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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 ← 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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