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-d...@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
[email protected]
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
[email protected] | skype: jmmmpjmmmp
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