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...eakers. If the > speakers are not at the exact same distance from the mic, you will get more > than one echo. AEC can not handle that. Try disconnecting all but one > speaker and see if it makes any difference. > > cheers > Greger > > 2010/3/15 Anton A. Shpakovsky <saa at tomsksoft.com> > > > Hello. > > > > 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 > &g...

...les ( far end signal and far end echo + near end signal) the not working two files ( far end signal and far end echo + near end signal) HyeeWang > ------------------------------ > > Message: 4 > Date: Tue, 17 Nov 2009 14:56:00 +0600 > From: Pavel Novodon <npd at tomsksoft.com> > Subject: [Speex-dev] AEC strange behaviour > To: speex-dev at xiph.org > Message-ID: <4B026520.2040106 at tomsksoft.com> > Content-Type: text/plain; charset=windows-1251; format=flowed > > Hello. > I have the following situation. AEC is used in network chat soft...

Hello. 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

...st Echo canceller state rec signal from the microphone (near end + far end echo) out Returns near-end signal with echo removed ---------------------------------- thanks & regards, Chris Adoremos On Wed, Sep 29, 2010 at 5:46 PM, Anton A. Shpakovsky <saa at tomsksoft.com>wrote: > Hi > > > > Yes, it's absolutely unnecessary to use speex codec. You can encode the > echo cancelled auido data with any codec you want. > > The Echo Canncelation API is here - > http://www.speex.org/docs/api/speex-api-reference/group__SpeexEchoState.h...

...ou > will get more > > than one echo. AEC can not handle that. Try disconnecting all but one > > speaker and see if it makes any difference. > > > > cheers > > Greger > > > > 2010/3/15 Anton A. Shpakovsky <saa at tomsksoft.com > <mailto:saa at tomsksoft.com>> > > > > > Hello. > > > > > > I have the following situation. AEC is used in network chat > software > > > > > > over DirectSound API. Echo and reference sign...

...eaking again in a single session. I am using a laptop with standalone speakers. For echo cancellation to work one has to make sure that the ref and echo buffers are synchronized. I guess this is the most common problem. -Elston -----Original Message----- From: Anton A. Shpakovsky [mailto:saa at tomsksoft.com] Sent: Monday, May 10, 2010 2:43 PM To: Elston Sa; speex-dev at xiph.org Subject: RE: [Speex-dev] AEC - Echo is cancelled however..... Well, AFAIK AEC engine needs time to adapt. So probably that's why at the beginning of the conversation you hear the consequences of this adaptation. Btw,...

...distance from >>> the mic, you will get more than one echo. AEC can not handle >>> that. Try disconnecting all but one speaker and see if it makes >>> any difference. >>> >>> cheers Greger >>> >>> 2010/3/15 Anton A. Shpakovsky<saa at tomsksoft.com> >>> >>>> Hello. >>>> >>>> I have the following situation. AEC is used in network chat >>>> software >>>> >>>> over DirectSound API. Echo and reference signals are almost >>>> aligned >>>&gt...

...speakers. For echo cancellation to > work >> one has to make sure that the ref and echo buffers are synchronized. I > guess >> this is the most common problem. >> >> -Elston >> >> -----Original Message----- >> From: Anton A. Shpakovsky [mailto:saa at tomsksoft.com] >> Sent: Monday, May 10, 2010 2:43 PM >> To: Elston Sa; speex-dev at xiph.org >> Subject: RE: [Speex-dev] AEC - Echo is cancelled however..... >> >> Well, AFAIK AEC engine needs time to adapt. So probably that's why at >> the beginning of the conversatio...

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

As for me - speex_echo_cancellation is a better choise. Try using it in capture thread instead of those speex_echo_capture and speex_echo_playback functions. And please, describe your problem in details. Cause the fact that you "didn get echo cancellation" doesn't mean you are doing smth wrong. Regards, Anton A. Shpakovsky -----Original Message----- From: speex-dev-bounces at

...o spectrum or other physical/math parameters of samples itself. Please, answer whether it is possible or not. I can provide recorded dumps so you can test it yourself. This is very crucial situation for our software and now we're stuck with it. Paul Novodon Sr. software multimedia developer TomskSoft LLC.

