Identify DTMF Dial Tones

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

[DtmfAudioNet]
0 = a, ts ← audio(MONO, input)
1 = f <- frontend(_, a)
2 = nf <- normalizer(_, f)
3 = d ← audiopreproc(T, a, nf)
4 = output ← wout (_, w:d, ts)
0 The audio module processes the mono audio.
1 The frontend module converts the audio data from 0 into front-end frame data.
2 The normalizer module normalizes the frame data from 1.
3 The audiopreproc module in DTMF identification mode (T) processes the audio (a) and normalized frame data (nf).
4 The wout module writes the DTMF label information (d) to the output file.

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