Re: [Sursound] does anyone have harry f. olson, gradient microphones, jasa 1946?

2010-12-20 Thread Aaron Heller
I sent it to Jörn directly. RCA made a 2nd order microphone at one point http://www.coutant.org/bk10a/ Aaron 2010/12/20 Jörn Nettingsmeier netti...@stackingdwarves.net: it's cited in philip cotterel's thesis as the original source of the second-order gradient microphone. i can't believe

Re: [Sursound] Domestic speaker layout (was Re: Minim AD7 for sale)

2011-05-02 Thread Aaron Heller
with an eight-speaker bi-rectangle for 1st-order periphony, but that stretched the limits of domestic acceptability. Aaron Heller hel...@ai.sri.com Menlo Park, CA US ___ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo

Re: [Sursound] Minim AD7 for sale

2011-05-02 Thread Aaron Heller
back to the front for the reminder of the session. Aaron Heller hel...@ai.sri.com Menlo Park, CA US ___ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound

Re: [Sursound] Domestic speaker layout (was Re: Minim AD7 for sale)

2011-05-03 Thread Aaron Heller
2011/5/2 Jörn Nettingsmeier netti...@stackingdwarves.net: those slightly more speakers than necessary cases are a bit tricky... first order over a 24 hemisphere is horrible, At the 2008 demo I wrote about, other that the anomaly at the exact center, I thought it sounded pretty good. So did

Re: [Sursound] Minim AD7 for sale

2011-05-03 Thread Aaron Heller
appreciate having a couple of ladders in the living room. I also tried it with the vertical rectangle in the XZ plane. That works too. Contact me off list if you want the Ambdec config files I used. Aaron Heller hel...@ai.sri.com Menlo Park, CA US

Re: [Sursound] Distance perception

2011-07-26 Thread Aaron Heller
://dx.doi.org/10.1121/1.3596476 -- Aaron Heller (hel...@ai.sri.com) Menlo Park, CA US ___ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound

Re: [Sursound] new technology?

2011-08-31 Thread Aaron Heller
On Wed, Aug 31, 2011 at 6:06 PM, umashankar mantravadi umasha...@hotmail.com wrote: just read about this in the asa newsletter. anyone knows anything about it? http://www.visisonics.com/Products/AudioCamera.html It a commercial spinoff of work by Ramani Duraiswami and Adam O'Donovan at U of

Re: [Sursound] new technology?

2011-08-31 Thread Aaron Heller
Here's a more direct URL: http://www.umiacs.umd.edu/~odonovan/Audio_Camera/ Aaron On Wed, Aug 31, 2011 at 9:00 PM, Aaron Heller hel...@ai.sri.com wrote: On Wed, Aug 31, 2011 at 6:06 PM, umashankar mantravadi umasha...@hotmail.com wrote: just read about this in the asa newsletter. anyone

Re: [Sursound] problem with jconvolver on osx

2011-10-12 Thread Aaron Heller
, so I don't know how amenable it would be to that kind of approach. Best... Aaron Heller hel...@ai.sri.com Menlo Park, CA US ___ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound

Re: [Sursound] problem with jconvolver on osx

2011-10-12 Thread Aaron Heller
://threadingbuildingblocks.org/ I haven't studied zita-convolver in any detail, so I don't know how amenable it would be to that kind of approach. Best... Aaron Heller hel...@ai.sri.com Menlo Park, CA  US ___ Sursound mailing list Sursound@music.vt.edu

Re: [Sursound] online multichannel release

2011-11-25 Thread Aaron Heller
. Judging form the limited statistics I had access to and the comments on the site, many people downloaded, played successfully, and enjoyed the DTS-WAV files distributed on Ambisonia. If you need help with any of this, feel free to ask. -- Aaron Heller hel...@ai.sri.com Menlo Park, CA US

Re: [Sursound] Can anyone having ISO 9613-1 check this ?

2011-11-27 Thread Aaron Heller
of Acoustical Society of America, (97) pg 680, January 1995. % Bass, et al., Journal of Acoustical Society of America, (99) pg 1259, February 1996. % Kinsler, et al., Fundamentals of Acoustics, 4th ed., pg 214, John Wiley Sons, 2000. Aaron -- Aaron Heller hel...@ai.sri.com

Re: [Sursound] UHJ decoding and shelf filters

2011-12-16 Thread Aaron Heller
]) are add_row     0.102380  0.00  0.311540 It's in the high-50s (F) and about 40% RH here in Menlo Park. -- Aaron Heller (hel...@ai.sri.com) Menlo Park, CA US On Fri, Dec 16, 2011 at 3:33 AM, Fons Adriaensen f...@linuxaudio.org wrote: On Fri, Dec 16, 2011 at 09:34:04AM -, Richard

Re: [Sursound] approximate solutions to the ambisonic decoding problem

2011-12-29 Thread Aaron Heller
On Thu, Dec 29, 2011 at 3:06 PM, Franz Zotter zot...@iem.at wrote: ... see papers of last Ambisonics Symposia ... Are these available? The conference site still shows To be determined. http://www.vis.uky.edu/ambisonics2011/proceedings.php Aaron Heller (hel...@ai.sri.com) Menlo Park, CA

