回复： Re: [Speex-dev] echo canceller

[wu xudong]

I have tested the AEC by file model,but found it
doesn't work!The output file I got still had echo.
And I have found several version of mdf.c,could you
tell me which version I should use?
Now I'm using version 1.11.1.1 and under windows there
have some bugs.

--- Jean-Marc Valin
<jean-marc.valin at usherbrooke.ca>写道:

> 
> > haven't got the chance to sit down and look into
> it.
> > from what I read in the list, double talk
> detection is 
> > in the pipeline... :D. Just 2 quick questions: 
> > i) does this canceller handle wideband for speex
> wideband?
> 
> It should, but I haven't tested it (might require a
> bit of tuning).
> 
> > ii) does it handle feedback or howling?
> 
> Not explicitly, but just cancelling echo would
> hopefully reduce that
> (the preprocessor even more).
> 
> > Lastly, a newbie question for echo cancellation:
> > is there a convenient test to ensure that the
> input and 
> > output buffers obtained from the audio IO
> > are aligned?  
> 
> Save two files, look at waveform.
> 
> > and also, does anyone have any rough
> > idea what is the tolerated misalignment of the
> input and 
> > output buffers, assuming constant misalignment
> 
> Less then one frame size is best. More than the echo
> tail and you've got
> no cancellation at all.
> 
> 	Jean-Marc
> _______________________________________________
> Speex-dev mailing list
> Speex-dev at xiph.org
> http://lists.xiph.org/mailman/listinfo/speex-dev
> 


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