search for: echo_canceller

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

Hello all, I'm a hardware person who has recently found himself thrust into a software role. So, please forgive any ignorance in the following questions. I've tried to do my homework reading the relevant manual pages and investigating the Doxygen documentation. :-) We're investigating acoustic echo cancellation solutions for a speech application. Our hardware will be a TI C64x+

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 need to decorrelate the input mic first and

Hi, Just installed Asterisk+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

Hello, I am using the speex AEC in a real time application. I have experienced that when the mic and the speakers tracks are on sync or with a small delay the AEC works very well. I understood that when they are out of sync the AEC cannot works, so what the "user" should do is to focus in order to have the tracks on sync. Since I am working in an environment where it is not rare to

...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 drif...

> 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 tx_gain? __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has t...

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 record...

Mike Ball a ?crit : > We?re investigating acoustic echo cancellation solutions for a speech > application. Our hardware will be a TI C64x+ series processor (DM6467) > which has both a DSP and ARM9 core. Our audio will be sampled at 8kHz > and fed in through the I2S ports on the DM6467, echo cancelled, and then > encoded in G.711. As such, I?m really interested in the echo >

I used to run in the same problem. A difference higher than 3Hz in sampling rate between mic and speaker data can cause a totally failure of AEC. However, I have not seen a proper solution to this problem in real time. If you roughly know the difference of sampling rate between the speaker and the mic file, you may try to resample each frame of mic file according to it. Otherwise, or if the