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# Identify Speakers in Audio

After you have trained a set of speaker templates, you can analyze audio to identify any sections where the trained speakers are present, by using the `IvSpkId` task.

You can specify the audio templates to use either by specifying a list as the value of the `TemplateList` parameter, or by specifying a template set as the value of the `TemplateSet` parameter. If you do not set any templates, IDOL Speech Server performs speaker segmentation and gender identification, but with no speaker labels.

To identify speakers in an audio file

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

  `Type` | The task name. Set to `IvSpkId`.
  `File` | The audio file to process.
  `TemplateSet` | The speaker template set file to use.
  `TemplateList` | A list file that specifies a set of templates to use (if a set file is not specified in the `TemplateSet` parameter).
  `ClosedSet` | Whether this is a closed-set test (by default, this parameter is set to `False`, resulting in an open-set test).
  `Out` | The file to write the speaker identification results to.

  To process an audio stream instead of a file, you can set the `InputType` parameter to `Stream`, in which case you do not need to set the `File` parameter.

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

For example:

`http://localhost:15000/action=AddTask&Type=IvSpkId&File=C:\Data\Speech.wav&TemplateSet=speakers.ivs&ClosedSet=False&Out=results.sid`

This action uses port `15000` to instruct IDOL Speech Server, which is located on the local machine, to search the `Speech.wav` file for speakers based on the template set file `speakers.ivs`, and to write the identification results to the `results.sid` file. Because the test is set to be open-set, IDOL Speech Server marks sections where no speaker scores above their respective thresholds as `Unknown_`.

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

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

## Format of Speaker Identification Results

IDOL Speech Server supports two speaker identification output formats: CTM and XML.

The following example shows CTM output produced by the `IvSpkId` task.

`1` | `A` | `0.000` | `0.520` | `Unknown_` | `NonSpeech_` | `0.000`
`1` | `A` | `0.520` | `10.030` | `Brown` | `MALE` | `3.540`
`1` | `A` | `10.550` | `0.080` | `Unknown_` | `NonSpeech_` | `0.000`
`1` | `A` | `10.630` | `9.460` | `Unknown_` | `FEMALE` | `0.000`
`1` | `A` | `20.090` | `6.150` | `Smith` | `MALE` | `6.983`

From left to right, the columns in the CTM file contain:

- The channel ID (usually `1`)
- A fixed field, `A`
- The start time of the processed segment in seconds
- The duration of the processed segment in seconds
- The recognized speaker, or `Unknown_`.
- The gender of the speaker (or `NonSpeech_`, if a non-speech segment)
- The score for the recognized speaker (`0.000` if non-speech or an unknown speaker)

NOTE:

The score for an identified speaker represents how well the processed speech matches the template. Scores can be negative or positive depending on the type of score normalization used, but in all cases a higher value represents a score that is closer to the model.

The following example shows XML output with the mode set to default:

    <sid_transcript>
    	<sid_record>
    		<start>0.000</start>
    		<end>0.520</end>
    		<label>Unknown_</label>
    		<gender>NonSpeech_</gender>
    		<score>0.000</score>
    	</sid_record>
    	<sid_record>
    		<start>0.520</start>
    		<end>10.550</end>
    		<label>Brown</label>
    		<gender>MALE</gender>
    		<score>3.540</score>
    	</sid_record>
    </sid_transcript>

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