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...ing very similar. I implemented it starting from a FFT library. It is quite easy to do. > > I am currently trying to find one. But if you could point me to one it will > reduce my search time. :) > > Many Thanks, > > Elston > > -----Original Message----- > From: Marco Pierleoni [mailto:pierleoni.m at gmail.com] > Sent: Tuesday, May 11, 2010 5:55 PM > To: Elston Sa > Cc: speex-dev at xiph.org > Subject: Re: [Speex-dev] AEC - Echo is cancelled however..... > > I usually use the cross-correlation between the speaker signal and the > mic signal. > It w...

..., but I don't get the physical meaning of all the components. Is it normal to get always 0? If the track are into alignment, are there other tracks' properties to consider in order to get a good echo cancellation? Maybe the audio quality? or the relative volume? Thanks for any help. Marco Pierleoni. -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.xiph.org/pipermail/speex-dev/attachments/20091230/dabc69ed/attachment.htm

...nceller on the first stream there is perfect echo cancellation and on the second stream the echo is subdued. The echo is not very audible unless you listen at high volume. Although this is acceptable, I would like to know if you see similar issue. -Elston -----Original Message----- From: Marco Pierleoni [mailto:pierleoni.m at gmail.com] Sent: Tuesday, May 11, 2010 7:30 PM To: Elston Sa Cc: speex-dev at xiph.org Subject: Re: [Speex-dev] AEC - Echo is cancelled however..... 2010/5/11 Elston Sa <jose at rebaca.com>: > Is there an API in speex or have you implemented your own? I don't...

.... Marco 2010/5/11 Elston Sa <jose at rebaca.com>: > Marco, > > Thank you for your response. > > Is there a way I can determine if the synchronization is perfect or not? If > not by how much it is off. > > - Elston > > -----Original Message----- > From: Marco Pierleoni [mailto:pierleoni.m at gmail.com] > Sent: Monday, May 10, 2010 3:46 PM > To: Elston Sa > Subject: Re: [Speex-dev] AEC - Echo is cancelled however..... > > Hi Helton, > > it is now several months that I am using the AEC speex. I experienced > very good performance and I agree...

...e person managing the list at > speex-dev-owner at xiph.org > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of Speex-dev digest..." > > > Today's Topics: > > 1. AEC: Tips on signal synchronization. (Marco Pierleoni) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Tue, 29 Dec 2009 17:38:49 +0100 > From: Marco Pierleoni <pierleoni.m at gmail.com> > Subject: [Speex-dev] AEC: Tips on signal synchronization. > To: speex-dev at xip...

Is there an API in speex or have you implemented your own? I am currently trying to find one. But if you could point me to one it will reduce my search time. :) Many Thanks, Elston -----Original Message----- From: Marco Pierleoni [mailto:pierleoni.m at gmail.com] Sent: Tuesday, May 11, 2010 5:55 PM To: Elston Sa Cc: speex-dev at xiph.org Subject: Re: [Speex-dev] AEC - Echo is cancelled however..... I usually use the cross-correlation between the speaker signal and the mic signal. It works pretty well. The problem is the y...

...lf method call? Is it this value important for obtaining a smaller time to let the filter adapt? or filter adapting depends only on the ratio frame_size/filter_length? I will be grateful for every more info that you can give me in order to understand better the role of frame_size algorithm. Marco Pierleoni -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.xiph.org/pipermail/speex-dev/attachments/20091216/b7539a72/attachment.htm

...ync? - I read the papers cited in the code, but I cannot understand completely how the algorithm works and adapts; do you have any available references to suggest in order to have a better understanding and to try to obtain an echo cancellation in these bad situations? Thanks for your help Marco Pierleoni. -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.xiph.org/pipermail/speex-dev/attachments/20091229/83c81c63/attachment.htm

...e you shifted the signal too much. If the mic signal is just one single sample *ahead* of the playback signal, then there's no cancellation possible (because the system is not causal). Be careful with that. Otherwise, if could simply be dropped frames. Jean-Marc On 2009-12-30 07:06, Marco Pierleoni wrote: > The problem is that now I have two files very similar (one for mic, the > other for speaker). > If I play them together I can hardly say that they are two different > file for most of the file length. > > When I try to cancel the echo, I obtain as output almost the same i...

Marco, Thank you for your response. Is there a way I can determine if the synchronization is perfect or not? If not by how much it is off. - Elston -----Original Message----- From: Marco Pierleoni [mailto:pierleoni.m at gmail.com] Sent: Monday, May 10, 2010 3:46 PM To: Elston Sa Subject: Re: [Speex-dev] AEC - Echo is cancelled however..... Hi Helton, it is now several months that I am using the AEC speex. I experienced very good performance and I agree that the synchronization is the most...

1) Everytime a participant speaks there is a echo for a short duration (maybe a word or two) but as the participant continues to speak without a any break the echo is 95% cancelled (i.e there is a feeble echo still present if observed very carefully). 2) The moment the participant stops / pauses speaking and start talking again, scenario 1 is repeated as if the echo state has been re-initialized