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SubjectRe: [Asterisk] DTMF noise
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
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