Re: [Sursound] approximate solutions to the ambisonic decoding problem

2012-01-07 Thread Aaron Heller
On Sat, Jan 7, 2012 at 1:48 AM, Franz Zotter zot...@iem.at wrote: Hi, On Friday 30 December 2011 03:37:42 Aaron Heller wrote: Are these available?  The conference site still shows To be determined.   http://www.vis.uky.edu/ambisonics2011/proceedings.php I asked the authors for their papers

Re: [Sursound] Decoding coefficients for non symmetrical setups

2012-02-29 Thread Aaron Heller
The code that goes with the LAC2012 conference paper does 3D and higher orders. In fact we used it to make a new 3rd-order Ambdec config for CCRMA's 22 speaker array. Its written in MATLAB/Gnu Octave, and it's not a lot of code. So plenty of opportunity for tinkering with the goal functions.

Re: [Sursound] Naive HOA Questions

2012-03-04 Thread Aaron Heller
http://www.ai.sri.com/ajh/ambisonics/tetra-rVrE/tetra.pdf [...] if you have to play back lower order material as well (such as a native soundfield recording), i found it is advisable to have a separate low-order decoder which uses fewer speakers, for better clarity and less phasing. aaron

Re: [Sursound] blindly identifying matrix encodings

2012-03-10 Thread Aaron Heller
Following up, I made a UHJ version of Eight Directions. Grab it and the MATLAB code that made it from http://ambisonics.dreamhosters.com/ (at the bottom of the page) As you can see from the code, is is easy to plug in any coefficients needed. On Fri, Mar 9, 2012 at 2:07 PM, Aaron Heller

Re: [Sursound] Can anyone help with my dissertation please?

2012-04-02 Thread Aaron Heller
Ambisonics Around for the technical details of the process. http://www.ambisonic.net/pdf/ambisonics_around.pdf I know there were several hundred downloads of my recordings in that format -- Stravinsky, Beethoven, Brahms, Dvorak, recorded with my Soundfield MkIV for NPR's Performance Today. -- Aaron

Re: [Sursound] Can anyone help with my dissertation please?

2012-04-02 Thread Aaron Heller
2012, Aaron Heller wrote: Um.  Every single recording on Ambisonia was available as a DTS-CD RIFF/WAV file of a 4.0 decode (that is, Center and LFE were silent).  All one needed to do was burn them to a CD and play in a DVD player connected to a 5.1 home theater set up.   See Richard

Re: [Sursound] OT: Spatial music

2012-04-04 Thread Aaron Heller
-- Aaron Heller (hel...@ai.sri.com) Menlo Park, CA US On Wed, Apr 4, 2012 at 1:48 AM, Michael Chapman s...@mchapman.com wrote: Unless of course they publish a file format for it Want a minimal and purposely highly (even overtly) extensible one? That I can design. In fact I've meant to do

Re: [Sursound] Blumlein versus ORTF

2012-04-04 Thread Aaron Heller
Recording Techniques, AES Preprint 6610. http://www.aes.org/e-lib/browse.cfm?elib=13352 http://www.aes.org/e-lib/browse.cfm?elib=13352 -- Aaron Heller (hel...@ai.sri.com) Menlo Park, CA US On Tue, Apr 3, 2012 at 3:01 PM, Robert Greene gre...@math.ucla.edu wrote: Thanks everybody for the links

[Sursound] DTS files (was Re: Can anyone ...)

2012-04-04 Thread Aaron Heller
replacement, and the Brahms after further tweaking by Richard Lee and Eric Benjamin. Thanks Aaron On Tue, Apr 3, 2012 at 6:12 PM, David Pickett d...@fugato.com wrote: At 14:01 02/04/2012, Aaron Heller wrote: I put some files at   http://ambisonics.dreamhosters.com/DTS/ I downloaded, cut

[Sursound] multichannel audio over HDMI

2012-05-25 Thread Aaron Heller
Since Bo-Erik mentioned it, I've been wondering about multichannel computer audio over HDMI to a home theater amp. Does anyone know if ALSA on Linux or Core Audio on MacOS support this? In other words, if I'm running Linux on a motherboard with HDMI output, do the eight channels of audio show up

Re: [Sursound] microphone epiphany ?

2012-05-28 Thread Aaron Heller
significantly from the idealized math models used here. In addition, the capsules shadow each other and the space in the middle acts as a resonant cavity. So you really have to measure the finished array and then design the EQ. -- Aaron Heller (hel...@ai.sri.com) Menlo Park, CA US On Sun, May 27

Re: [Sursound] Setting up my first ambisonic system

2012-06-10 Thread Aaron Heller
on with Scribd, but I've updated the page with direct links to PDFs of all the papers. (BLaH3 has several updates over previous versions). http://www.ai.sri.com/ajh/ambisonics/ which is mirrored at http://ambisonics.dreamhosters.com/ -- Aaron Heller (hel...@ai.sri.com) Menlo Park, CA US

Re: [Sursound] preferred (small) linux distro for audio?

