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

[shadowym]

The algorithms may be similar but EC is an infinitely variable
non-linear(analog) process.  A CPU cannot do that.  You can fake it by
performing cpu intensive rapid calculations one after another but it is
fundamentally not an analog processor.  HWEC is designed to deal with the
analog process on an instant by instant basis performing parallel
computations.  A CPU cannot do that at ANY clock speed.

-----Original Message-----
From: Matthew Fredrickson [mailto:creslin at digium.com] 
Sent: Wednesday, February 14, 2007 10:03 AM
To: Asterisk Users Mailing List - Non-Commercial Discussion
Subject: Re: [asterisk-users] The High Performance Echo Canceller (HPEC)


On Feb 14, 2007, at 10:17 AM, shadowym wrote:

> I gotta take issue with your comments that a HWEC is just software 
> running on a DSP.  In the case of Octasic, it's an ASIC.  How it does 
> EC is VERY different because.....it's done completely in hardware, not 
> firmware loaded into memory and run on a specialized CPU!  Yes, the 
> ASIC does contain an DSP but it is customized for EC.  You cannot 
> think of it as a CPU.

Yes, but the math and functions involved are the same.  It's just doing it
on one or the other involves different types of "instructions".

Matthew Fredrickson