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Asterisk apparently has five echo cancellation algorithms: STEVE, STEVE2, MARK, MARK2 and MARK3. The current default appears to be MARK2. My question is, has anyone had any experience with any of the others (other than MARK2), and is there some conventional wisdom as to when to use one over another? TIA Bruce Komito High Sierra Networks, Inc. www.servers-r-us.com (775) 236-5815

...sterisk-users@lists.digium.com > Subject: Re: [Asterisk-Users] Best echo canceller? > > > On Thursday 29 September 2005 17:04, Claudio Canseco wrote: > > In your experience what is the best choice for echo canceller ? > > Which one should work better: STEVE, STEVE2, MARK, MARK2, MARK3, KB1 ? > > KB1 is a refactored MARK2 which seems to work VERY, very well. > {clip} The refactoring applied to MARK2 to create KB1 was basically intended to make the code generally consistent with the Texas Instruments whitepaper referenced in the comments at the top of the file....

...solve it. I would highly appeciate your help. I have following dataset from family dataset : Here we have individuals and their two parents and their marker scores (marker1, marker2,....and so on). 0 means that their parent information not available. Individual Parent1 Parent2 mark1 mark2 1 0 0 12 11 2 0 0 11 22 3 0 0 13 22 4 0 0 13 11 5 1 2 11 12 6 1 2 12 12 7 3 4 11 12 8 3 4 13 12 9 1 4 11 12 10 1 4 11 12 I want to recode mark1 and other mark2.....and so on column by looking indvidual parent (Parent1 and Parent2). For exampl...

...rybody!! I'm trying to assign boolean values to a column in a matrix depending on the number of times present in another column. I have no clue, I have been 2 days looking for a way, if somebody knows what kind of functions I need to use I will really apreciate it. example: Color Type Mark1 Mark2 Mark3 Red high 139 P alpha blue low 140 P alpha Green high 141 S alpha Yellow low 142 S beta Red high 143 P gamma If we only take into account columns Mark1, Mark2 and Mark3. I would like to ask R to write another column with 0=one;...

I have a bad echo problem on my TDM400P with one FXO module installed. I have tried a few things, such as: * setting rxgain and txgain to 0 * setting echocancelwhenbridged to no / yes * settting echocancel to 64 / no / yes * setting echocanceltraining to 800 / no / yes * MG2 echo cancellation * MARK2 echo cancellation * KB1 echo cancellation * AGGRESSIVE_SUPPRESSOR option of MARK2 Each time restarting Asterisk, then opening the Zap channel, and then speaking...only to hear my self played back almost instantly. None of these options changed the echo for me, it always sounded the same -- excep...

...22 To: Asterisk Users Mailing List - Non-Commercial Discussion Subject: Re: [Asterisk-Users] echo cancellation: the never-ending quest fortruth "Bruce Komito" <brucek@bagel.com> spake thusly: > Asterisk apparently has five echo cancellation algorithms: STEVE, STEVE2, > MARK, MARK2 and MARK3. The current default appears to be MARK2. > > My question is, has anyone had any experience with any of the others > (other than MARK2), and is there some conventional wisdom as to when to > use one over another? Bruce, I asked Mark that question at Astricon, since it seems...

hi! In your experience what is the best choice for echo canceller ? Which one should work better: STEVE, STEVE2, MARK, MARK2, MARK3, KB1 ? Regards, Claudio -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.digium.com/pipermail/asterisk-users/attachments/20050929/f556bf91/attachment.htm

I notice the zaptel Makefile option the mark2 option & KFLAGS+=-DAGGRESSIVE_SUPPRESSOR is now gone. Does simply adding these options still compile in a certain echo can - or is there an other method of activating a particular can. I have not had to update my machine that is connected to pstn for a while & I don't want to jump into...

...n anybody tell me if echo cancellation is really needed even at a T1 PRI to the telco? Because people keep saying when they deploy voip solution in Hong Kong using T1 PRI, there is no need of echo cancellation. (even the local Digium distributor) Asterisk is 1.2.13, zaptel is 1.2.10. I choosed the MARK2 canceller in the zaptel. The setting in zaptel is default: echocancel=yes echocancelwhenbridged=yes echotraining=yes rxgain=0 txgain=0 When I tried to adjust the echocancel value to a higher taps (e.g. 256) or adjust the rxgain/txgain value, I can even hear echo much easier. Anyone can confirm w...

This may be commonly known but I haven't come across it so here goes, maybe it'll help someone: I have terrible echo with asterisk 1.2, zaptel 1.2.12, and a TDM400P with 1 FXS and two FXO modules. The Mark2 echo canceller with Aggressive turned on was the only setting that would make it acceptable. I found fxotune with this zaptel version to be broken. I pulled the latest fxotune.c and fxotune.h from cvs and recompiled zaptel. fxotune then ran but I got the error: Could not fill input buffer -...

