Hello all, How to take care if the echo path has a gain. (no more erl) Thanks, Prabhu. --- "Shaw, David G (David)" <> wrote: > From experience you should not count on echo > cancellation > like you expect from the LEC numbers you may be > familiar with. > Measure the microphone noise floor and make sure > that your > residual error is not dominated by it. > It is VERY, VERY hard to reach 30dB from just the > AEC. > Issues: dynamic range (immediate echo vs local > talker levels), > dynamic echo path, noise floor, lack of tail length, > noise > floor of the sub-band filters (if used) etc. > > Regards, > Dave > > -----Original Message----- > From: andrew_xiang [mailto:] > Sent: Friday, September 12, 2003 10:58 AM > To: > Subject: [echocancel] acoustic echo cacellation > performance? > Anyone implemented a system that get you 30dB of > reduction for AEC? > > In my system, I only get 4X for voice signal. I will > give it a try > with white noise. But seems 30X is far away. But I > don't expect users > to utter white noise when they speak. > > My calculation: > > 4X=SUM(abs(microphone))/SUM(abs(error)) > > 4X leaves me a lot of residual. > > Are there other tricks in increasing the reduction? > > thanks > Andrew > _____________________________________ > Note: If you do a simple "reply" with your email > client, only the author of > this message will receive your answer. You need to > do a "reply all" if you > want your answer to be distributed to the entire > group. > > _____________________________________ > About this discussion group: > > To Join: > > To Post: > > To Leave: > > Archives: > http://www.yahoogroups.com/group/echocancel > > Other DSP-Related Groups: http://www.dsprelated.com > ">http://docs.yahoo.com/info/terms/ > __________________________________ |