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# Speech-to-Text with Word Filtering

The following schema describes a speech-to-text operation that is followed by a postprocessing operation that filters the results to replace any inappropriate words with a specified term (by default, this term is `“<BLEEP>”`).

    [WavToTextFilter]
    0 = a ← wav(MONO, input)
    1 = f ← frontend(_, a)
    2 = nf ← normalizer(_, f)
    3 = w1 ← stt (_, nf)
    4 = w2 ← postproc(B, w1)
    5 = output ← wout (_,w2)
    DefaultResults = out

`0` | The `wav` module processes the mono audio.
`1` | The `frontend` module converts the audio data into speech front-end frame data.
`2` | The `normalizer` module normalizes the frame data.
`3` | The `stt` module converts the normalized frame data into text.
`4` | The `postproc` module replaces barred words in the text with a specified term.
`5` | The `wout` module writes the filtered words resulting from `4` to file.

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