search for: echo_cancel

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 thi...

...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)...

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...

...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...

...Marc William Zhang a ?crit : > 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 > http://lists.xiph.org/pipermail/speex-dev/2007-March/005390.html > There is another record set in the file(Capture2.zip) which I got 141 > sample delay and d...

...ryone, >> >> I think this should be interesting to all of those with echo >> cancellation problems. I finally check in some code to make these >> problems easier to debug. You'll need to have svn version for this. >> >> First, you need to manually define DUMP_ECHO_CANCEL_DATA in the >> compilation (sorry configure switch for now). With that, the AEC will >> automatically save the near-end, far-end and output signals to files >> (aec_rec.sw aec_play.sw and aec_out.sw). These are exactly what the AEC >> receives and outputs. >> >>...

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 tx_gain? __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail ha...

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 http://lists.xiph.org/pipermail/speex-dev/2007-March/005390.html There is another record set in the file(Capture2.zip) which I got 141 sample delay and drift of 14. I did not rec...

...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.ittia...

...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 questio...