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# Audio Stream-to-Text Conversion

HPE IDOL Speech Server can perform real-time speech-to-text conversion on an audio stream. The following sample configuration is for such a task.

    [StreamToText]
    0 = a ← stream(MONO, input)
    1 = f ← frontend(_, a)
    2 = nf ← normalizer(_, f)
    3 = w ← stt(_, nf)
    4 = output ← wout(_, w)
    DefaultResults=Out

`0` | The `stream` module processes stream audio data.
`1` | The `frontend` module converts audio data into speech front-end frame data.
`2` | The `normalizer` module normalizes frame data from `1` (`f`).
`3` | The `stt` module converts normalized frame data from `2` (`nf`) into text.
`4` | The `wout` module writes the recognized words resulting from `3` (`w`) to the output file.

You can also use the `[StreamToTextMusicFilter]` schema to combine audio stream-to-text conversion with speech classification in a single step so that you can then remove sections classified as music or noise from the resulting output file.

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