asterisk users - Mar 2006 - most common VOIP echo simulaton for research purposes ?

Hi,

I'm speech recognition researcher and would like to do some research on 
recognition robustness in echo distortion of speech signal. Since VOIP is 
becoming wide spread, I'd like to simulate (one or more) common echo 
distortions that mostly appear in voip communications ? Any example, FIR or 
IIR filter or acoustical system response ?

Any other distortion worth researching ?

Thanks in advance,

regards,

Rob.

thats good to hear .but there are so many digium cards that does echo
distortion
then why do you want to do this

Giridhar Bandi

On 3/7/06, Robert Rozman <robert.rozman@comutel.si>
wrote:
>
> Hi,
>
> I'm speech recognition researcher and would like to do some research on
> recognition robustness in echo distortion of speech signal. Since VOIP is
> becoming wide spread, I'd like to simulate (one or more) common echo
> distortions that mostly appear in voip communications ? Any example, FIR
> or
> IIR filter or acoustical system response ?
>
> Any other distortion worth researching ?
>
> Thanks in advance,
>
> regards,
>
> Rob.
>
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