Speex dev - Sep 2007 - Speex echo canceller creating some problems. No voice coming.

Hi,

 

I am new to speex so please redirect me to some links if the question is
repetative.

 

Just for testing the echo canceller performance, I have added
mdf,fftwrap,misc,kiss_fftr,kiss_fft source files to my project.

 

Now In my multithread application when I receive packets from mice, I calls 

speex_echo_capture(echo_state, input_frame, output_frame,Youtput_frame)

 with input_frame as data received from mice(160 bytes as I am using G711
codec) and I send data out received from second argument output_frame.

 

Also when I get packet to play from remote(far) end, I calls 

speex_echo_playback(echo_state, echo_frame) 

with arrived data.

 

If I do not pass my data through these APIs I am getting voice on both side
correctly but when I use these APIs I am getting just noise on both sides. I
am getting packets on both side that is sure.

 

The noise is not just any random noise but its in the pattern of
silance-noise. Just like following:

_____^_____^_____^_____^_____^_____^_____^_____^_____^_____^_____^_____^____
_^_____^_____^_____^ 

Where [____-> silance ^->Noise]

 

Which seems to me as uniform.

 

I had just created an echo_state variable prior to creating these two
classes that manages Receive side and send side and I am using common
instance of echo_state between these two classes.

 

Am I doing anything wrong here? I have tried setting frame_size with 20,160
and frame_filter_length as 100,256,300 etc but I found no success here.

 

Can anyone please suggest me anything? I am using WM5 devices on both end.
Is there anything that this echo canceller will work with speex codec only?
Do I need to do anything special that I am missing? 

 

Regards,

Digish Gabhawala [mailto: digish@varaha.com]

 

 

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