[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/
soon.
Cheers,
Markus
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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>
>
>
>
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