2012-07-04 Thread Aaron Heller
I can second the recommendation for Planet CCRMA. I've used it for for audio work for a decade (since Red Hat 7 days) on various mini-ITX based systems and laptops. 'Nando Lopez-Lezcano (the maintainer) and others on the mailing list are helpful and quick to reply. On Wed, Jul 4, 2012 at 9:51

Re: [Sursound] Demo / test piece

2012-09-27 Thread Aaron Heller
Very good idea. OK with me. Aaron (hel...@ai.sri.com) Menlo Park, CA US On Thu, Sep 27, 2012 at 3:43 AM, Michael Chapman s...@mchapman.com wrote: Earlier today, I referred to a slow pan of a symphonic piece. Perhaps it would be of interest to others : -as a demo of ambisonic panning

Re: [Sursound] Hybrid Hi-Fi (HyFi?), IRs, etc.

2012-10-05 Thread Aaron Heller
A bit of a warning... Richard Furse's Ambisonic Decoding Equations page is a useful resource, but is a bit vague on how the different matrices should be used (or adapted). Specifically, the coefficients listed as Rig Decode Matrix to Reproduce Spherical Harmonics (which have also been called

Re: [Sursound] Trans-Dimensional Portal

2012-10-11 Thread Aaron Heller
On Thu, Oct 11, 2012 at 9:55 AM, Charlie Richmond charlie@gmail.com wrote: On Thu, Oct 11, 2012 at 9:51 AM, Stefan Schreiber st...@mail.telepac.ptwrote: Sampo Syreeni wrote: How about a simple group called ambisonic or Ambisonics, in FB? There already is an ambisonics group in fb:

Re: [Sursound] Ambisonic 'File' Formats

2012-10-30 Thread Aaron Heller
On Tue, Oct 30, 2012 at 9:01 AM, Michael Chapman s...@mchapman.com wrote: 'Native' CAF also has the possibility for 'W,X,Y,Z' so (again without acknowledgment) I suspect that could be counted as a *.amb variant. Has anyone had any success with this? It's in the Core Audio header files, but a

Re: [Sursound] Array for sound field recording and extend the sound image

2013-01-07 Thread Aaron Heller
Without more details, it hard to speculate about problems, but I'll note that subtracting the outputs of two omnis to get a fig-8 response will result in a frequency response that rises 6dB/octave with a 90 degree phase shift relative to the sum. Unless that is corrected, these signals are not

Re: [Sursound] KEMAR, Neumann, Zwislocki

2013-03-29 Thread Aaron Heller
Peus, 1985: Natural Listening with a Dummy Head, English, 6 pages Aaron Heller (hel...@ai.sri.com) Menlo Park, CA UA -- next part -- An HTML attachment was scrubbed... URL: https://mail.music.vt.edu/mailman/private/sursound/attachments/20130329/f0622412/attachment.html

Re: [Sursound] Surround formats and lossy compression

2013-04-07 Thread Aaron Heller
some discussion here: http://searchstorage.techtarget.com/definition/Kibi-mebi-gibi-tebi-pebi-and-all-that Aaron Heller (hel...@ai.sri.com) Menlo Park, CA US -- next part -- An HTML attachment was scrubbed... URL: https://mail.music.vt.edu/mailman/private/sursound

Re: [Sursound] Optimised Decoder matrix (Ambdec)

2013-04-19 Thread Aaron Heller
usable. I've have NFC and phase-matched crossovers filters working in Faust, but not integrated yet. If anyone like to try it, contact me off list (hel...@ai.sri.com) and I'll send you a beta copy. I'll be doing a general release as soon as I get some instructions written up. Aaron Heller (hel

Re: [Sursound] Overzealous Underthinking

2013-04-23 Thread Aaron Heller
mic at right angles and you have a natural horizontal B-format array (WXY). Martin Kantola's Panphonic microphone works this way: http://www.panphonic.com/ Aaron Heller (hel...@ai.sri.com) Menlo Park, CA US On Tue, Apr 23, 2013 at 12:45 PM, Eric Carmichel e...@elcaudio.com wrote: This post

Re: [Sursound] Optimised Decoder matrix (Ambdec)

2013-04-23 Thread Aaron Heller
listen and report back on what you hear. Aaron Heller (hel...@ai.sri.com) Menlo Park, CA US -- next part -- An HTML attachment was scrubbed... URL: https://mail.music.vt.edu/mailman/private/sursound/attachments/20130423/2df0a9dd/attachment.html

Re: [Sursound] What does a mic with more than 4 channels give you?

