[Speex-dev] AEC strangest behavior

Anton A. Shpakovsky saa at tomsksoft.com
Mon Mar 15 02:59:23 PDT 2010


I have the following situation. AEC is used in network chat software 

over DirectSound API. Echo and reference signals are almost aligned 

(delay is no more than 30ms). When echo is emulated in notebook 

(built-in speakers + mic) everything goes fine and echo is cancelled. 

But when configuration includes stand-alone speakers and mic no echo is 

removed. Audio is in 22050 hz at 16 bit mono format, number of samples 

to process were 441 and tail was used 4096.


Dumps are here:

nb_*** - working configuration (notebook)

sa_*** - standalone speakers with no echo removed


Can it be because of differences in fixed and arbitrary acoustic

I will appreciate any of your advises or thoughts.




Anton A. Shpakovsky

Multimedia Software Developer


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