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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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