[Speex-dev] Forward of moderated message

Jean-Marc Valin jean-marc.valin at usherbrooke.ca
Sat Feb 7 10:51:17 PST 2009

> The echo cancellation with Speex seems to be working well in some calls,
> but during a voice call with a laptop that has a built-in microphone the
> echo is quite loud.  In other calls without the built in microphone,
> only some intermittent residual echo can be heard.  I have noticed,
> without the preprocessor residual echo cancellation, there is loud echo.  

Define loud. What's the attenuation?

> The echo_diagnostic script for Octave shows a good delay (151 samples).
>  The play/rec/out .sw files are attached.  Please provide any insight on
> how to improve the echo cancellation.  The render/capture is done on one
> sound card.  

The play file never made it.

> Also, the drift estimate is either 0% or 0.131% (80 samples), I never
> get any other value.

A drift of 80 samples looks suspicious. That would mean something like a
frame got dropped there's nothing the AEC can do to reciver from that.


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