[PD] Cubemixer with hdsp and 8 lodspeakers?

[Roman Haefeli]

hi rodrigo

afaik, the number of speakers for an ambisonic installation doesn't matter, 
since you first compute an ambisonic sound in the B-Format, which has always 
4 channels, iirc. once you have the b-format computed, you can use it for 
several configurations of loudspeakers, but you'll have to measure the 
position of each loudspeaker and then compute the signal for each speaker 
accordingly.

i don't know the cubemixer of iem, but the website 
(http://iem.at/projekte/acoustic/awt/abcde/project_view) says:

"Dabei wird nach dem ambisonic-Prinzip eine mehrkanalige 
lautsprecherunabhängige Repräsentation eines periphonen Schallfeldes 
generiert (Encodierung), und diese anschließend über ein bestimmtes 
Lautsprechersetting (Hemisphere) wiedergegeben (Decodierung)."

for me it sounds that you can use the cubemixer to compute ambisoncics 
b-format (encoding). so you could do the decoding afterwards for your 
special configuration, which has 8 instead of 16 speakers.

have a look also at:
http://www.york.ac.uk/inst/mustech/3d_audio/ambis2.htm
which tries to explain the math of ambisonics

afaik, the ICST in zurich sometimes gives lessons for an introduction into 
ambisonics. that might be interesting for you....

roman





Rodrigo <rodrigo at anorg.net> wrote:


> hi all!
>
> I'm trying to make an ambisonic installation and I can dispose of 8 aktive
> genelec lodspeakers and an rme multiface card (8 outputs). Since I'm not
> an expert in the issue, it would be great if someone could answer the
> questions below or point me to the right direction (there's a lot of stuff
> about this around, and I'm a little disoriented!).
>
> I'm taking a look at the Cubemixer (
> http://iem.at/projekte/acoustic/awt/abcde/project_view), and it seems like
> everything I need is already implemented there. But from what I've read,
> it looks like it is implemented for 16 Loudspeakers an an rme 9632. Is it
> possible to do it only with 8? What would be the ideal position of the
> speakers then? What configuration changes do I have to do, and which
> output channel gets assigned o what speaker? What do I have to do to use
> the hdsp instead of the rme 9632? First of all, it is important for me to
> know if its possible to reconfigure the cubemixer to do this, and how much
> work in your opinion would it take. If not, perhaps you know some other
> way to do ambisonics with the equipment I have.
>
> thanks a lot in advance!
>
> cheers,
>
> rodrigo


		
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