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

[Nik Martin]

> 
> Nik Martin 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
> > 
> 15Khz of bandwidth?  Um, just currious.  Which telco would 
> this be that 
> is passing 15Khz of bandwidth?  The last I checked a typical analog 
> circuit passed 300Hz - 3Khz (at least, that's what they're 
> supposed to 
> do).  That's 2.7Khz of bandwidth.  Where is the extra 12.3Khz of 
> bandwidth that you mention coming from?
> 
> John
> 

I'm also in the Broadcast industry!  I was thinking of FM radiop at the
moment, sorry!