[Sursound] Call for papers: IEEE Multimedia Signal Processing 2019

(Apologies for cross-posting) Call for papers: Special session on Computational Audio Intelligence for Immersive Applications IEEE 21st International Workshop on Multimedia Signal Processing (MMSP) 2019. Special session website: https://dr-costas.github.io/caiia-mmsp2019/

Re: [Sursound] Enquiry on upmixing from 1st order ambisonics to 3rd order ambisonics.

Hi David, These upmixing methods extract a lot of information from the FOA recording that is then re-used to essentially “synthesize" the HOA signals, with a spatial resolution that would not be possible with the FOA recordings. They are “active” in that sense, and signal-dependent, compared

Re: [Sursound] Enquiry on upmixing from 1st order ambisonics to 3rd order ambisonics.

Hi Steven, As far as I remember the Rode plugin does not offer this functionality (upmixing FOA to HOA). Regards, Archontis Politis On 22 Feb 2019, at 14:04, Steven Boardman mailto:boardroomout...@gmail.com>> wrote: And lets not forget ‘Soundfield’ by Rode. This also uses some form of

Re: [Sursound] Enquiry on upmixing from 1st order ambisonics to 3rd order ambisonics.

>> wrote: To add on top of the previous email, there are three then ( I didn t know about COMPASS), because Harpex can be a vst itself, which sounds magnificently good. Regards Axel On Fri, 22 Feb 2019 at 07:52, Politis Archontis mailto:archontis.poli...@aalto.fi>> wrote: Hi Wilson,

Re: [Sursound] Enquiry on upmixing from 1st order ambisonics to 3rd order ambisonics.

Hi Wilson, First of all you have to understand the upmixing algorithms themselves before starting implementing them. Some methods that can do that are Directional Audio Coding (DirAC), which you can read all about in the “Parametric Time-frequency Domain Spatial Audio” book of last year, and

Re: [Sursound] Sursound Digest, Vol 126, Issue 14

subscribers. the community and list subscribers care about the integrity of the threads and archives so this is important. Today's Topics: 1. Re: Impressive transaural demo (Marc Lavall?e) 2. Re: Impressive transaural demo (Ralph Glasgal) 3. Announcin

[Sursound] Announcing COMPASS decoder VST plugin

Hello, we made available today a VST plugin implementation of a parametric ambisonic decoder based on the COMPASS model, published last year at IEEE ICASSP2018 (https://ieeexplore.ieee.org/abstract/document/8462608, also on ResearchGate). The decoder works with first-, second-, and third-order

Re: [Sursound] Publishing music in ambisonics

> On 13 Jan 2019, at 22:08, Bo-Erik Sandholm wrote: > > Angelo Farina has created a metadata "injector" to make ambisonic work in > VLC. > I think he described it it a posting in the ambisonic 360 VR audio facebook > group Actually, the standard “spatial media metadata” injector provided by

Re: [Sursound] Publishing music in ambisonics

Hi Marc, I believe it expects the “spatial media” metadata to be written in the file for VLC to interpret it as ambisonic. It worked for me in the past. Yes, it’s a shame that it is completely undocumented, especially since it was advertised as one of the cool new features of VLC 3. The

Re: [Sursound] Publishing music in ambisonics

Hi, In JSAmbisonics online demos we have an example that decodes to 8 speakers, working in Chrome with success. I remember we had some problem getting output for more channels out at that time, but that was a year ago and things may have changed in Web-Audio. In general, the library supports

Re: [Sursound] Soundfield by Rode plugin

Hi, There are various ways to do it, one is to assume a sound-field model (e.g. direct & diffuse sound), estimate the model parameters in each frequency bin, and then use them to align the signals in a coincident way, such a parametric approach was presented by us in AES Convention in Milan

Re: [Sursound] Looking for JavaScript compatible AmbiX / FuMa player

Hi Matt, We have the open-source JSAmbisonics library that supports first and higher-order Ambisonics, Fuma or ambiX, and you can find in the code examples one that polls your phone’s orientation and uses it to rotate 360 video and the ambisonic soundfield. It may be what you are looking for

Re: [Sursound] RIR measuring, how to capture a higher order Ambisonic room responce?

