[Speex-dev] echo canceller
jean-marc.valin at usherbrooke.ca
Tue Dec 20 21:36:51 PST 2005
> 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.
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