2013-04-26 Thread Aaron Heller
have reported good results with 8, others report spectral contamination. Mathematical analysis supports the latter. Aaron Heller Menlo Park, CA US -- next part -- An HTML attachment was scrubbed... URL: https://mail.music.vt.edu/mailman/private/sursound/attachments

Re: [Sursound] Naive question on MS and Ambisonics

2013-05-09 Thread Aaron Heller
Helmut Wittek gave a paper Tonmeistertagung 2006 that discusses the relationship between Schoeps Double-MS and Ambisonic B-format. http://hauptmikrofon.de/HW/TMT2006_Wittek_DoubleMS_neutral.pdf English translation here: http://www.schoeps.de/documents/SCHOEPS_Double_MS_paper_E_2010.pdf

Re: [Sursound] theatrical ambisonics

2013-05-12 Thread Aaron Heller
On Sun, May 12, 2013 at 3:59 AM, Iain Mott m...@reverberant.com wrote: The Earfilms link is interesting. I wonder if people on the list have other references or links on ambisonics applied in theatrical productions, either traditional theatre or theatrical installation? Your own productions

Re: [Sursound] [allowed] Re: Recreating a 3d soundfield with lots of mics.....

2013-05-19 Thread Aaron Heller
On Sat, May 18, 2013 at 3:01 AM, Rev Tony Newnham revtonynewn...@blueyonder.co.uk wrote: Indeed - there's a picture or two in one of his books, which I have here somewhere. I don't think he tried to mimic the piositions of instruments within an ensemble though - except maybe the piano. No

Re: [Sursound] a query

2013-06-23 Thread Aaron Heller
The term Ambisonics does not appear at all in Fellgett's 9/72 article [1], but is in the title in 11/73 [2]. [1] P. Fellgett, “Directional information in reproduced sound,” Wireless World, vol. 78, no. 1443, pp. 413–417, 1972. [2] P. Fellgett, “Ambisonic reproduction of sound,” Electronics and

Re: [Sursound] Giving Precedence to Ambisonics

2013-06-26 Thread Aaron Heller
it on orchestral recordings at his studio in Stockton and it sharpens up the orchestra image nicely. Aaron Heller (hel...@ai.sri.com) Menlo Park, CA US On Wed, Jun 26, 2013 at 10:02 AM, Eric Carmichel e...@elcaudio.com wrote: Greetings All, I have a friend who's an advocate of the Decca Tree

Re: [Sursound] Ambisonics - Decoding 16 channels in DAW

2013-07-03 Thread Aaron Heller
here: http://faust.grame.fr Aaron Heller (hel...@ai.sri.com) Menlo Park, CA US On Wed, Jul 3, 2013 at 7:33 AM, Moritz Fehr m...@moritzfehr.de wrote: hi everyone, thank you very much for your replies -- what i would like to achieve is playing a mix of a b-format recording combined

Re: [Sursound] Two new approaches for the distribution of surround sound/3D audio

2013-08-02 Thread Aaron Heller
in the encoder? Aaron Heller (hel...@ai.sri.com) Menlo Park, CA US On Fri, Aug 2, 2013 at 9:39 AM, Stefan Schreiber st...@mail.telepac.ptwrote: Martin Leese wrote: Stefan Schreiber wrote: ... To offer a backward-compatible extension of a UHJ extended AAC stereo file, you would have

Re: [Sursound] Two new approaches for the distribution of surround sound/3D audio

2013-08-14 Thread Aaron Heller
...@ai.sri.com) if you want to try it out. Aaron Heller Menlo Park, CA US -- next part -- An HTML attachment was scrubbed... URL: https://mail.music.vt.edu/mailman/private/sursound/attachments/20130813/72153f52/attachment.html

Re: [Sursound] Esfera Mic: IBC launch

2013-09-14 Thread Aaron Heller
I don't know if it is relevant, but I found this patent application http://www.faqs.org/patents/app/20110135098 Patent application title: METHODS AND DEVICES FOR REPRODUCING SURROUND AUDIO SIGNALS Inventors: Markus Kuhr (Wedemark, DE) Jurgen Peissig (Wedemark, DE) Axel Grell (Wedemark, DE)

Re: [Sursound] Esfera Mic: IBC launch

2013-09-14 Thread Aaron Heller
Also here, with PDF http://www.google.com/patents/US20110135098 (I see Google Patents, now has a Find prior art button) On Sat, Sep 14, 2013 at 8:36 AM, Aaron Heller hel...@ai.sri.com wrote: I don't know if it is relevant, but I found this patent application http://www.faqs.org

Re: [Sursound] Volume question WRT 7.1 sound recorded at listening position.

2013-09-23 Thread Aaron Heller
On Mon, Sep 23, 2013 at 3:55 PM, Andy Furniss adf.li...@gmail.com wrote: I don't quite understand the in phase though, are you saying that they artificially adjust phase for the same sound that comes out of more than one speaker to affect the mixdown? The Recording Academy recommendations

Re: [Sursound] A-format panner.

2013-09-26 Thread Aaron Heller
A first-order B-format panner needs to implement the equations W = S * sqrt(1/2) X = S * cos(az) * cos(el) Y = S * sin(az) * cos(el) Z = S * sin(el) where S is the signal being panned and az and el define the direction. The Calrec Soundfield MkIV controller box has analog circuitry for

Re: [Sursound] A-format panner.

