Re: [linux-audio-dev] Amateur Radio Repeater - Audio control via soundcard

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Subject: Re: [linux-audio-dev] Amateur Radio Repeater - Audio control via soundcard
From: Tim Goetze (tim_AT_quitte.de)
Date: Sat Apr 07 2001 - 00:57:48 EEST

hi chris,

>effort, just detecting whether a particular tone pair (DTMF) or subaudible
>tone is part of the audio input.

i'd think of two ways to do that: either do a fourier transform (fftw
software package for example) and check for those frequencies' amplitudes
that you're looking for, or apply a bandpass filter for every frequency
and check the filtered signal amplitudes.

better suggestions anyone?

tim

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