Re: [Asterisk] DTMF noise

[Matti Aarnio]

On Wed, Jan 08, 2003 at 06:43:10AM -0600, David D. Hagood wrote:
> Thomas Tonino wrote:
> >Roy Sigurd Karlsbakk wrote:
> >>so - we DO NOT need a 'simplistic' DTMF decoder.
> >
> >You need a good one. But good can be simplistic, is what I'm saying.
> >
> >DTMF was designed to be easy to decode reliably. Complex doesn't 
> >automatically mean better.
> 
> I haven't looked at the code, but I'd recommend using a bank of Goertzel 
> filters -

  Do look into   drivers/isdn/isdn_audio.c     That does use  Görtzel 
  filter, but does not do complete energy comparisons -> false detections.

/Matti Aarnio