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Unread 09-03-2010, 11:50 AM   #1
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Default echo cancellation

I am developing an IP Phone on ARM(samsung 6410; CPU:667MHZ), and use lib

mediastreamer.2.6.0 for audio
communication, but now the echo occur while talking. In the lib

mediastreamer.2.6.0, I find a filter can
do echo Cancellation by calling lib speex. I active it to filter the

collected voice, but the telephone
receiver can't hear any voice. Maybe I setup parameters wrong, the

parameters are as follow:

int ec_tail_len = 100;
int ec_delay = 20;
int ec_framesize = 0;
if (use_ec) {

//inec_tail_len = 100;
//ec_delay = ;
if (ec_tail_len!=0)

if (ec_delay!=0)

if (ec_framesize!=0)


Expecting anybody can give me some advices to cancel the hateful echo.
Best regards!
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