2013-09-27 Thread Aaron Heller
On Thu, Sep 26, 2013 at 12:15 PM, Eero Aro eero@dlc.fi wrote: The Soundfield microphone directional controls aren't exactly panning. Sorry to quibble, but if I feed a signal into the W and X inputs (with appropriate scaling) and ground Y and Z, then the soundfield controls on a Mk4 behave

[Sursound] two new BBC Research white papers on Ambisonics

2013-10-08 Thread Aaron Heller
[1] P. Power, C. Dunn, B. Davies, and J. Hirst, “Localisation of Elevated Sources in Higher-Order Ambisonics,” BBC RD, WHP 261, Oct. 2013. http://www.bbc.co.uk/rd/publications/whitepaper261 [2] D. Satongar, C. Dunn, Y. Lan, and F. Li, “Localisation Performance of Higher-Order Ambisonics for

Re: [Sursound] two new BBC Research white papers on Ambisonics

2013-10-08 Thread Aaron Heller
of Arts, Design and Technology University of Derby, UK e: p.len...@derby.ac.uk t: 01332 593155 From: Sursound [sursound-boun...@music.vt.edu] On Behalf Of Aaron Heller [ hel...@ai.sri.com] Sent: 08 October 2013 23:10 To: Surround Sound discussion group

[Sursound] Acoustic echoes reveal room shape

2013-10-17 Thread Aaron Heller
Interesting paper in PNAS, from July. I believe it is open access, so anyone can read/download. Aaron http://www.pnas.org/content/110/30/12186.short The supplemental information (SI) shows some of the equipment and more math. I. Dokmanić, R. Parhizkar, A. Walther, Y. M. Lu, and M. Vetterli,

Re: [Sursound] Hector bird recording - SoundCloud

2013-11-21 Thread Aaron Heller
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

Re: [Sursound] VR and cheap headtracking in 2013...

2013-12-02 Thread Aaron Heller
Not cheap, but the Smyth Research Realizer does do head tracking with any headphones. It also measures your HRTFs and headphone's response. I played with it at Burning Amp this year and it was quite effective at externalizing the sound from headphones.

[Sursound] Ambisonic depending Aural recognition,

2013-12-15 Thread Aaron Heller
The wikipedia article on Ambisonics has the following paper under Source texts on Ambisonics – basic theory. I can't seem to find a copy from my usual sources. Do any of have a copy? W.C.Clarck, K.Alimi, B.Spendor: Ambisonic depending Aural recognition, International Institute of Inuitive

Re: [Sursound] Upcoming Android apps ambisonic related

2013-12-20 Thread Aaron Heller
On Fri, Dec 20, 2013 at 7:40 PM, David Worrall worr...@avatar.com.auwrote: I remember reading that, with exposure, human's audio-processing hardware can adapt to/learn how to use a non-optimal HRTF, given a bit of time. Does anyone have a reference for this? I don't know about

Re: [Sursound] Motion-Tracked Binaural

2013-12-28 Thread Aaron Heller
Dick Duda and Ralph Algazi gave a talk and demo at a San Francisco AES meeting at Dolby Labs a few years ago. At that time, they were recording with a head-sized sphere with either 8 or 16 microphones around the equator. They imagined that 8 would be used for teleconferencing and 16 for music

[Sursound] Sensory evaluation of concert halls

2014-01-17 Thread Aaron Heller
Jan 2014 Physics Today just landed on my desk and the cover article is by Tapio Lokki on evaluation of concert halls. Tasting music like wine: Sensory evaluation of concert halls http://scitation.aip.org/content/aip/magazine/physicstoday/article/67/1/10.1063/PT.3.2242 It is labeled free

Re: [Sursound] Sensory evaluation of concert halls

2014-01-17 Thread Aaron Heller
/journal/poma/19/1/10.1121/1.4799424 On Fri, Jan 17, 2014 at 12:28 PM, Jörn Nettingsmeier netti...@stackingdwarves.net wrote: On 01/17/2014 07:29 PM, Aaron Heller wrote: Jan 2014 Physics Today just landed on my desk and the cover article is by Tapio Lokki on evaluation of concert halls

Re: [Sursound] Construction of purpose built ambisonic studio.

