[Sursound] "Digital Amplifiers" (Multichannel Amps with ADAT input)

2012-05-08 Thread D. Sen

Anyone know of multichannel power amps with ADAT inputs?

I think one of the WFS rigs at TU-Berlin were using these - but they may 
have been custom made.


Thanks,
Deep
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[Sursound] Job opening in 3D-audio research & development

2012-04-16 Thread D. Sen
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[Sursound] Job opening in 3D-audio research & development

2012-04-13 Thread D. Sen

*Call for post-doctoral candidates for research positions in 3D-audio

*

The Audio R&D team at Qualcomm (based in San Diego, California) is 
looking for candidates for several positions involving a number of 
ongoing projects in the domain of 3D-audio research and applications.


The audio team is involved in various projects which involve soundfield 
acquisition through microphone arrays, subsequent analysis and 
soundfield synthesis through loudspeaker arrays.



We are searching for candidates for post-doctoral candidates with 
experience in Higher-Order-Ambisonics and/or Wavefield Synthesis.


A familiarity with audio coding techniques is a plus. A working 
knowledge of Matlab is a must.


Applicants should be highly motivated, independent, and able to work 
well in a group.


Applications with an attached resume should be sent  to : 
d...@qualcomm.com 



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Re: [Sursound] Decoding coefficients for non symmetrical setups

2012-03-01 Thread D. Sen

I am curious about how the following paper fits into all this:

Arnaud Laborie, Remy Bruno, and Sebastien Montoya, "Reproducing 
multichannel sound on any speaker layout," 118th AES Convention, Paper 
#6375, 2005 May 28–31 Barcelona, Spain.


I know the authors are not addressing ambisonics - but the Fourier 
Bessel coefficients are somewhat related.


On 02/29/2012 06:28 AM, Fons Adriaensen wrote:



Two possible methods have been published.

The first is Franz Zotter's work, using an 'almost regular' virtual layout 
based on
t-designs for which a decoder can be designed in closed form. Then the virtual 
set
of speakers is mapped onto the real one using VBAP. As far as I know there is no
'ready to use' toolset for this method.

The second is the subject of BLaH paper #4, and is based on using a non-linear
optimisation toolset to find a solution, given the error constraints and weights
for a set of performance metrics. I developed more or less the same (even using
the same freely available non-linear library), but wasn't allowed to publish the
results, so I can confirm this can work rather well. What looks like a practical
implementation (by B,L&  H) of this method is scheduled for presentation at the
next Linux Audio Conference at CCRMA.

I don't think either method can be used 'blindly', in the sense that you just
throw a set of speaker coordinates at it and get a guaranteed result. You
will have to evaluate the results, and you may have to decide on tradeoffs
and iterate the procedure using modified parameter sets. At this point you
will need some familiarity with the internals in order to be able to proceed.

Ciao,



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Re: [Sursound] cross-talk cancellation used in binaural sound reproduction

2011-02-24 Thread D. Sen

Hi,

There is Edgar Choueiri's work:

http://www.princeton.edu/3D3A/BACCH_intro.html

Deep

On 02/24/2011 07:11 PM, Junfeng Li wrote:

Hello, all friends,

Is anyone working on binaural sound reproduction using loudspeakers?
To reproduce 3D sound using loudspeaker, cross-talk cancellation is needed,
as I know.
Does anyone know which the most-advanced cross-talk cancellation
technique/algorithm?
Does anyone have a sample program (source code) of binaural reproduction
using loudspeaker, which can share with me?

Great appreciation to all you.

Best regards,
Junfeng
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