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speex_preprocess
2011 May 25
1
pre-processor's residual echo suppression and AEC order
Hi,
Arun and me are working on a echo-canceler module for pulseaudio build around
speex. When using the preprocessor's echo filter, specifically in combination
with denoise and AGC, it's unclear whether these have to run before or after
the AEC.
Right now we've got one instance of speex_preprocessor doing AGC and denoise
running before the echo canceler; and a second for echo suppression after the
echo canceler. This seems to have effect, but we have not tested the total
quality of this configuration yet.
In the code however preprocessor.c compute_gain_floor() both noise and echo
variable...