[Speex-dev] Re: AEC frame size

ranjan ranjan at gisil.com
Mon Jun 26 05:09:11 PDT 2006

Jean-Marc Valin <Jean-Marc.Valin <at> USherbrooke.ca> writes:

> Le mercredi 07 juin 2006 à 10:03 +0000, shridhar desai a écrit :
> >   
> > hi all,
> > i am using the Acoustic Echo Cancellation from  "Speex 1.1.12 version"
> > in  my VOIP application. Is it that the  frame length to be chosen
> > should always be 20ms or can i have flexibility in chosing the frame
> > lenght?
> > on what parameters does the frame length choise depends?
> > thank you all,
> > Shri.
> 20 ms is usually a good idea, but you can use shorter (I don't recommend
> much longer). In any case, just try it and see if it works for you.
> 	Jean-Marc

Hi Jean-Marc,

I am using speex-1.1.12 version AEC with the following configuration
FRAME LENGTH: 32 , i.e. 4msec(125usec*32)
TAIL LENGTH : 256 , 32msec
I have configured AEC for ARM-920T, 200MHz

Here are my observations
[a] AEC CPU usage 50%
[b] Still 10%trace of echo is still present
NOTE: I am not using preprocessor as my cpu usage goes upto 99%

What should i do to increase the efficiency of AEC

Thanks in advance
Ranjan Srivastava

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