[Asterisk-Users] Is this echo problem down to IP Phone hardware?

[Kris Boutilier]

> -----Original Message-----
> From: asterisk-users-bounces at lists.digium.com
> [mailto:asterisk-users-bounces at lists.digium.com]On Behalf Of Steve Underwood
> Sent: Friday, August 05, 2005 11:40 AM
> To: Asterisk Users Mailing List - Non-Commercial Discussion
> Subject: Re: [Asterisk-Users] Is this echo problem down to IP Phone hardware?
> 
> 
> Kris Boutilier wrote:
> 
> >This known as is 'acoustic echo' or 'room reverb' and 
> involves mathematics that is quite a bit different from that 
> used when cancelling regular 'reflected electrical signal' 
> echos, as the signal is being acousically distorted as it 
> echos around the room.   
> >
> The maths is exactly the same. 
{clip}

I had understood that the distortion of the spectral makeup of the acoustically reflected signal messed with the simpler forms of echo cancellers, hence the availability of 'AEC' daughterboards and so on for hardware echo cancellers, even those with tails already as long as 128ms. However, I'm frequently known to be wrong.

:-)