[Speex-dev] AEC with different soundcards

ggb ggb at tid.es
Tue Jul 7 06:14:24 PDT 2009

Thank you John.

On 07/06/2009 11:03 PM, John Ridges wrote:
> ly synchronized, and therefore the clock drift adds a non-linear
> factor to the audio path. The AEC can only cancel linear changes to the
> audio path, and so the AEC never converges.
Is this a limitation common to all the AEC implementations/algorithms, 
or just the speex one?
> One solution is to measure
> the clock drift and resample either the input or output signal so that
> they*are*  synchronized, and then the AEC can converge. It's not fun,
> but it works.
Could you detail me how to measure the clock drift?  Any pointer to doc 
or example?

I apologize for my lack of knowledge in this topic,
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