shadowym wrote:
Interesting,
Is this just a more advanced software echo canceller or software with
hardware hooks or software with hardware assisted processing?
A more advanced software canceller (there's no magical thing that makes
"hardware" echo cancellers better, it's still software, but it's running
on a DSP so it has more grunt available to it).
It's licensed from Adaptive Digital Technologies - G.168 compliant, and
supports up to 1024 taps (128ms) of tail coverage. Comes as a binary
blob, but such is life.
How would it compare to a true hardware echo canceller like the one Sangoma
uses. Besides the extra CPU cycles required.
Quite comparable - not sure if Octasic (as used by Sangoma and the
latest Digium cards) or ADT would win in a shootout, but they're both in
the same quality class.
The main issue is going to be CPU usage - getting this going at 1024
taps on a full T1/E1 span would likely require two fast CPUs with the
interrupts distributed evenly between them... and even then, *shrug*
Cheers,
Nic.
-----Original Message-----
From: Nic Bellamy [mailto:[EMAIL PROTECTED]
Sent: Tuesday, February 13, 2007 12:41 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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Nic Bellamy,
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