[Speex-dev] AEC seems to distort voice

[Niels Werensteijn]

Hi,

I've set up speex AEC in our application. The echo's seem to be
canceling, but the captured voice is distorted somehow. It sounds to me
like low and/or high frequencies are removed. This happens even if I set
my playback(echo) data to only zero's.

Is this "normal" for the AEC? As far as I understand, if I send 0's as
playback/echo data, the resulting data should be the same as the echo data?

My chain is like this:

1. get playback and capture data
2. down sample both to codec rate
3. do echo cancellation
4. do pre processing (using speex. The preprocessor also does residual
echo cancelling because i called
"speex_preprocess_ctl(m_pSpeexPreprocessState,
SPEEX_PREPROCESS_SET_ECHO_STATE, m_EchoState)")
5. encode and send data over network.

-- 
Regards,
Niels Werensteijn