Ambisonics max/MSP 8 speakers - ICST Ambisonic Externals

[Hector Centeno]

Hello Darren,

I second jörn, ambdec is the way to go. I've just recently tested it
against ambidecode~ and IRCAM's spat.decoder~ object and I found
ambdec to produce a much better result overall. I've compiled it under
Mac OSX 10.6.6 but I remember having to tweak something in the make
file for ambdec or maybe one of the needed libraries. I could try to
build a package later today or tomorrow.

Best,

Hector


2011/3/20 Jörn Nettingsmeier :
> On 03/20/2011 06:03 PM, Darren - Bradley wrote:
>>
>> Darren here,
>>
>> thanks for all your help, much appreciated.
>>
>> I have consulted my friends and we think maybe a 8 speaker setup is best
>> for our audience we are going to perform from 40 to 300 people
>>
>> We are looking at now using max/MSP with 8 speakers and using routing of
>> 4 sends in different panning postions from 'LIVE' to max/MSP.
>>
>> Does any one have a good patch for max/MSP or is the help file
>> ambiencode~ and ambidecode~ enough taken from - icst website >
>> Ambisonics Externals for MaxMSP " and would this be best to use.
>
> if you're using mac os, i'd recommend you try fons' ambdec decoder. not too
> hard to build for osx, and maybe someone here has already created a package
> they might be willing to share?
>
> it outperforms other decoders i've heard, and it's quite easy to use. there
> is a preset for third-order octagons, and all you need to change are the
> speaker distances. you really want to use third-order panning.
>
> best,
>
> jörn
>
>
>
> --
> Jörn Nettingsmeier
> Lortzingstr. 11, 45128 Essen, Tel. +49 177 7937487
>
> Meister für Veranstaltungstechnik (Bühne/Studio)
> Tonmeister VDT
>
> http://stackingdwarves.net
>
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>
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Re: [Sursound] HRTF Database

[Hector Centeno]

Hello,

I was wondering if anyone knows if these MATLAB HRTF files can be
found as IR audio files somewhere. I won't be buying MATLAB and I
would like to try them using a convolution plugin or a MAX/Msp patch.

Regards,

Hector Centeno


On Tue, Mar 15, 2011 at 12:56 PM, Len Moskowitz
 wrote:
> Perhaps folks here will find this useful:
>
> http://interface.cipic.ucdavis.edu/sound/hrtf.html
>
> CIPIC HRTF Database
>
> The CIPIC HRTF Database is a public-domain database of
> high-spatial-resolution HRTF measurements for 45 different subjects,
> including the KEMAR mannequin with both small and large pinnae.
>
> The database includes 2,500 measurements of head-related impulse responses
> for each subject. These "standard" measurements were recorded at 25
> different interaural-polar azimuths and 50 different interaural-polar
> elevations. Additional "special" measurements of the KEMAR manikin were made
> for the frontal and horizontal planes. In addition, the database includes
> anthropometric measurements for use in HRTF scaling studies, technical
> documentation, and a utility program for displaying and inspecting the data.
> Accessing the data requires MATLAB 5x or greater. Additional details are
> given in the following paper:
>
> V. R. Algazi, R. O. Duda, D. M. Thompson and C. Avendano, "The CIPIC HRTF
> Database," Proc. 2001 IEEE Workshop on Applications of Signal Processing to
> Audio and Electroacoustics, pp. 99-102, Mohonk Mountain House, New Paltz,
> NY, Oct. 21-24, 2001.
>
>
>
> Len Moskowitz (mosko...@core-sound.com)
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Re: [Sursound] cross-talk cancellation used in binaural sound

[Hector Centeno]

Hello,

I'm one of those folks, although I hope I'm doing it well. I've been
doing some initial tests for an installation that uses ambisonic
recordings done with a tetrahedral mic. The B-format signal is then
decoded and played over headphones using virtual speakers panned
binaurally. I'm also adding a head-tracking device consisting of an
iPod Touch running an app that sends the gyroscope orientation to a
Max/MSP patch for altering the pitch and yaw of the B-format signal
before it's decoded. The localization is far from perfect and not as
accurate as  with pure binaural recordings but I'm very happy with the
results. Also I have yet to further calibrate the mic which will very
likely improve the image.

Cheers,

Hector

On Mon, Mar 14, 2011 at 1:23 PM, Len Moskowitz
 wrote:
> Ralph Glasgal wrote:
>
>> It is virtually impossible to get?360 degrees (including height) via
>> earphones.
>
> Add head tracking and it's possible.  Some folks have been doing that well
> for quite some time.
>
>
> Len Moskowitz (mosko...@core-sound.com)
>
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