[PD] Stereo simulation of multichannel audio [ot?]

Markus Noisternig noisternig at iem.at
Mon Jul 20 16:48:24 CEST 2009

Hi Joao,

Nick has mentioned the IEM Ambisonics library for binaural rendering.  
I have updated my old website at the IEM (http://iem.at/Members/noisternig/bin_ambi 
  ), which now points to the current release of the library provided  
by Thomas Musil. The packages are pre-compiled for Win-XP / OS-X and  
should be easy to install and also contain Pd.

Linux users might find the source files in the packages, but we  
recommend to check-out them out from the corresponding folders at SVN http://sourceforge.net/projects/pure-data/ 
  ! We will publish a collection linked to pure-data at sourceforge at  
the IEM's open source repository http://sourceforge.net/projects/iem/  



On 20 juil. 09, at 15:45, Nicholas Mariette wrote:

> Hi Joao,
> It sounds like you need a stereo auralization of various  
> multichannel diffusion pieces.
> One option is to make a binaural down-mix of the multichannel  
> material, although that has the restriction of only sounding good on  
> headphones. This would still leave a decision on where to place  
> sound sources, and how to do the auralization (i.e. how to do the  
> room simulation, etc).
> For stereo speaker playback, there is not really a canonical  
> solution.  Again though, you could do an auralization of the  
> intended diffusion to an intermediate format like ambisonics, then  
> do a stereo decode.  This will not leave as much of a spatial  
> impression as a binaural mix, but it will be more portable to  
> different listening setups.
> Either way there are still various (essentially aesthetic/artistic)  
> decisions to make about the specification of the auralization.
> So you might find that the best results for generalised playback  
> (headphone or speakers), is just to make aesthetic decisions and do  
> a multichannel downmix.
> At any rate, if you want to explore ambisonic and/or binaural down- 
> mixes, the IEM tools for doing this are all in Pd extended.
> For more info on the binaural stuff, you can try the patches and  
> publications here:
> http://iem.at/Members/noisternig/bin_ambi
> The patches are windows only, but they can be reconstituted from the  
> IEM objects available for other platforms inside Pd Extended (or SVN).
> cheers
> Nick
> Nicholas Mariette
> Researcher
> Audio and Acoustics group
> LIMSI-CNRS, Orsay, France
> http://www.limsi.fr/Scientifique/aa/
> http://www.limsi.fr/Scientifique/ps/thmsonesp/SonEspace
> http://soundsorange.net
> nicholas.mariette at limsi.fr
> On Jul 20, 2009, at 3:30 PM, João Pais wrote:
>> Hi,
>> my laptop trio Endphase (http://www.endphase.net/) is going to work  
>> out
>> our archived recordings, so that we get decent stereo versions to  
>> spread
>> around. Since many of them are multichannel (from 4 to 8) in  
>> different
>> setups (not necessarily only 2d around the audience), we'll be  
>> searching
>> for efficient ways to try to "convert" the original audio to  
>> stereo. That
>> is, having a good as possible compromise between both situations,  
>> knowing
>> that a 100% simulation is impossible.
>> This is a field that I don't know that well, and we're still in the
>> beginning of the work. Does anyone has any suggestions to which  
>> approaches
>> are best? Ambisonics, phase inversion, hrtf, home medicine? Are any  
>> of
>> these also available through Pd? (it would be nice to mix/ 
>> spacialize the
>> materials in Pd)
>> Thanks,
>> João Pais
>> -- 
>> Friedenstr. 58
>> 10249 Berlin (Deutschland)
>> Tel +49 30 42020091 | Mob +49 162 6843570
>> jmmmpais at googlemail.com | skype: jmmmpjmmmp
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