...of is if you are using two or more speakers. If the speakers are not at the exact same distance from the mic, you will get more than one echo. AEC can not handle that. Try disconnecting all but one speaker and see if it makes any difference. cheers Greger 2010/3/15 Anton A. Shpakovsky <saa at tomsksoft.com> > Hello. > > 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...

...the exact same distance from the mic, you will get > more > > than one echo. AEC can not handle that. Try disconnecting all but one > > speaker and see if it makes any difference. > > > > cheers > > Greger > > > > 2010/3/15 Anton A. Shpakovsky <saa at tomsksoft.com> > > > > > Hello. > > > > > > 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). W...

...re not at the exact same distance from the mic, you will get more >> than one echo. AEC can not handle that. Try disconnecting all but one >> speaker and see if it makes any difference. >> >> cheers >> Greger >> >> 2010/3/15 Anton A. Shpakovsky <saa at tomsksoft.com> >> >>> Hello. >>> >>> 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...

...l but you didn't answered. I'm starting to investigate this problem in a couple of days, and I really want to hear from you if you faced the described problem earlier and know the solution. Looking forward to hearing from you, Anton A. Shpakovsky Multimedia Software Developer TomskSoft LLC. -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.xiph.org/pipermail/speex-dev/attachments/20100301/e35c1543/attachment-0001.htm

...>> work >>> one has to make sure that the ref and echo buffers are synchronized. I >> guess >>> this is the most common problem. >>> >>> -Elston >>> >>> -----Original Message----- >>> From: Anton A. Shpakovsky [mailto:saa at tomsksoft.com] >>> Sent: Monday, May 10, 2010 2:43 PM >>> To: Elston Sa; speex-dev at xiph.org >>> Subject: RE: [Speex-dev] AEC - Echo is cancelled however..... >>> >>> Well, AFAIK AEC engine needs time to adapt. So probably that's why at >>> the begi...

Anton A. Shpakovsky <saa <at> tomsksoft.com> writes: > > As for me - speex_echo_cancellation is a better choise. Try using it in > capture thread instead > of those speex_echo_capture and speex_echo_playback functions. > > And please, describe your problem in details. Cause the fact that you > "didn get ec...

...st Echo canceller state rec signal from the microphone (near end + far end echo) out Returns near-end signal with echo removed ---------------------------------- thanks & regards, Chris Adoremos On Wed, Sep 29, 2010 at 5:46 PM, Anton A. Shpakovsky <saa at tomsksoft.com> wrote: Hi Yes, it's absolutely unnecessary to use speex codec. You can encode the echo cancelled auido data with any codec you want. The Echo Canncelation API is here - http://www.speex.org/docs/api/speex-api-reference/group__SpeexEchoState. html I would advice you to look at spe...

...t; I am using a laptop with standalone speakers. For echo cancellation to work > one has to make sure that the ref and echo buffers are synchronized. I guess > this is the most common problem. > > -Elston > > -----Original Message----- > From: Anton A. Shpakovsky [mailto:saa at tomsksoft.com] > Sent: Monday, May 10, 2010 2:43 PM > To: Elston Sa; speex-dev at xiph.org > Subject: RE: [Speex-dev] AEC - Echo is cancelled however..... > > Well, AFAIK AEC engine needs time to adapt. So probably that's why at > the beginning of the conversation > you hear the cons...

Hi Is it possible to use only the speex echo cancellation module w/o using the speex codec? Here's the scenario: 1. I have my voice recorded in PCM audio file format 2. I want to cleanup the recorded voice by removing any echo included in the audio file/buffer 3. can I just use the ff APIs? - SpeexEchoState* speex_echo_state_init() - int speex_echo_ctl() - void speex_echo_capture()