Re: i4l dtmf errors

From: Kai Germaschewski (
Date: Sat Dec 14 2002 - 18:14:43 EST

On Sat, 14 Dec 2002, Wolfgang Fritz wrote:

> > it seems isdn4linux detects DTMF tones from normal speach. This is
> > rather annoying when using i4l for voice with This is
> > tested on all recent kernels
> The DTMF detection is broken since kernel 2.0.x. I have a patch for a
> 2.2 kernel which may manually be applied 2.4 kernels with some manual
> work. It fixes an overflow problem in the goertzel algorithm (which
> does the basic tone detection) and changes the algorithm to detect the
> DTMF pairs. If interested, I can try to recover that patch.

If you dig out that patch and submit it (to me), I'm pretty sure there's
a good chance of it going into the official kernel. ISTR there was talk
about that earlier, but nothing ever happened.


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