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On Wed, Feb 29, 2012 at 01:15:40PM +, Miguel Negrao wrote:
I’ve been a bit disconnected from the ambisonics world. From my past reading
on this list it is my understanding that there isn’t an explicit formula for
decoding coefficients for non-symmetrical setups. Are there currently
There's a third method - Bruce Wiggins' Heuristic algorithm based methodology
(http://www2.derby.ac.uk/sparg-content/pdfs/bw_aes31_paper.pdf). This is, I believe, available in
his Wigware decoder plugins.There is also some work from China on genetic algorithm based design,
but I don't know what
Ah - I withdraw that about the Wigware decoders as the versions on Bruce's website are probably not
sufficiently flexible for your purposes, though the actual heuristic methodology probably is.
Dave
On 29/02/2012 14:47, Dave Malham wrote:
There's a third method - Bruce Wiggins' Heuristic
...
URL:
https://mail.music.vt.edu/mailman/private/sursound/attachments/20120229/3675d289/attachment.html
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On 02/29/2012 08:16 PM, Paul Power wrote:
The problem
with the 2nd order decoder is that the final gains given do not give
negative phase for the diametrically opposed speaker. I have also tried using a
regular shaped speaker set up, but this still does not give me negative phase
in the
Thanks for all the answers. Since I really looking for a method I could use
more or less blindly, I guess for the moment I will not dive more into it. I
would be interested the tools that Eric mentions when they are released.
Would an automated “blind search algorithm possibly give worse
On Wed, Feb 29, 2012 at 07:16:18PM +, Paul Power wrote:
I am a currently looking into Ambisonic periphonic systems.
This is my first post so please go easy on me. I am currently using a 16
speaker rig which includes a cube and an octagon set up. I understand that
this
is not a regular
On Wed, Feb 29, 2012 at 08:36:45PM +0100, Jörn Nettingsmeier wrote:
On 02/29/2012 08:16 PM, Paul Power wrote:
The problem
with the 2nd order decoder is that the final gains given do not give
negative phase for the diametrically opposed speaker. I have also tried
using a
regular shaped
I think the problems of using less-than-perfect decoders are easily
overshadowed in the concert situation by the fact that almost all listeners are
sitting quite outside the sweet spot; precision in imagery just isn't going to
be there.
Using higher orders with sub optimal decoders would yield
On Wed, Feb 29, 2012 at 08:55:05PM +, Miguel Negrao wrote:
Would an automated “blind search algorithm possibly give worse
results then just using the equations for the symmetrical case ?
I know many people using ambisonics for eletroacoustic music and
I think all of them use the
Bruce Wiggins's (I hope) research was what started this fray out in the first
place
Yup. And several others. But the point is that there is a good deal more to
be
done, especially as you point out that:
this sort of optimization retains the blackbox leanings of machine learning
as
a
Dang. Have written all that, I should add that though the code works at
higher orders, the player only supports formats up to third order (the game
engine actually goes up to fourth right now). And rather fatally for
Miguel's purposes, the decoder generator doesn't allow the coefficients to
be
A 29/02/2012, às 21:24, Fons Adriaensen escreveu:
On Wed, Feb 29, 2012 at 08:55:05PM +, Miguel Negrao wrote:
Would an automated “blind search algorithm possibly give worse
results then just using the equations for the symmetrical case ?
I know many people using ambisonics for
On Wed, Feb 29, 2012 at 5:19 PM, Sampo Syreeni de...@iki.fi wrote:
Personally what I find a bit worrisome is that this sort of optimization
retains the blackbox leanings of machine learning as a general discipline.
None of the ambisonic specific, closed form optimization literature, or the
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.
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