On Feb 15, 2007, at 3:17 AM, Wireless wrote:
----- Original Message -----
From: "Nic Bellamy" <[EMAIL PROTECTED]>
To: "Asterisk Users Mailing List - Non-Commercial Discussion"
<asterisk-users@lists.digium.com>
Sent: Tuesday, February 13, 2007 8:40 PM
Subject: Re: [asterisk-users] The High Performance Echo Canceller
(HPEC)
Larry Shields wrote:
I recently read about the following new technologies from Digium.
Has
anyone tried the new HPEC or knows when it will be available?
It's out now, and I've tried it - the difference between HPEC and MG2
from trunk is stunning - in situations with bad echo where MG2 can
take
ten or more seconds to converge to a reasonable degree, HPEC does it
in
perhaps 300ms - converging on my intake of breath before I say
"hello",
and absolutely no echo after that unless I purposefully go out of my
way
to screw it up (whistling/blowing into the handpiece for instance -
even
then, the malfunction is minimal).
You can now buy it from the Digium website (US$10 per channel), or if
you have an in-warranty Digium card, email through the serial numbers
to
Digium support and they'll give you a key (this is what I did).
You'll need Zaptel 1.2.13 to make it go.
It does take quite a bit of CPU though - perhaps 70% more compared to
MG2-trunk for the same number of taps from my rough measurements.
Cheers,
Nic.
--
Nic Bellamy,
Head Of Engineering, Vadacom Ltd - http://www.vadacom.co.nz/
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Does anyone know if the HPEC will work on a Sangoma A200 / 2 port FXO
card?
(I'm assuming so as it still uses Zapel) I've 2 PSTN lines one of
which I
cannot get rid of the echo, I've tried a 2GHz machine as apposed to my
normal P3 650MHz and this made no difference. Would the 650Mhz be
enough to
run HPEC on one line (I assume only needing one licence)
This is what Digium say on their web site:
Digium recommends that users requiring 8 channels at 1024 taps run a PC
comparible to a 3.0 GHz Pentium 4, while users only requiring 4
channels at
1024 taps may run a 2.5 GHz Pentium Celeron. The CPU requirements are
such
that it is impractical to operate this echo canceller at 1024 taps for
a
full T1 or E1 of channels.
Yes, it will work with any card that uses zaptel. You just have to
pay a per port fee to use it with a non-digium card. I'm not sure
about the performance requirements for one port though. You could try
it with a low tap count and keep bumping up your taps
(echocancel=[32,64,128,256,512,1024]) until it cancels the echo though.
That way you'd only use as much cpu as you absolutely have to.
Matthew Fredrickson
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