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# Create Speaker ID Feature Files

Audio samples are used for training speaker templates, estimating speaker score thresholds, and for identification. There are tasks supporting these functions that work directly from an audio file (or stream). However, these tasks can only take a single audio source as input, due to the pipeline used for processing the audio.

For template training and for threshold estimation, you might want to use multiple audio files in a single task. To do this, create a speaker ID feature file for each audio file that you want to use, and then present the set of feature files to IDOL Speech Server.

To create a speaker ID feature file

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

  `Type` | The task name. Set to `IvSpkIdFeature`.
  `File` | The audio file that contains sample speech from one person.
  `Out` | The name of the speaker ID feature file to create.

For example:

`http://localhost:15000/action=AddTask&Type=IvSpkIdFeature&File=C:/Data/BrownSpeech1.wav&out=BrownSpeech1.ivp`

This action uses port `15000` to instruct IDOL Speech Server, which is located on the local machine, to create the `BrownSpeech1.ivp` feature file using the `BrownSpeech1.wav` 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 speaker template feature file.

You can set additional parameters. For details of the optional parameters, see the IDOL Speech Server Reference.

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