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

[Dean Collins]

How do you fake echo for testing purposes then?

 

Regards,

Dean Collins
Cognation Pty Ltd
dean at cognation.net
+1-212-203-4357 Ph
+1-917-207-3420 Mb
+61-2-9016-5642 (Sydney in-dial).


> -----Original Message-----
> From: asterisk-users-bounces at lists.digium.com [mailto:asterisk-users-
> bounces at lists.digium.com] On Behalf Of Nic Bellamy
> Sent: Thursday, 15 February 2007 3:53 PM
> To: Asterisk Users Mailing List - Non-Commercial Discussion
> Subject: Re: [asterisk-users] The High Performance Echo Canceller
(HPEC)
> 
> Wireless wrote:
> > 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)
> >
> It should work, providing all the Wanpipe stuff is ready to work with
> Zaptel 1.2.13.
> 
> As far as performance, you should be able to get one, maybe two
channels
> of 1024 tap cancellation on the P3, but I'd advise careful testing,
> perhaps even using oprofile for a while to keep an eye on what's using
what.
> 
> You also have to watch out extra carefully due to the following: HPEC
> works in "sparse" mode, meaning it can cover 1024 taps, but just
cancels
> echo in the parts where there is echo - hence CPU usage will likely
> change quite a bit with different echo paths - ie. a simple single
> reflection path will use less CPU than a complicated path with more
than
> one reflection.
> 
> Cheers,
>     Nic.
> 
> --
> Nic Bellamy,
> Head Of Engineering, Vadacom Ltd - http://www.vadacom.co.nz/
> 
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