Speex dev - Jan 2009 - AEC question

Please,

I noticed in the AEC module documentation that I can set the sampling 
rate and the frame size (in samples), but I found nothing regarding to 
the number of channels, no SET and no GET...
So, I 'd like to know how I setup the channel's count on AEC.. if the 
buffer passed to the echo cancellation function should be mono or stereo...

Another question:

Is there a preferred sampling rate where the AEC algorithm works better ?
The frame size should be between 10-20 ms, right ?

Thank you very much,
Daniel

Daniel a ?crit :
> I noticed in the AEC module documentation that I can set the sampling 
> rate and the frame size (in samples), but I found nothing regarding to 
> the number of channels, no SET and no GET...
The number of channels is set right at init time using
speex_echo_state_init_mc() instead of speex_echo_state_init(). You need
rc1 for that.
> So, I 'd like to know how I setup the channel's count on AEC.. if
the
> buffer passed to the echo cancellation function should be mono or stereo...
It's mono by default (if you use speex_echo_state_init()).
> Another question:
> 
> Is there a preferred sampling rate where the AEC algorithm works better ?
> The frame size should be between 10-20 ms, right ?
The AEC has received more testing at 8 kHz, but it should work at other
rates, up to 48 kHz. However, for the *fixed-point* version, I recommend
8 kHz because the other rates have received no testing.

	Jean-Marc
> Thank you very much,
> Daniel
> 
> 
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