[Asterisk-Users] Re: IVR GSM voice prompt quality

[Chris Maresca]

On Tue, 27 Apr 2004, Andrew Kohlsmith wrote:

> > With an app like audacity (open source sound editor) it's very easy to
> > apply a high pass filter (start at 80-100 Hz or so) to make the files more
> > audible on the 15kHz bandwidth of analog phone circuits
> 
> I thought POTS had a 3600Hz passband (400-4000Hz)?

I actually experimented with 1khz high pass filter (the default) and it
seems much better.  I'm not really sure how the high-pass filter works in
Audacity, but this looks like the right direction.

Thx.

Chris.

--
chris maresca
      senior partner - www.olliancegroup.com

linux, up 22 days