By the way one could actually use only one microphone, measure the RIR, rotate it to another point, repeat the measurement, and make a virtual array of hundreds or thousands of points for high-order RIR recording. This has actually been done and the work published by Boaz Rafaely and his

Re: [Sursound] RIR measuring, how to capture a higher order Ambisonic room responce?

Hi Bo-Erik, if you use Matlab or Octave, you could also try the SDM method to upsample from first-order RIRs to 2nd, 3rd, or any order you want basically. SDM stands for the Spatial Decomposition Method from my colleague Sakari Tervo, which has been used quite a lot for auralization and

Re: [Sursound] Mosca: GUI assisted ambisonics quark v0.2 for SuperCollider

Hi Bo-Erik, Just a small correction :-) - this is Archontis from Ville Pulkki’s group here in Aalto University, I think you meant Antti Vanne from IDA for personalized HRTFs (unless there is another spatial audio Pulkki here in Finland with the name Antti, offering also personalized HRTFs :-).

Re: [Sursound] Individualized HRTFs (Augustine Leudar)

t 12:00, Augustine Leudar <augustineleu...@gmail.com> wrote: > > Does it measure ITDs and ILDs as well or just the Pinna ? I would like to > try it anyway - but retain slight skepticism for now.. > > On 23 November 2017 at 09:50, Politis Archontis <archontis.poli...@aal

Re: [Sursound] Individualized HRTFs (Augustine Leudar)

Hi Gernot, I haven’t used the toolkit, but I don’t see the reason for HRTF interpolation in a predefined grid - if you generate the spherical harmonic filters for whatever HRTF set you have without interpolation, then all you need in AmbiX is a binaural decoding configuration file with a

Re: [Sursound] Virtual Microphone Processors for HOA?

Hi Stefan, On 12 Oct 2017, at 02:50, Stefan Schreiber > wrote: Omnitone offers ambisonic decoding and binaural rendering of: * First-order-ambisonic stream * High-order-ambisonic stream: 2nd and 3rd order. The input audio stream can

Re: [Sursound] Virtual Microphone Processors for HOA?

Hi Len, you can find a higher-order virtual microphone implementation in our web-audio ambisonics library, implementing higher-order cardioids, supercardioids, and hypercardioid patterns. The library is open-source and generates the patterns for any order, even though Web Audio supports up to

Re: [Sursound] Songbird

Hi Martin, Interesting! Taking a closer look it seems like it’s an intermediate library to ease integrating ambisonic encoding to VR, or game scenes, and applying also some environmental effects (reverberation). The actual ambisonic processing is still handled by their Omnitone library.

Re: [Sursound] multichannel VST recorder os x

Hi Oliver, A bit curious here, I’m not aware of any such VST, but isn’t the multichannel recording usually a task for the host DAW or sample editor etc. ? For example Reaper does super easy multichannel recording on OSX for up to 64ch on a single bus, if I remember correctly. Regards,

Re: [Sursound] Sonicam

e even 18kHz? Am I correct in assuming that the distance between the capsules needs to be less than half the highest wavelength represented? Best Steve On 27 May 2017, at 23:18, Politis Archontis <archontis.poli...@aalto.fi<mailto:archontis.poli...@aalto.fi>> wrote: Hi Stev

Re: [Sursound] Sonicam

Hi Steven, as Fons mentioned before such an array will have trouble to deliver proper HOA components at a useful range. Running a simple simulation here for R=17cm and assuming perfect matched microphones and perfectly (uniformly) arranged, spatial aliasing starts to become serious at 4.5kHz.

[Sursound] VBAP and Ambisonics [was: The BBC & Quadrophony in 1973]

Hi Sampo, > On 09 Jan 2017, at 06:27, Sampo Syreeni wrote: > > The critique I'd have for such panning laws is that they don't really respect > the ambisonic/Gerzon theory, especially at the low frequencies. In essence, > they work, and necessarily would *have* to work in the

Re: [Sursound] [allowed] brahma

Hello and a happy new year to the list, just to mention some more resources on this topic: part of the open-source Matlab libraries I made public last year deals with this matter: deriving the matrix of filters form the microphone to the B-format signals, FOA or HOA. The filters can be

[Sursound] Ambisonics on the web pt.1: JSAmbisonics library update

Hello, for those who are interested in ambisonic processing on the web (outside of Facebook and Youtube 360 playback), this is an update on the JSAmbisonics library of Web Audio objects for first- (FOA) and higher-order (HOA) processing: https://github.com/polarch/JSAmbisonics Compared to

Re: [Sursound] Blue Ripple Sound & SN3D?

