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Set speech recognition timeouts

Set how long a speech recognizer ignores silence or unrecognizable sounds (babble) and continues listening for speech input.

Important

Speech recognition requires MSIX package identity. The Windows.Media.SpeechRecognition APIs are available only when your app runs with package identity (packaged or packaged with external location). Unpackaged apps cannot use these APIs.

Key APIs

Overview

The SpeechRecognizer.Timeouts property returns a SpeechRecognizerTimeouts object with three configurable TimeSpan values:

Property Description
InitialSilenceTimeout How long the SpeechRecognizer listens for silence before it concludes that no speech is forthcoming and finalizes an empty result.
EndSilenceTimeout How long the SpeechRecognizer listens for silence after recognized speech before it finalizes the result.
BabbleTimeout How long the SpeechRecognizer continues to listen for unrecognizable sounds (babble) before it assumes speech input has ended and finalizes the recognition operation.

Set timeout values

// Set the initial silence timeout to 6 seconds.
speechRecognizer.Timeouts.InitialSilenceTimeout = TimeSpan.FromSeconds(6.0);

// Set the end silence timeout to 1.2 seconds.
speechRecognizer.Timeouts.EndSilenceTimeout = TimeSpan.FromSeconds(1.2);

// Set the babble timeout to 0 (infinite — keep listening).
speechRecognizer.Timeouts.BabbleTimeout = TimeSpan.FromSeconds(0);

Note

Timeout values are set on the SpeechRecognizer before you start the recognition session. Changes after starting a session have no effect until the next session.

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