[Speex-dev] Echo cancellor on Windows, a few questions.

Jean-Marc Valin jean-marc.valin at usherbrooke.ca
Thu Dec 6 06:29:40 PST 2007

> Q1. is there a way to determine if the echo cancellor managed to lock in
> or not?

Not really. Defining "locking in" is probably as hard as actually
figuring out a test for it.

> Q2. does anybody have a working code with wave apis?

Not me.

> Q3. is the speech processor necessary for the echo cancellor to work?
> what is the difference between 'echo' and the 'residual echo' that the
> preprocessor is suppoed to cancel?

residual echo is what's left after the echo canceller. i.e. you can use
the preprocessor to improve the result from the echo canceller, but if
you're satisfied with the echo canceller alone, no need for the


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