AudioState Enumeration


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Contains a list of possible states for the audio input to a speech recognition engine.

Namespace:   System.Speech.Recognition
Assembly:  System.Speech (in System.Speech.dll)

type AudioState

Member nameDescription

Receiving silence or non-speech background noise.


Receiving speech input.


Not processing audio input.

You can obtain the audio input state of the speech recognition engine with the SpeechRecognitionEngine.AudioState and SpeechRecognizer.AudioState properties. The SpeechRecognitionEngine.AudioStateChanged and SpeechRecognizer.AudioStateChanged events are raised when the audio input state of a speech recognition engine changes.

The following example demonstrates an event handler that handles the changing audio state of a speech recognizer.

private SpeechRecognitionEngine sre;

// Initializes the speech recognition engine.
private void Initialize()
  sre = new SpeechRecognitionEngine();

  // Add a handler for the AudioStateChanged event.
  sre.AudioStateChanged += new EventHandler<AudioStateChangedEventArgs>(sre_AudioStateChanged);

  // Add other initialization code here.

  // Handle the AudioStateChanged event.
  void sre_AudioStateChanged(object sender, AudioStateChangedEventArgs e)
  AudioState newState = e.AudioState;

  // Handle event here.

.NET Framework
Available since 3.0
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