I've got echo problems. *** I'm looking for paid support. *** I'll accept free support, but don't mind paying if someone really knows what they are doing. I've read the wiki, etc. Played with the settings in zapata.conf Using V400P PSTN->_T1->_ASTERISK->_BROADVOICE->_PSTN ECHO ON CALLED PHONE PSTN->_T1->_ASTERISK->_T1->_PSTN NO ECHO

Just updated from CVS 12-23-03 to tarbal 0.7.1. Identical settings in zconfig.h for echo cancellation (MARK2, aggressive OFF). The echo got worse, much worse. It takes longer to train and overspeak now disables cancellation, which it did not before. In fact, I now have echo on VoIP to VoIP on our local network, which I never had before. Was something changed with the echo supression which was not do...

Hello, We're in the process of setting up an Asterisk server, and are having echo problems. We have a Digium TE110P, and have tried the MG and MARK2 AGGRESSIVE echo cancellers, with a variety of gain levels and training times, and with both trunk and 1.2 branch versions of Zaptel, Libpre, and Asterisk. In all cases, callers from the PSTN hear their own voice echoed back after 1.5-2 seconds; none of these adjustments made a difference, except a...

Over the last couple weeks I've tried everything I could get my hands on in an attempt to get rid of my echo problems. Using a CVS checkout of just yesterday, I've tried every echo cancellation routine in zconfig.h (including Mark2 w/Aggressive) , as well as the echotraining=800 mentioned on this list just last week. While some things worked better then others, I would consider none acceptable solutions in my situation. Playing with rx/tx gain values just seemed to quiet the voice down and along with that the echo happened...

...ut have not been able to find a solution to the problem. The version of code I am running is from CVS as of 6/30/04. What happens is that when I make an IAX call to another IAX client the caller receives a really bad echo. All of the documentation I found around using -DAGRESSIVE_SUPPRESSION and MARK2 or one of those options seems to be around echo when going out an FXO port through a zaptel channel. It wasn't obvious to me if this same process could be done on the IAX channels and if so how? For reference my iax.conf looks likes: [general] port=5036 bindaddr=0.0.0.0 bandwidth=low echocan...

...Optiplex with 1 TDM400 4 FXO, 1 TDM400 4 FXS, (no other card, each of them have their own IRQ) all ports connected to the EADS. We have GS ATA286 as EP. Calling from ATA to ATA give a perfect sound. Calling to PSTN numbers or reverse side, give echo. We can do what we want in zconfig.h (STEVE2, MARK2, MMX, AGGRESSIV_SUPPRESSOR, NOECHOCAN_DISABLE) or zapata.conf (tx gain=-10.0, echocancel=32 ... 256,), test with differents POTS phone, it change nothing. We even didn't notice changes between our various changes in those files (and yes modules where unloaded between each test). Always the...

hi to all, I''m studying traffic shaping using kernel 2.6.8 (debian sarge). well, I have this problem: priority doesn''t work. I try with: - qdisc prio: tc qdisc add dev eth1 root handle 12: prio bands 3 tc qdisc add dev eth1 parent 12:1 handle 13: tbf rate 10Mbit buffer 1600 limit 3000

...with the following hardware: Asus Vintage (sis chipset) P4 2.8 512M Ram LSI SATA Raid card (2x80g drives) Digium TDM400 we had originally purchased a tdm2400 with echo cancellation but couldn't fit it in the chassis. Spent 3 - 4 hours tracking down the source of the echo to no avail, enabled mark2 echo cancel and aggressive echo cancel to get the system to where the customer was satisfied with the performance. Came back to the lab, pulled out a duplicate system, had the same problem. So I swapped out the Digium card with an OpenSwitch6, all of my problems went away! No echo, great call vo...

...to a port on T400P. The problem is that some calls that come in don't seem to bridge properly. Heres what happens. Call comes in on Trunk. Call Routed to correct Zap Channel. Phone Rings. Person Answers phone, but hears nothing but their own echo. Calling party hears everything fine. I have MARK2 enabled in Zaptel driver for echo problems on my PRI line. I can't seem to replicate the problem calling out PRI to the DIDs, or from a cell phone. I can reliably replicate the problem with an offsite customer that calls in. Any idea what may be causing this? Thanks in advance.

...tphones. A few months back,I had gone thru the recommendation on the list to remove echo from the SIP phones(I never did have any echo on the TDM400P FXS phones), and had removed about 90% of the echo. There was still some occassionally that I couldn't figure out how to get rid of. I used MARK2 without the AGRESSIVE cancel option with the following zaptel.conf settings before the latest path: echocancel=yes echocancelwhenbridged=yes echotraining=yes rxgain=8.0 after applying the patch my settings are the same except for: echotraining=800 Problem: I'm seeing is that echo is actu...