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# Categorize Audio

The following schema describes how to use the `audiopreproc` module to identify regions of silence, speech, and non-speech in an audio file.

    [AudioNet]
    0 = a, ts ← audio(MONO, input)
    1 = f1 <- frontend(_, a)
    2 = nf1 <- normalizer(_, f1)
    3 = w <- audiopreproc(A, a, nf1)
    2 = output ← wout (_, w, 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 audio classification mode (`A`) processes the audio (`a`) and normalized frame data (`nf`).
`4` | The `wout` module writes the audio classification information (`w`) to the output file.

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