2014-03-08 Thread Aaron Heller
Steve, I'm not sure I follow everything you're saying about angle errors, but there are a few installations that work well here in the SF Bay area that I have personal experience with. The Listening Room at Stanford's CCRMA is a 3rd-order periphonic facility, described here

Re: [Sursound] BBC Radio Three Surround Streaming Trial (15. to 31.March)

2014-03-17 Thread Aaron Heller
I have a GigaPort AG connected by USB to my MacBook Pro and it works correctly with Chrome Version 33.0.1750.152 I used Audio MIDI Setup (in /Applications/Utilites) and selected Multichannel/5.1 Surround for the speaker configuration of the GigaPort device. Aaron Heller (hel...@ai.sri.com

Re: [Sursound] Periphonic Irregular HO Ambisonics Decoder

2014-03-17 Thread Aaron Heller
if WBIN is considered True, and WBIN is actually a constant set to 0. -- Marc Le Tue, 18 Mar 2014 01:01:25 +, Fons Adriaensen f...@linuxaudio.org a écrit : On Mon, Mar 17, 2014 at 05:06:32PM -0700, Aaron Heller wrote: On Mon, Mar 17, 2014 at 1:09 PM, Fons Adriaensen f

Re: [Sursound] Auro 3D

2014-03-18 Thread Aaron Heller
There were three 'with height' workshops at the 2012 AES meeting in San Francisco* that featured an Aura 3D playback setup. David Bowles (Swineshead) and Paul Geluso (NYU) played some recordings that were quite nice -- height in front, with convention surrounds -- but the remainder, including

Re: [Sursound] NAB2014 Sighting; 360 degree camera arrangement very like a Soundfield microphone

2014-04-10 Thread Aaron Heller
I recall this camera cluster being used for the Lincoln Sound and Vision production with that odd four faced binaural dummy head. http://now.lincoln.com/2013/02/an-entirely-new-sound-and-vision-2/ On Thu, Apr 10, 2014 at 10:39 AM, mgra...@mstvp.com wrote: While at NAB2014 in Las Vegas

Re: [Sursound] BBC Proms in 4.0

2014-07-19 Thread Aaron Heller
On Sat, Jul 19, 2014 at 9:47 AM, m...@superorg.com wrote: On 19 Jul 2014, at 10:13, Ralf R Radermacher wrote: Am 18.07.14 15:21, schrieb Rupert Brun: The BBC will make the BBC Proms Concerts available in 4.0 using MPEG-DASH. The stream will be available internationally. Does anyone have the

Re: [Sursound] AES London Lecture

2014-12-31 Thread Aaron Heller
On Wed, Dec 31, 2014 at 3:20 AM, Dave Malham dave.mal...@york.ac.uk wrote: I wonder how closely this is related to the paper he was one of the authors of at the 2010 Ambisonics Symposium? Anyone have it handy? Here's the URL:

Re: [Sursound] YouTube adds ambisonics support

2016-01-14 Thread Aaron Heller
Hi Aaron, > > Thanks for pointing that out; just a series of bad (horrible, really!) > typos from transcribing code. :) The equations should be corrected now. > > Dillon > > On Thu, Jan 14, 2016 at 9:13 AM Aaron Heller <hel...@ai.sri.com> wrote: > > > Unfortunate

Re: [Sursound] Help me with ADT

2016-02-29 Thread Aaron Heller
oordinates are in the last three columns of the csv file. If you are still having trouble, please send me the speaker coordinates (in private email) and I will be happy to create the files for you. Best... Aaron Heller (hel...@ai.sri.com) Menlo Park, CA, US On Sun, Feb 28, 2016 at 2:30 PM, Mar

Re: [Sursound] grambilib~ for Pd

2016-03-10 Thread Aaron Heller
Hi Ricky, I took a quick look at grambipan.c. For FuMa U you've written 189: (*APout4++) = sample1 * (2 * cosf(sample2)) * cosf(sample3) * cosf(sample3); //U whereas the correct expression (found on Richard Furse's webpage, for example) is U:cos(2A) cos(E) cos(E) Please note that

Re: [Sursound] OT Stereo stage width - Was: Static stereo source in rotating soundfield, possible?

2016-03-31 Thread Aaron Heller
Marc Lavallée, Eric Benjamin, and I put together a Trifield (three speaker stereo) plugin and demo'ed it a Burning Amp last fall. It is hosted at https://bitbucket.org/ajheller/trifield/overview It is written in Faust so can be compiled for a number of different hosts, but we provide

Re: [Sursound] Re-Routing VST Plugin

2016-04-12 Thread Aaron Heller
ab, specify "windows" and "vst" and download the VST plugin. (or AU, or LADSPA, or MaxMSP, or ...). More on Faust at http://faust.grame.fr/Documentation/ -- Aaron Heller (hel...@ai.sri.com) Menlo Park, CA US On Tue, Apr 12, 2016 at 1:30 AM, Jörn Nettingsmeier < netti...@

Re: [Sursound] Furse-Malham to ACN conversion

2016-03-24 Thread Aaron Heller
AM, Aaron Heller <hel...@ai.sri.com> wrote: > > > > On Thu, Mar 24, 2016 at 10:47 AM, Aaron Heller <hel...@ai.sri.com> wrote: >> >> ISO/IEC 14496-11 "Information technology — Coding of audio-visual objects —Part 11: Scene description and application engine"

Re: [Sursound] Furse-Malham to ACN conversion

2016-03-24 Thread Aaron Heller
uldn't find information about > > their HOA channel ordering and normalization scheme. > > Could you please point me to these? > > > > Thank you, > > Sönke > > > > > > 2016-03-24 7:25 GMT+01:00 Aaron Heller <hel...@ai.sri.com>: > > > > > Martin

Re: [Sursound] Furse-Malham to ACN conversion

2016-03-24 Thread Aaron Heller
On Thu, Mar 24, 2016 at 10:47 AM, Aaron Heller <hel...@ai.sri.com> wrote: > ISO/IEC 14496-11 "Information technology — Coding of audio-visual objects > —Part 11: Scene description and application engine" (second edition, dated > 11/2013; see Table 9 in page 36) > &

Re: [Sursound] Flac for FOA or amb files?

