Yes, I think I may. I'd be curious to see if more taps, plus the
"pre-train" patch may work for me... I'll let the group know what
happens. I'm not too worried about processor usage. We only have
three lines, and it's a 2ghz processor with 2gigs of ram... :)
Thanks,
Brian
On Jun 9, 2006, at 12:38 PM, Colin Anderson wrote:
More taps in the Zaptel echo can = higher CPU usage + longer
training times.
In my experience, specifying an overly high number of taps (even
256) will
bog the system when it is under load and lead to subjective delays
in the
audio path. But if you are going to be only doing 1 or 2 concurrent
calls,
why not experiment?
-----Original Message-----
From: Brian Swan [mailto:[EMAIL PROTECTED]
Sent: Friday, June 09, 2006 11:29 AM
To: Asterisk Users Mailing List - Non-Commercial Discussion
Subject: Re: [Asterisk-Users] Fun with Echo
My wife is the customer, so she tends to give me funny looks when I
ask her to sign waivers. ;) In all seriousness, though, I do recall
reading that the 256 tap limit is "enforced" in software and that you
can add/remove/whatever a few lines of code, and go up to 1024 (or
greater I'd assume). Has anyone tried this? I'm considering
attempting it this weekend to see if it does anything. Does more
taps always = better echo cancelation?
Thanks!
Brian
On Jun 9, 2006, at 12:15 PM, Mike Fedyk wrote:
Steve Davies wrote:
On 6/9/06, Dr. Michael J. Chudobiak <[EMAIL PROTECTED]> wrote:
Consider getting a Sangoma A200D
(http://www.sangoma.com/datasheets/p_a200-specs) with the optional
hardware echo canceller module. It "just works" for echo
cancellation;
no tweaks required. It takes a while to figure out how to install
it,
but once it's working it's great!
Yes, I must agree that hardware echo cancellation from Sangoma
(and I
am sure Digium and others) is excellent, but it does add to the cost
quite significantly sometimes.
If you haven't had your client sign a waiver that there maybe echo
because of the cheap hardware, then don't use the tdm400p. I've
wondered why the software echo can in zaptel doesn't go up to 1024
taps and causes major problems at 256 taps. The tdm400p cards
don't have a high port density, you'd run out of slots before
hitting CPU barriers so why not use some of those resources for an
echo can with a longer tail?
Use either the sangoma cards with echo can, or get a tdm2400p with
echo can. You will have happier customers if you do.
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