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# Prepare the Audio Data

For each of the audio files in the adaptation data set, you must produce an audio feature (.plh) file.

To create an audio feature file from an audio file

- Send an `AddTask` action to HPE IDOL Speech Server, and set the following parameters:

  `Type` | The task name. Set to `WavToPlh`.
  `File` | The audio file to process.
  `NormFile` | The acoustic normalization file (.ian file in the language pack) to use.
  `Out` | The name of the audio feature file to create.

  If the audio file has a frequency of 8 kHz (8,000 Hz), you must also set the following parameter:

  `Sfreq` | The sample frequency of the audio file to process–either `8000` or `16000`. If you do not set a value for the `Sfreq` parameter, HPE IDOL Speech Server uses the default of `16000`.

For example:

    http://localhost:13000/action=AddTask&Type=WavToPlh&File=C:\myData\Speech.wav&NormFile=C:\SPKID\SPKID16k.ian&Out=Speech1.plh

This action uses port `13000` to instruct HPE IDOL Speech Server, which is located on the local machine, to produce the `Speech1.plh` feature file from the `Speech.wav` audio file, using the `SPKID16.ian` normalization file.

This action returns a token. You can use the token to:

- Check the task status. See Check the Status of a Task.
- Retrieve the feature file. See Find Recommended Language Resources to Use in a Task.

The generated audio feature files are used by the adaptation processes described in Present Adaptation Data to HPE IDOL Speech Server.

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