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# 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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