[Speex-dev] AEC params

[Suchibrata Kar]

Hi:

I have been trying to test the speex AEC by playing a
voice sample (pre-recorded) as a echo and capturing a
new voice sample and playing the pre-recorded one, for
reference. [Sampling rate 8 KHz, frame size 64]

For some reason, I dont see any removal of echo. Does
anybody have a idea of * Testing the AEC in some other
mechanism
or
* Getting some sample files for testing AEC

Thanks
Su


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

> Le lundi 12 décembre 2005 à 02:57 -0800, Suchibrata
> Kar a écrit :
> > Hi:
> > 
> > Can anyone give some insight on:
> > 
> > 1) As per the Speex manual, there is a mention of
> the
> > relationship between input frame and echo frame
> (Pg
> > 19, Para 2). I was wondering of what would be the
> > ideal delay between these two frames, so that the
> echo
> > is already fed to the canceller and the echo
> > cancellation filter is not inefficient.
> 
> Smallest as possible as long as your 100% sure that
> it's positive. In
> practice, half a frame is good.
> 
> > 2) Corresponding to the above mentioned delay,
> what
> > filter length should we define while creating the
> echo
> > canceller state so that we can expect the AEC to
> > remove or reduce the echo.
> 
> So far, my rule of thumb is to use about half of the
> 60 dB reverberation
> time. For example, in a small room, the
> reverberation time is in the
> order of 250 ms, so a tail length of 125 ms would be
> good.
> 
> 	Jean-Marc
> 


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