[Speex-dev] AEC: Tips on signal synchronization.

Marco Pierleoni pierleoni.m at gmail.com
Wed Dec 30 04:06:02 PST 2009

The problem is that now I have two files very similar (one for mic, the
other for speaker).
If I play them together I can hardly say that they are two different file
for most of the file length.

When I try to cancel the echo, I obtain as output almost the same input.
The update_foreground variable is always 0. I don't get the conditions which
must be fulfilled in order to have update_foreground=1.
I see that there is some energy comparison, but I don't get the physical
meaning of all the components.
Is it normal to get always 0?
If the track are into alignment, are there other tracks' properties to
consider in order to get a good echo cancellation? Maybe the audio quality?
or the relative volume?

Thanks for any help.

Marco Pierleoni.
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