similar to: echo cancellation

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Hi, I tried keeping it for a very long time and put logs there and it always went to not adapting. This is how I initialize speex_echo_cancel SpeexEchoState* _echoState = speex_echo_state_init(160, 320*10); I have 20 msecs of audio with 16bits for a sample. If two frames are identical and are given to speex_echo_cancel for many iterations, should I expect silence. Thanks -Anurag Quoting

On 01/19/2011 06:44 PM, LiMaoquan2000 wrote: > > Hi all, > > We have discussed so many about sampling rate asynchronous (or offset) > between rendering (D/A converter) and capturing (A/D converter) of > most PC soundcards. It seems all acoustic echo cancellers, include AEC > in speex, can not deal with this trouble, because it causes a drift of > echo path and also

On 01/20/2011 04:26 AM, Steve Underwood wrote: > On 01/19/2011 06:44 PM, LiMaoquan2000 wrote: >> Hi all, >> >> We have discussed so many about sampling rate asynchronous (or offset) >> between rendering (D/A converter) and capturing (A/D converter) of >> most PC soundcards. It seems all acoustic echo cancellers, include AEC >> in speex, can not deal with this

Hi All, I have tried using echo cancellation, and I think it doesn't work well, because of how I resample. I take the raw 44100 Hz on my mac and just do a loop averaging every 5.5 samples to 1 sample to get 8018.18 Hz, and feed that to speex in 160 sample buffers. I realize that this introduces some aliasing, and I may try the new speex resampler, but I find it hard to believe that

Hi, I use speex1.1.10 [June 10, 2005]in my VoIP application and it works very good for me. But sometimes I get loud metalic noise. Turning off EC, disappears the noise right away. I use EC with denoiser ON, AGC OFF, echo tail 400 ms. Has anyone experienced this? Since Speex1.1.11 has improvement for EC, I tried with the latest release [Speex1.1.12, which has fixed point EC]. But in my test, EC

Hi Speex Developers, I'm Andrey Zhukov, the developer of PI-CONSULT GMBH company. Building a voip application that uses your libraries, i have found the strange problem with the latest version of Speex Libs. Our application works under win32, and i used before version speex 1.1.12 ( were built from sources). It seems i have resolved the known problem with clock drift of audio cards using

Hi all We use pci/pci-e BRI cards in our installations. Due to echo problems (that was before Oslec and others), we quickly switched to cards with hardware-based EC. So we use exclusively Digium B410p cards that provide 64ms tail EC. For several reasons we'd like to switch to external BRI gateways like the Patton smartnodes (the price is getting really close to a B410p). I'm

Dear all, I need to use echo cancellation in a VOIP application using speex narrowband codec.I am facing some problems with echo cancellation. It will be very helpfull if someone can put some light on the following issues. 1: =================== -- When call is started EC works fine for first few seconds. Bur after a certain period [usually 20 sec or more] it does not work or works very bad

We have recently purchased a B410P Digium 4* ISDN-2 card with hardware EC. On the same server, I also have a regular Digium 4-channel PSTN-card (TDM410P ?), used to interface to some analog devices, a.o. 2 fax machines. For faxing, EC needs to be off (or so I understand from the archives). How can I switch EC off for an ISDN B-channel if a fax is coming in? Z.

I did it Steve, but on some calls i still have the EC on OFF. What can i check? Could it depend of my zapata.conf ? Thanks Giordano Grandis -----Messaggio originale----- Da: asterisk-users-bounces@lists.digium.com [mailto:asterisk-users-bounces@lists.digium.com] Per conto di Steve Davies Inviato: marted? 28 marzo 2006 17.08 A: Asterisk Users Mailing List - Non-Commercial Discussion

Dear manager, Our company is developing embedded product, which requires echo cancellation. We found the speex license is open source under GPL, so we can use the library source code. I am struggling to port the echo cancellation part to MICROCHIP PIC32MZ family, which is based on M14K core from MIPS. The compiler is MICROCHIP XC32 C compiler. Do you have kind of support for this project for

Hi, all. I'm a programmer lived in Korea. This time, I was investingating echo cancellation and found speex echo cancellation related API. But echo stilll remains. 1. echo cancellation using only files works propertly. 2. echo cancellation using sound device works not propertly. You can download test files as followed. http://www.vdream.co.kr/temp/ec/echocancel.wmv ( testing screen capture

Hi! For reasons that I won't bore people with, I'd like to disable echo cancellation on-the-fly, depending on which DID a call came in on. I've seen things like spandsp disable EC for faxes, so I know it's possible. Any idea where to start looking? (I assume I'll have to make a helper application of some sort to be called externally, and that's fine.) Thanks! -Ken

Hello, I'm new to Echo Cancellation and I was wondering how it is handled/works on pure VoIP networks using Asterisk? I did some research on the internet about EC on VoIP networks, but I can't really put a grasp on it. We currently have some Echo Cancellation chips on our Digium cards, but are planning to move to a full VoIP network based on Asterisk. So no more ISDN in the voice path.

Get the latest code and look at mdf.c. This module is the echo canceller. Tom bast@sirrix.com wrote: > > Hello MailingList! > > I'm searching a Echo Cancellation to implement it in my own project. I > found > in a newsgroup a posting that you've programmed an open-source > EC-Algorithm. > > My Question: > Is it possible to get the source code of the

Probably the level of your signal is too low and/or you're just not letting it time to adapt. Jean-Marc Le mercredi 19 juillet 2006 ? 19:00 -0400, ac2491@columbia.edu a ?crit : > On closer looks and debugging I always end up in > > speex_echo_cancel function with comment > /* Temporary adaption rate if filter is not adapted correctly */ > > > Does this give any clue

We have been distributing asterisk servers for several years now, and early on decided that hardware echo can was the way to go. Our first few boxes without it had horrid echo problems, and attempts at tuning in 2006 didn't make any difference. We installed a new server yesterday at a client's location with a Rhino 4 port FXO card (HW EC included), and when an inbound call was

> 1) AGC: This seems to work pretty well in all cases. I had previously > hacked-in the "compander" filter from sox for a similar effect. What > I've noticed is that speex_preprocess's AGC has no "knobs", and it > seems to use an attack/decay that is a lot faster than what I had > chosen from the sox compander, but it works pretty well nonetheless.

Hi Jean-Marc, I am developing a voice chat for win32 using speex,when I do echo cancellation, after 2 seconds adaptation, the echo canceller work very well,but after process silent(zero) echo signal(when enabled VAD,DTX),it work very bad,I have to reset it, it seems adapt faster then do not rest it, so I always here echo produce by my fisrt two second speech,how can I solve this problem?