[asterisk-users] The High Performance Echo Canceller (HPEC)

[Bill Gibbs]

Will this work with SIP channels?  I get zero echo out the PRI but I do
get it occasionally on a LD provider (SIP) we use.  The stock * install
doesn't appear to be doing anything stopping echo on those channels.

Bill

-----Original Message-----
From: asterisk-users-bounces at lists.digium.com
[mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Nic
Bellamy
Sent: Tuesday, February 13, 2007 3:41 PM
To: Asterisk Users Mailing List - Non-Commercial Discussion
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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