2016-03-25 Thread Aaron Heller
>From an existing AMB file, any of these will work . flac --channel-map=none AJH_eight-positions.amb . sox AJH_eight-positions.amb AJH_eight-positions.flac . open AMB file in Audacity and then export selecting FLAC format Note that FLAC is limited to eight channels, so this will work for

Re: [Sursound] Furse-Malham to ACN conversion

2016-03-24 Thread Aaron Heller
Martin, Note that while AmbDec can accommodate FuMa normalization on input, it still makes the connections to jack in ACN order so the inputs will often appear in Jack in ACN order (and never in FuMa order). I say "often" because the Jack API does not have any notion of the 'order' of an

Re: [Sursound] Furse-Malham to ACN conversion

2016-03-24 Thread Aaron Heller
Make that "compiled to VST"... http://faust.grame.fr/onlinecompiler/ On Wed, Mar 23, 2016 at 11:25 PM, Aaron Heller <hel...@ai.sri.com> wrote: > Martin, > > Note that while AmbDec can accommodate FuMa normalization on input, it > still makes the connections to jac

Re: [Sursound] Different usages, different spaces, different decoders?

2016-03-03 Thread Aaron Heller
In BLaH11 (AES 137, 10/2014, Los Angeles) , Eric and I compared horizontal FOA over a 2-meter radius 4-speaker diamond vs. 8-speaker octagon with binaural dummy head measurements and listening tests. (classic decoding: 2-band, rV=1 at LF, rE=sqrt(1/2) at HF, 400 Hz xover, NFC). The TL;DR summary

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

2016-04-25 Thread Aaron Heller
Is there some trick to uploading these files? The files I make upload, but then fail during processing. I make the files like this: $ /opt/local/bin/ffmpeg -loop 1 -framerate 30 -i cube-1920x960.png -i > AJH_eight-positions-ambix.wav -map 0:v -map 1:a -c:a pcm_s16le > -channel_layout quad

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

2016-04-21 Thread Aaron Heller
looked at the spatial spreading of energy with a simple parametric decoder. No listening tests, just visual comparison of plots of spatial energy. We found very little spreading with low-complexity AAC, but a fair amount with HE-AAC. Aaron Heller (hel...@ai.sri.com) Menlo Park, CA US -- n

Re: [Sursound] B-Format encoding equations

2016-04-18 Thread Aaron Heller
/ambidecodertoolbox/adt/src/6c6bdc2460352cd4b72d2dde6928fcb5141d1976/faust/ambi_panner_ambix_o5.dsp?fileviewer=file-view-default Aaron Heller (hel...@ai.sri.com) Menlo Park, CA US On Mon, Apr 18, 2016 at 9:12 AM, Courville, Daniel <courville.dan...@uqam.ca > wrote: > Jan wrote: > >

Re: [Sursound] Help: what am I doing wrong?

2017-07-05 Thread Aaron Heller
Hi Martin, A few things... 1. You should use a first-order decoder to play first-order sources. That's not the same as playing a first-order file into the first-order inputs of a third-order decoder. 2. 1st-order periphonic (3D) ambisonics on a full 3D loudspeaker array gets the energy correct,

Re: [Sursound] Help: what am I doing wrong?

2017-07-05 Thread Aaron Heller
Forgot the URL... http://www.ai.sri.com/~heller/ambisonics/index.html#test-files On Wed, Jul 5, 2017 at 6:15 PM, Aaron Heller <hel...@ai.sri.com> wrote: > I have some first-order test files that you can try. They're FuMa > order/normalization. There's "eight directions&quo

Re: [Sursound] Help: what am I doing wrong?

2017-07-06 Thread Aaron Heller
The decoders produced by my toolbox in FAUST (the ".dsp" files) have distance, level, and near-field compensation up to 5th-order (and more soon). Those can be compiled to a large number of plugin types, including VST, AU, MaxMSP, ... https://bitbucket.org/ambidecodertoolbox/adt Aaron On

Re: [Sursound] multichannel VST recorder os x

2017-06-20 Thread Aaron Heller
Oli... Perhaps more than you wanted, but Plogue Bidule has a 16-channel recorder (up to 32 ch) and is available as VST and AU plugins. It will also host VST and AU plugins, and do many other types of processing. There is a standalone version as well that interfaces to audio devices directly.

