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

[Tim Goetze]

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