+1 for (S)N3D / ACN. To us newbies, as Fons mentioned :-), FuMa makes sense only for 1st-order, and then it is trivial to convert to the above if needed. Best, Archontis On Aug 10, 2016, at 1:53 PM, Richard Furse wrote: > Hi there! > > > > Blue Ripple Sound are

Re: [Sursound] Merging impulse responces, is it workable?

Hi Bo-Erik, you should first convolve each sound source sample with its respective B-format RIR, then sum the resulting B-format streams. Do not merge the RIRs before, it won't give you the result you are looking for. What you can do however is, if you have an indication of mixing time of the

Re: [Sursound] Conversion from FOA to TOA ? How to and why or not?

016, at 21:23, Stefan Schreiber <st...@mail.telepac.pt> wrote: > > Politis Archontis wrote: > >> >> We start by setting up a large dense 3D loudspeaker setup in a fully >> anechoic chamber (usually between 25~35 speakers at a distance of ~2.5m), so >&g

Re: [Sursound] Conversion from FOA to TOA ? How to and why or not?

> On 01 Jul 2016, at 18:50, Justin Bennett wrote: > > > that’s interesting to hear, Trond, I was also wondering about how upsampling > would affect the reproduction of field recordings. > > best, Justin > Hi Justin, To my experience, parametric methods such as Harpex

Re: [Sursound] Ambisonics on the web pt.1: Web Audio FOA/HOA ambisonic objects

Hi, just a note that I replaced the binaural decoding filters in the examples with others that fix most of the decoding colouration issues that were very strong in the first version. I‘ve also added some Matlab routines that can show how these filters can be computes from an HRTF set, with

Re: [Sursound] Ambisonics on the web pt.1: Web Audio FOA/HOA ambisonic objects

don’t have to go into the details, channels, normalization etc.) ? Archontis > On 21 Jun 2016, at 00:14, Courville, Daniel <courville.dan...@uqam.ca> wrote: > > Politis Archontis wrote: > >> Good point, I?ll add some clarification in the dcumentation that whenever I &g

Re: [Sursound] Ambisonics on the web pt.1: Web Audio FOA/HOA ambisonic objects

Hi Daniel, > On 19 Jun 2016, at 19:21, Courville, Daniel <courville.dan...@uqam.ca> wrote: > > Politis Archontis wrote: > >> https://github.com/polarch/JSAmbisonics >> - WebAudio_FOA.js: Implements B-format encoding, rotations, virtual >> microphones, acous

[Sursound] Ambisonics on the web pt.1: Web Audio FOA/HOA ambisonic objects

Hi, I thought this may be of interest to some - I finally found some time to organize some code for real-time ambisonic spatialization and binaural decoding on the browser, using the Web Audio API and JavaScript. I just published the code in Github, you can find it at:

Re: [Sursound] Using Ambisonic for a live streaming VR project

Hi Jörn, On 03 Jun 2016, at 15:27, Jörn Nettingsmeier > wrote: Note however that while the quality of first-order to binaural is quite good because the listener is by definition always in the sweet spot, first-order over

Re: [Sursound] Using Ambisonic for a live streaming VR project

Hi Antoine, I don't know of any out-of-the-box solutions for that, maybe other people on the list do, but a DiY solution is to use one of the audio programming environments that can stream audio, and they have modules for ambisonic decoding and rotation. Puredata (Pd) has such objects from

Re: [Sursound] Reduced set of B-format (or HOA) to binaural filters

Thanks for the clarification, this makes perfect sense.. Archontis On 26 May 2016, at 10:06, Fons Adriaensen <f...@linuxaudio.org<mailto:f...@linuxaudio.org>> wrote: On Wed, May 25, 2016 at 10:23:23PM +0000, Politis Archontis wrote: So is this how it is usually done? Convolving