Re: [Sursound] multichannel VST recorder os x

2017-06-21 Thread Aaron Heller
> On Jun 21, 2017, at 1:13 PM, Oliver Larkin wrote: > > > I had tried bidule, but it looked like it was going to record 16 mono files The setting in Bidule's Audio File Recorder is a bit confusing here... if you set "Channels per File" to "Stereo" it records all the

Re: [Sursound] getting the peak frequency from microphone input

2017-10-25 Thread Aaron Heller
Doing this was one of the programming assignments in the course "Audio Signal Processing for Music Applications" https://www.coursera.org/learn/audio-signal-processing Excellent course. Tools here: https://www.upf.edu/web/mtg/sms-tools https://github.com/MTG/sms-tools On Tue, Oct

Re: [Sursound] Simple Software to Play a 6-channel WAV File

2017-10-25 Thread Aaron Heller
I use it extensively as well. Easy to control from a midi control surface if you need physical controls. Glad to help with any questions. Aaron On Wed, Oct 25, 2017 at 11:58 AM, Fons Adriaensen wrote: > On Wed, Oct 25, 2017 at 02:43:23PM -0400, len moskowitz wrote: > > >

Re: [Sursound] getting the peak frequency from microphone input

2017-10-25 Thread Aaron Heller
> > > On Oct 25, 2017, at 10:59 AM, Aaron Heller <ajhel...@gmail.com> wrote: > > > > Doing this was one of the programming assignments in the course "Audio > > Signal Processing for Music Applications" > > > > https://www.coursera.org/learn/a

Re: [Sursound] octofile release

2018-07-29 Thread Aaron Heller
om Etienne Deleflie's Universal Ambisonic work https://tools.ietf.org/html/draft-ietf-codec-ambisonics-07 Martin Leese has posted pointers to it here from time to time. Early versions had errors, which I informed them of and were fixed in later versions. Aaron Heller (hel...@ai.sri.com) Menl

Re: [Sursound] oktava 1st order mic

2018-03-12 Thread Aaron Heller
The radius of the tetrahedral array determines the frequency at which the B-format polar patterns start to breakdown. The formula given by Gerzon is c/(pi*r), where c is the speed of sound and r is the radius of the array[1]. Depending of the design, the acoustic radius is about 10% larger than

Re: [Sursound] Sursound Digest, Vol 116, Issue 3

2018-03-08 Thread Aaron Heller
the Audio MIDI Setup program. Aaron Heller Menlo Park, CA US On Thu, Mar 8, 2018 at 5:54 AM, Augustine Leudar <augustineleu...@gmail.com> wrote: > > Hi Marc, > The processing involve dhere is not too CPU intensive - rather its whether > the graphics card is capable of transmitting

Re: [Sursound] Twirling 720 Microphone

2018-03-08 Thread Aaron Heller
, the diffuse field response will be wrong. Aaron Heller (hel...@ai.sri.com) Menlo Park, CA US On Thu, Mar 8, 2018 at 4:27 PM, Marc Lavallée <m...@hacklava.net> wrote: > > Hi Steven, and thanks for the useful info. > > The fact that the Twirling720 presents itself as a ste

Re: [Sursound] Twirling 720 Microphone

2018-03-08 Thread Aaron Heller
One correction, before you invert the A-to-B gain matrix, you have to account for the -3dB gain on W in B-format FuMa. On Thu, Mar 8, 2018 at 8:35 PM, Aaron Heller <ajhel...@gmail.com> wrote: > A friend bought one, so I've been doing some reverse engineering. > > In the 96

Re: [Sursound] Sursound Digest, Vol 116, Issue 3

2018-03-08 Thread Aaron Heller
One more detail... I had to create an Aggregate audio device to get it working with Jack. I don't remember the details, but could refresh my memory if anyone needs them. On Thu, Mar 8, 2018 at 8:59 PM, Aaron Heller <ajhel...@gmail.com> wrote: > I have a "Mid-2010"

[Sursound] Into the Soundfield

2018-10-14 Thread Aaron Heller
A new site hosting Stephen Thorton's diaries and a new film about Michael Gerzon and Ambisonics at Oxford https://intothesoundfield.music.ox.ac.uk All very nicely done. Aaron Heller (hel...@ai.sri.com) Menlo Park, CA US -- next part -- An HTML attachment

Re: [Sursound] Octomic Impulses Up North

2018-09-22 Thread Aaron Heller
The is known as the "substitution method" in microphone calibration literature. On Sat, Sep 22, 2018 at 9:07 AM Fons Adriaensen wrote: > On Sun, Sep 16, 2018 at 12:18:54PM -0600, Jonathan Kawchuk wrote: > > > I'm also curious if anyone has experimented with running an inverse EQ > > calibration

Re: [Sursound] Anyone ever tried to bypass youtube/facebook360 player Ambisonics decoder?

2019-02-20 Thread Aaron Heller
If it is any help, the script I wrote to make YouTube videos from AMB files is here: https://bitbucket.org/ambidecodertoolbox/amb2yt/src Some samples that might help you reverse engineer the format https://youtu.be/eY9DMn8pgGA https://youtu.be/RC4ptd9B-NA You could make a file with

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