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# [normalizer] Module Configuration

The `normalizer` module removes undesirable acoustic characteristics from the audio, such as speaker and audio channel effects. Audio normalization is a preprocessing requirement in most audio analysis operations, such as speech to text.

## Input and Output

Mode | Input | Output | Description
--- | --- | --- | ---
`BLOCK` | `f` | `nf` | In `BLOCK` mode, the normalization is calculated over the whole utterance. Recommended for short utterances.
`RUNNING` | `f` | `nf` | In `RUNNING` mode, the normalization process continuously adapts to the acoustic properties of the input audio.
`RUNNING` | `f`, `w` | `nf` | If the `normalizer` module in `RUNNING` mode is supplied with a word label stream in addition to feature frames, the normalization process continuously adapts to areas of audio categorized as speech.

Example:

    nf <- normalizer(_, f)

    nf <- normalizer(BLOCK, f)

    nf <- normalizer(_, f, w)

## Parameters

DnnFile
DnnFileStd
IANFile*
ZeroNoiseFrames
ZeroSilFrames

*You must set the value of this configuration parameter by setting the corresponding action parameter.

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