[Speex-dev] pre-processor's residual echo suppression and AEC order
bart.cerneels at collabora.co.uk
Wed May 25 05:49:06 PDT 2011
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
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
variables, suggesting these belong together in the same instance.
So is speex_preprocess_run always supposed to be run *after*
speex_echo_cancellation, does it perhaps depend on which filter function is
More information about the Speex-dev