Re: [Sursound] Reduced set of B-format (or HOA) to binaural filters

On 26 May 2016, at 01:04, Eric Benjamin > wrote: I have used that symmetry in the past. I assume that everyone does. Hi Eric, good to know that it’s used by everybody and I wasn’t totally off in my “revelations” :-). It wasn’t mentioned before in

Re: [Sursound] Reduced set of B-format (or HOA) to binaural filters

to get one of the two ear signals. Best, Archontis On 25 May 2016, at 21:07, Fons Adriaensen <f...@linuxaudio.org<mailto:f...@linuxaudio.org>> wrote: On Wed, May 25, 2016 at 03:37:34PM +0000, Politis Archontis wrote: My question to any of the decoder developers on the list is if y

[Sursound] Reduced set of B-format (or HOA) to binaural filters

Hi, There has been some discussion before on B-format or HOA to binaural filters (HRTF-based), which no matter if it goes through a virtual decoder or with a direct HRTF-to-Bformat approach, two times the number of HOA channels of filters are needed (so 8 for B-format, 18 for 2nd-order HOA, 32

Re: [Sursound] Integrating binaural recordings into ambisonics

Hi Jamie, I’m not sure the transaural to B-format approach would work as, if I understand correctly, the cross-talk cancelation filters equalize the direct paths and minimize the cross-talk paths at two control points that are spaced apart (the ears). I’m not sure how you would capture that

Re: [Sursound] YouTube now supports Ambisonics (warning....part advertisement..)

> That would be wonderful to have a HOA version of this. I had searched on > your website for the tool to make it myself, but the page doesn't load > http://mchapman.com/amb/soft/positions/ > > Regards, > > Albert Hi, is that any different from opening up Reaper or any other DAW with some

Re: [Sursound] YouTube now supports Ambisonics (warning....part advertisement..)

Hi Albert, This is interesting! I don’t have an android and I cannot test it unfortunately. I would like to ask what are you doing with the B-format? decode it to headphones dynamically? Archontis > On 20 Apr 2016, at 18:29, Albert Leusink wrote: > > Hello all, > >

Re: [Sursound] YouTube now supports Ambisonics (warning....part advertisement..)

Hi David, if you are asking if the ACN/SN3D FOA is the same as the B-format, yes, first-order is the B-format anyway you look at it. The B-format in ACN/SN3D convention is the same as in the traditional definition without the W scaling and in the ACN order: B_ACN_SN3D = [sqrt(2)*W Y Z X].

Re: [Sursound] Anyone know anything about this?

Just a note that direct beamforming is not necessarily worse than encoding/decoding, it can be used for example to approximate in an optimal (least-squares) sense the directional patterns of an ambisonic decoder for some target speaker setup. I haven’t met personally the people in the company,

Re: [Sursound] [Warning! advertisement] Hefio earphones

know where > the deficiencies are. > Another method is to A/B with a known speaker set up, and eq the > headphones until they match. Unfortunately this is trial and error. So I do > see the value of these, if one has HRTF set that matches, or has been > learnt. > > Best >

Re: [Sursound] [Warning! advertisement] Hefio earphones

Hi Steve, I guess the idea is that if you equalize the response of the headphones/earphones, then you can apply the target response you need without undesired modifications by the headphones, and that can be individualized HRTFs if you have them, which include the effects you mentioned.

[Sursound] [Warning! advertisement] Hefio earphones

Hi, this is an advertisement pretty much, but I thought it could be interesting to people of the list. An ex-colleague of mine here at Aalto university made the brave decision to start his own company couple of years ago, applying the research he was doing, and these days they announced their

Re: [Sursound] Ambisonics for Android and also Oculus..

internally. It is just re-arranging of channels and a scaling in the end. Regards, Archontis On 03 Apr 2016, at 13:29, Politis Archontis <archontis.poli...@aalto.fi<mailto:archontis.poli...@aalto.fi>> wrote: The advantage of ACN is that it is a natural ordering of the HOA channel

Re: [Sursound] Ambisonics for Android and also Oculus..

