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# StreamMode

The `StreamMode` parameter sets the algorithm mode for the speech-to-text process for audio streams. You can set it to:

- `fixed`–to use a fixed beam width for the speech-to-text process.
- `relative`–to use a model that performs calculations relative to a clock for the speech-to-text process.
- `live`–to use recognition that keeps pace with the rate at which data goes to the server. The rate can change during processing. To enable live mode for streamed speech-to-text conversions, you must set the `Mode` parameter in the `stt` and the `stream` module configuration sections.

TIP:

In live or relative mode, it is crucial to ensure that sufficient time is allowed for the recognition process to be robust and to produce transcriptions with good accuracy. To ensure this:

- There is a limit to the minimum time allowed to perform live or relative recognition, based on the size of the smallest DNN available.
- IDOL Speech Server monitors how deeply the search is progressing at each point, and sends the results to the speech-to-text diagnostic file at regular intervals. If this file indicates that a search has not had enough time, IDOL Speech Server issues a task warning. You can view this warning in the server log file, or retrieve it using the `GetStatus` action. IDOL Speech Server repeats the warning after each hour of audio processing.

NOTE:

If data streams too fast for the system's computational resources, recognition accuracy might be impaired. If you use live or relative mode with a DNN acoustic model, certain DNN file size and CPU processor limitations are in place to ensure that the target can be met.

Type: | String
Default: | `Fixed`
Range: | `Fixed`, `Relative`, or `Live`
Required: | No
Configuration Section: | audio module
Example: | `StreamMode=relative`
See Also: | Mode (action parameter) ModeValue

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