Identify DTMF Dial Tones

The following schema describes how to use the audiopreproc module to identify DTMF dial tones.

[DtmfAudioNet]
0 = a ← wav(MONO, input)
1 = d ← audiopreproc(T,a)
2 = output ← wout (_, w:d)
0 The wav module processes the mono audio.
1 The audiopreproc module in DTMF identification mode (T) processes the audio (a).
2 The wout module writes the DTMF label information (d) to the output file.

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