The advantage of ACN is that it is a natural ordering of the HOA channels described with a single number q=n^2+n+m+1 (with n the order and m the degree), and it is aligned with pretty much any other field using spherical spectral analysis (graphics, signal processing, physics, etc...) , making

Re: [Sursound] expressing HRTFs in spherical harmonics

> The point is that, since the direct method is equivalent to > a decoding for the set of directions used to compute the SHT > (which will be the set for which you have HRIR), there is > nothing 'ideal' or special to it. It is just one specific case > of the decoder + virtual speakers method in

Re: [Sursound] expressing HRTFs in spherical harmonics

>> So what is the benefit then of adding a decoding stage in the middle? > The advantage of having an explicit decoder stage is that you > can tweak the decoder for optimum results. For example it can > be dual-band [1], or have some front preference, etc. I see. I find that more a matter of

Re: [Sursound] expressing HRTFs in spherical harmonics

> No, this is not true. The decoder and convolution matrix can be combined > into a (N+1)^2 * 2 convolution matrix. Ah true! by summing the terms.. > The only remaining difference is the set of directions. And it is known > that using too many speakers for a given order is suboptimal. So what

Re: [Sursound] expressing HRTFs in spherical harmonics

...@linuxaudio.org] Sent: 27 February 2016 12:14 To: sursound@music.vt.edu Subject: Re: [Sursound] expressing HRTFs in spherical harmonics On Thu, Feb 25, 2016 at 09:25:48PM +, Politis Archontis wrote: > - Measure the HRIRs at Q directions around the listener > - Take the FFT of all measurements > -

Re: [Sursound] expressing HRTFs in spherical harmonics

25, 2016 at 09:25:48PM +0000, Politis Archontis wrote: > - Measure the HRIRs at Q directions around the listener > - Take the FFT of all measurements > - For each frequency bin perform the SHT to the complex HRTFs, > up to maximum order that Q directions permit (and th

Re: [Sursound] expressing HRTFs in spherical harmonics

: On 01/26/2016 11:05 PM, Politis Archontis wrote: Hi Jorn, yes that is correct. I think however that the virtual loudspeaker stage is unnecessary. It is equivalent if you expand the left and right HRTFs into spherical harmonics and multiply their coefficients (in the frequency d

Re: [Sursound] expressing HRTFs in spherical harmonics

:48 To: sursound@music.vt.edu Subject: [Sursound] expressing HRTFs in spherical harmonics On 01/27/2016 01:56 PM, Jörn Nettingsmeier wrote: > On 01/26/2016 11:05 PM, Politis Archontis wrote: >> Hi Jorn, >> >> yes that is correct. I think however that the virtual loudspeaker

Re: [Sursound] Inventory of Ambisonics plug-ins/tools on OS X

Hi Daniel, There is also the HOA suite for Puredata from IEM Graz (IEM_ambi). BR, Archontis -- next part -- An HTML attachment was scrubbed... URL:

Re: [Sursound] HRTF tinting

this has to do with the OP headphones with the 4 drivers inside… Regards, Archontis > On 24 Feb 2016, at 19:58, Marc Lavallee <m...@hacklava.net> wrote: > > On Wed, 24 Feb 2016 14:27:36 + > Politis Archontis <archontis.poli...@aalto.fi> wrote: > >>> On 24

Re: [Sursound] OSSIC Kickstarter Campaign Begins

> On 24 Feb 2016, at 16:04, Steven Boardman wrote: > > Yes. > > Richard Furse’s Blue Ripple Sound uses HRTF tinting in their decoder, it > works very well. Although I think he may have a patent on it…:) > > Steve > Hi Steve, what is HRTF tinting? I haven’t heard

Re: [Sursound] Ambisonic Decoder Design Resources

(sorry for the double post, my mail manager is misbehaving..) ___ 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.

