search for: reverberant

Hi, I'm trying to use Speex Echo Canceller for mobile device. The AEC works well so far. However, I want to know how to remove reverberation significantly. I noticed it's not implemented yet in Speex AEC. Are you going to implement it in next version? Could you provide some ideas how to handle reverberation on current version? Thanks in advance. Sincerely, Dennis

Hi, I've been trying to understand the documentation on the Speex echo canceller, and unless I'm confused, I think there's a mistake somewhere. The documentation on http://speex.org/docs/manual/speex-manual/node7.html#SECTION00740000000000000000 says, " The recommended tail length is approximately the third of the room reverberation time". However, the Octave script

Hi: Can anyone give some insight on: 1) As per the Speex manual, there is a mention of the relationship between input frame and echo frame (Pg 19, Para 2). I was wondering of what would be the ideal delay between these two frames, so that the echo is already fed to the canceller and the echo cancellation filter is not inefficient. 2) Corresponding to the above mentioned delay, what filter

Hi: I have been trying to test the speex AEC by playing a voice sample (pre-recorded) as a echo and capturing a new voice sample and playing the pre-recorded one, for reference. [Sampling rate 8 KHz, frame size 64] For some reason, I dont see any removal of echo. Does anybody have a idea of * Testing the AEC in some other mechanism or * Getting some sample files for testing AEC Thanks Su ---

...versation in one direction. Some improvement can be made by modifying the Qcurve function but it is very sensitive. A secondary problem we also have is that the residual echo during decay of far-end talk is not suppressed very well. This is probably caused by the strong echo coupling plus a fairly reverberant room. We have been able to solve this by adding a weighting factor and some accumulation on the residual_echo and echo_noise. This modification works perfect on the far-end-problem but worsen the main problem even more. Best Regards Johan

David Baker a ?crit : > Hi, > > I've been trying to understand the documentation on the Speex echo > canceller, and unless I'm confused, I think there's a mistake > somewhere. The documentation on http://speex.org/docs/manual/speex-manual/node7.html#SECTION00740000000000000000 > says, " The recommended tail length is approximately the third of > the

> Thank you all for valuable input, > > another question: when do I actually need the echo cancellation > (hardware / on board /on module ) ? > It depends on your environment. If there are still analog devices in addition to VoIP, I'd say always, but Asterisk has a rudimentary echo canceller already on board. The Telcos use echo cancellers themselves, but it cannot hurt to

...(HTTP/1.0 200 OK) <08/10/05@22:31:42> [source] relay from beijing.zhongshuo.org established. <08/10/05@22:31:42> [source] icy-name:Zhong Shuo: Stories From China On Change ; icy-genre:Talk World Asian Chinese <08/10/05@22:31:42> [source] icy-pub:1 ; icy-br:32 ; icy-url:http://www.reverberant.com/cw <08/10/05@22:31:42> [source] icy-irc:N/A ; icy-icq:N/A ; icy-aim:N/A <08/10/05@22:31:44> [dest: 205.188.234.97] starting stream (UID: 4)[L: 1]{A: SHOUTcast Directory Tester}(P: 1) <08/10/05@22:31:54> [yp_add] yp.shoutcast.com added me successfully <08/10/05@22:31:57>...

...to the upload bandwidth of a box running icecast, when more than one client connects? For example, if a box on a 128kbps upload connection is serving a 64Kbps stream (and not audio-on-demand) - is it limited to two connections or is icecast somehow more efficient? cheers, Iain -- Iain Mott www.reverberant.com

On Mar 28, 2004, at 8:23 PM, Jean-Marc Valin wrote: >> The st->zeta pointer isn't freed in the >> speex_preprocess_state_destroy() >> function of the preprocess.c file (alloced in line 167). It's in >> Speex 1.1.4 >> by the way. > > Oops... Thanks for letting me know. I'll change that for the next > release (in the mean time, the fix is

...n. Some improvement can be made by modifying the > Qcurve function but it is very sensitive. > > A secondary problem we also have is that the residual echo during > decay of far-end talk is not suppressed very well. This is probably > caused by the strong echo coupling plus a fairly reverberant room. We > have been able to solve this by adding a weighting factor and some > accumulation on the residual_echo and echo_noise. This modification > works perfect on the far-end-problem but worsen the main problem even > more. This is probably the effect of reverberation and can proba...

...han one computer (more importantly, more than one internet connection) is broadcasting the signal, which means you have to have some way of 'distributing' your listeners among the relays (you'll see lots of discussion about relays in the archive). Dan On 17/05/05, Iain Mott <mott@reverberant.com> wrote: > hello > > Another beginners question..... I've been googling through the icecast > archives looking for information on how icecast handles multiple > clients. Haven't been able to find what I'm looking for. > > Could someone please explain (or dir...

Unlivable. I fix it. I forgot the speex_preprocess(m_pPreprocess, buf, NULL) need to do enough samples too. Tks a lot! And speex_preprocess_ctl(preprocess, SPEEX_PREPROCESS_SET_DEREVERB, &tmp); f=.4; speex_preprocess_ctl(preprocess, SPEEX_PREPROCESS_SET_DEREVERB_DECAY, &f); f=.3; speex_preprocess_ctl(preprocess,

This is a heads up to let you know of my plans to work on a senior thesis project dealing with editing Vorbis losslessly in Audacity. You can find more information about my plans and what I'm up to here: http://www.reverberate.org/computers/thesis/ "vcut" from vorbis-tools will be an excellent starting point for me. I notice that it's marked "experimental"; why is

Hello The st->zeta pointer isn't freed in the speex_preprocess_state_destroy() function of the preprocess.c file (alloced in line 167). It's in Speex 1.1.4 by the way. I'm trying to make the denoiser work with my application and has got reasonable noise reduction after applying the denoiser. I, however, haven't been able to find any information of what the purpose of

...can be made by modifying the >> Qcurve function but it is very sensitive. >> >> A secondary problem we also have is that the residual echo during >> decay of far-end talk is not suppressed very well. This is probably >> caused by the strong echo coupling plus a fairly reverberant room. We >> have been able to solve this by adding a weighting factor and some >> accumulation on the residual_echo and echo_noise. This modification >> works perfect on the far-end-problem but worsen the main problem even >> more. > >This is probably the effect of rev...

Hello again. If you recall, I am the guy working on enabling Audacity to losslessly rearrange Ogg Vorbis files for my senior thesis. I have more or less completed the required modifications to Audacity to support this. You can read more about the work this entailed by reading my journal: http://www.reverberate.org/computers/thesis/journal Now my attention moves to the Ogg Vorbis code

>> Simply to say, in a quiet room, you can play a impulse signal and then find >> it's impulse response signal from the >> microphone. For example, if the delay between the impulse signal and its >> response signal range from 500 to >> 3000 cycles, you can buffer the far-end signal to 0-300 cycles and set the >> filter length to 4000. It is also called

> - set sampling rate to 8 kHz (at least for now) > - make sure the far end signal in the playback signal is always a bit in > advance (never late) compared to the mic signal. > - Set the tail length to something around 100 ms. > > Also, if you're using two different soundcards (as I understand) for the > playback and the capture, you're *never* going to get echo

> The st->zeta pointer isn't freed in the speex_preprocess_state_destroy() > function of the preprocess.c file (alloced in line 167). It's in Speex 1.1.4 > by the way. Oops... Thanks for letting me know. I'll change that for the next release (in the mean time, the fix is obvious). In case you're interested, I'm currently working on a reverberation suppression