search for: echo_cancellation

Hi Jean-Marc, For the residue in the echo_cancel function I pass in a pointer to an array of floats. First I used an array the size of the framesize, but I discovered this causes crashes because the echo_cancel funtion writes framesize+1 floats to the pointer. I find this plus one strange, since almost all things are exactly the framesize. Is this an error in the echo_cancel function or simply

...echo cancelled, and then encoded in G.711. As such, I'm really interested in the echo cancellation component of Speex, but not in the encode/decode. Finally, only one channel of audio needs to be echo cancelled in the system. So, here come the questions. :-) 1. Is it possible to call speex_echo_cancellation() on audio frames not already encoded in Speex? 2. Can anyone compare / contrast the features of Speex's echo cancellation versus those of, say, Ittiam (http://www.ittiam.com/pages/products/aec.htm ) or Adaptive Digital? (http://www.adaptivedigital.com/product/echo_cancel/adt_aec.htm) Obvio...

Please, I'm looking at speex rc1 echo_cancellation API docs and I found there is now a funcion for doing decorrelation: void speex_decorrelate( SpeexDecorrState * st, const spx_int16_t * in, spx_int16_t * out, int strength) How does it fit to the speex_echo_cancellation function ? When removing echo from multiple channels I nee...

...k+samples from yesterday's cvs with an ISDN card (passive, Cologne HFC chipset, HiSax driver). When I leave a voicemail for extension 1234 the echo is horrible. Is there a way to reduce the echo in this setup? Probably buying a decent card like an Eicon Diva PCI and use chan_capi drivers with echo_cancellation=on would improve things but I do not have that card right now :) Thanks, Patrick

...can help me to find a reliable solution. Right now I am working on two recorded audio track where the mic and the speakers are both in sync or out of sync in different parts of the files. I am trying to perform the synchronization, using the cross-correlation, on each frame before to pass on the echo_cancellation. In particular the parameters of cancellation will be the frame taken from the mic file, and the frame from the speaker files which better cross-correlated with the mic frame. The result is not very different from the output without synchronization. So my questions are: - Do you think that an app...

All I can say for now is that: 1) My diagnostic tool does funny things that need to be fixed 2) It was probably also getting confused by the clicks at the end of the files 3) There seems to be odd things with your recordings, though I can't say what that would be. Are you changing something during the recording by any chance? Note that if a person close to the mic of speaker moves, that

> Thanks for the great work. It indeed helps to diagnose of echo > canceller and narrow down the > problem area. Good, so it worked for you? > I am not an expert in the signaling processing but I > wonder if it is possible > to add the linearity check in the echo_diagnostic function? Theoretically, yes. In practice, I'm not sure how accurate it would be. Do you have any

Hi, To solve echo problems, I'm considering 2 alternatives. 1> Sangoma A104d - I can't find support for asterisk 1.2.1 2> Desktop echo canceller - http://www.oriontelecom.com/echo_canceller/desktop/e1_ec_desktop.html - I want to know where to buy and price. Any suggestion is appreciated. Thanks. Jason. p.s. : asterisk cli command "reload" can change rx_gain and

Hi Asterisk Users, we are using Asterisk 1.4.18.1 on debian 4.0 etch, pwlib 1.10 and openh323 1.18. We are using MeetMe for conference calls and with two participants there is no echo problems, but with more than two participants there is a lot of echo that sometimes disappear for a short time and all function well. Someone have some suggestions?? Do you ever used app_conference

Definitely! It tells me that my delay is fine but drifting is -15. I use the same onboard sound to record the near end and far end voice. So I can assume it should be fine? But I don't see the any different between input and output the echo_canceller function for this recording. Maybe there is some nonlinearity issue there? The link of this file(Capture1.zip) is in

...en > encoded in G.711. As such, I?m really interested in the echo > cancellation component of Speex, but not in the encode/decode. Finally, > only one channel of audio needs to be echo cancelled in the system. So, > here come the questions. :-) > > 1. Is it possible to call speex_echo_cancellation() on audio frames not > already encoded in Speex? Yes. The echo canceller is now part of libspeexdsp, which is totally independent from the codec part. > 2. Can anyone compare / contrast the features of Speex?s echo > cancellation versus those of, say, Ittiam > (http://www.ittiam.com/...

...ble solution. > > Right now I am working on two recorded audio track where the mic and the > speakers are both in sync or out of sync in different parts of the files. > > I am trying to perform the synchronization, using the cross-correlation, on > each frame before to pass on the echo_cancellation. > In particular the parameters of cancellation will be the frame taken from > the mic file, and the frame from the speaker files which better > cross-correlated with the mic frame. > The result is not very different from the output without synchronization. > > So my questions are...