[Speex-dev] AEC - Echo is cancelled however.....

Mark Pietras mpietras at yahoo.com
Mon May 10 05:40:12 PDT 2010

For what it's worth, I experience the same exact thing in my application... both the ~95% cancellation rate and the loss of convergence mid-stream.  I don't know why the AEC "resets" between the pauses in speaking and seems to have to reconverge from scratch every time... seems to me it should attempt to hold the same convergence throughout the lifecycle of the stream once it finds it since the echo shouldn't change much... but I'm certainly no expert... Mark.

From: Elston Sa <jose at rebaca.com>
To: speex-dev at xiph.org
Sent: Mon, May 10, 2010 4:40:47 AM
Subject: [Speex-dev] AEC - Echo is cancelled however.....

1) Everytime a participant speaks there is a echo for a short duration
(maybe a word or two) but as the participant continues to speak without a
any break the echo is 95% cancelled (i.e there is a feeble echo still
present if observed very carefully). 
2) The moment the participant stops / pauses speaking and start talking
again, scenario 1 is repeated as if the echo state has been re-initialized
or reset.

Please note that I observe this in a single audio session and not after
restarting the application. I confirm that I am not re-initializing the echo
state after the session starts. 

Is this normal? Is there any way I can keep the echo state to what it was
when the participant not speaking.

Also, any pointers on why I get a feeble echo back would be greatly



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