Re: [Sursound] Ambisonic Decoder Design Resources

Hi Richard, In terms of literature for general HOA decoding, the parts are all around, I personally like the papers by Franz Zotter cause they present all the relevant information in a clear and usable manner. The All-round Ambisonic Panning and Decoding paper in JAES I think has most of the

Re: [Sursound] Ambisonic Decoder Design Resources

Hi Richard, there are numerous articles, do you intend to use anything more specific? 2D or 3D decoding? regular or irregular setups? Or you are looking for the most general case? (when you say in C, do you mean published code examples?) And by low-orders do you mean first-order systems mainly

Re: [Sursound] Advice on practicalities of 16-speaker half-spherical arrangement

Hi Martin, one note on the arrangement, as far as I know, traditional ambisonic decoding won’t work on hemispherical setups (due to the partial coverage of the sphere by the speakers). You may have to use more recent/advanced methods to get decoding matrices, such as the energy-preserving

Re: [Sursound] Advice on practicalities of 16-speaker half-spherical arrangement

Hi Michael, What I had in mind are t-designs, which exist till a very high number of points and they have been used by various researchers in decoder design (and spherical acoustic processing in general). These are perfectly uniform for all practical purposes. And there exist other uniform

Re: [Sursound] Advice on practicalities of 16-speaker half-spherical arrangement

Hi Martin, HOA are not limited to icosahedra or only uniform arrangements (which exist also beyond the 5 platonic solids). It would be very hard to claim them flexible or universal if that was the case. Uniform arrangements though simplify decoder design significantly. As I mentioned you

Re: [Sursound] Never do electronic in public.

Hi David, I agree completely with what you say apart from a single point: This dichotomy is the exact reason why, in my opinion, proper binaural rendering is crucial. And I don’t think music is the issue here anyway (actually most of the people I know listening to music with loudspeakers at

Re: [Sursound] Never do math in public, or my take on explaining B-format to binaural

> On 30 Jan 2016, at 00:05, Richard Lee wrote: > > Just to bring everyone down to earth .. > > There are two easily reproduced experiments first carried out by prominent > members of this group which put these effects into perspective. They are > the > > Greene/Lee

Re: [Sursound] Never do math in public, or my take on explaining B-format to binaural

HI Bo-Erik, Sorry I wasn’t very clear on my comments about the HRTF order, Jörn covered it much better! You need very high orders if you want to preserve HRTFs as they are when you measure them, and the order that you can expand them depends on how many points you measure them around the

Re: [Sursound] Never do math in public, or my take on explaining B-format to binaural

Hi Fons, ___ From: Sursound [sursound-boun...@music.vt.edu] on behalf of Fons Adriaensen [f...@linuxaudio.org] Sent: 27 January 2016 23:58 To: sursound@music.vt.edu Subject: Re: [Sursound] Never do math in public, or my take on explaining B-format to binaural

Re: [Sursound] Never do math in public, or my take on explaining B-format to binaural

HI, yes there are multiple works from many reearchers on spherical harmonic expansion of HRTFs (Evans, Duraiswami, Dylan Menzies and others), Rozenn Nicol’s is a very thorough one, and the last (probably) on the list are two nice papers from Romigh and Brungart in IEEE’s Journal of Selected

Re: [Sursound] Never do math in public, or my take on explaining B-format to binaural

Hi Fons, these are great points you raise here! On 27 Jan 2016, at 00:13, Fons Adriaensen > wrote: I've been reading this thread with much interest, as it is exactly about the topic I've been working on for the last two months. * Most HRIR

Re: [Sursound] Never do math in public, or my take on explaining B-format to binaural

Hi Jorn, yes that is correct. I think however that the virtual loudspeaker stage is unnecessary. It is equivalent if you expand the left and right HRTFs into spherical harmonics and multiply their coefficients (in the frequency domain) directly with the coefficients of the sound scene (which

Re: [Sursound] Never do math in public, or my take on explaining B-format to binaural

gt; wrote: > > On Tue, Jan 26, 2016 at 10:05:07PM +, Politis Archontis wrote: > >> yes that is correct. I think however that the virtual loudspeaker >> stage is unnecessary. It is equivalent if you expand the left and >> right HRTFs into spherical harm

[Sursound] HOA-related public Matlab/Octave code

Hi, Please excuse the spam, but I thought that could be of interest to some people in the list. My name is Archontis Politis, I am a doctoral student in the spatial sound research group of Aalto University in Finland, working on parametric spatial sound recording/reproduction techniques, and

[Sursound] HOA-related public Matlab/Octave code

Hi, Please excuse the spam, but I thought that could be of interest to some people in the list. My name is Archontis Politis, I am a doctoral student in the spatial sound research group of Aalto University in Finland, working on parametric spatial sound recording/reproduction techniques, and