RecognizeCompletedEventArgs.InitialSilenceTimeout RecognizeCompletedEventArgs.InitialSilenceTimeout RecognizeCompletedEventArgs.InitialSilenceTimeout RecognizeCompletedEventArgs.InitialSilenceTimeout Property


Gets a value that indicates whether an initial silence timeout generated the RecognizeCompleted event.

 property bool InitialSilenceTimeout { bool get(); };
public bool InitialSilenceTimeout { get; }
member this.InitialSilenceTimeout : bool
Public ReadOnly Property InitialSilenceTimeout As Boolean

Property Value

true if the SpeechRecognitionEngine has detected only silence for a longer time period than was specified by its InitialSilenceTimeout property; otherwise false.


The following example performs asynchronous speech recognition on a speech recognition grammar, using the SpeechRecognitionEngine.RecognizeAsync method with the in-process recognizer. The example uses Choices and GrammarBuilder objects to create the speech recognition grammar before building it into a Grammar object. A handler for the SpeechRecognitionEngine.RecognizeCompleted event outputs information about the recognition operation to the console.

using System;  
using System.Speech.Recognition;  
namespace SampleRecognition  
  class Program  
    private static SpeechRecognitionEngine recognizer;  
    public static void Main(string[] args)  
      // Initialize a SpeechRecognitionEngine object and set its input.  
      recognizer = new SpeechRecognitionEngine(new System.Globalization.CultureInfo("en-US"));  
      // Configure recognition parameters.  
      recognizer.InitialSilenceTimeout = TimeSpan.FromSeconds(5.0);  
      recognizer.BabbleTimeout = TimeSpan.FromSeconds(3.0);  
      recognizer.EndSilenceTimeout = TimeSpan.FromSeconds(1.0);  
      recognizer.EndSilenceTimeoutAmbiguous = TimeSpan.FromSeconds(1.0);  
      // Add a handler for the LoadGrammarCompleted event.  
      recognizer.LoadGrammarCompleted +=  
        new EventHandler<LoadGrammarCompletedEventArgs>(recognizer_LoadGrammarCompleted);  
      // Add a handler for the RecognizeCompleted event.  
      recognizer.RecognizeCompleted +=   
        new EventHandler<RecognizeCompletedEventArgs>(recognizer_RecognizeCompleted);  
      // Create a speech recognition grammar and build it into a Grammar object.  
      Choices bankingMenu = new Choices(new string[]   
      { "Access accounts", "Transfer funds", "Pay bills", "Get loan balance" });  
      GrammarBuilder banking = new GrammarBuilder(bankingMenu);  
      Grammar bankGrammar = new Grammar(banking);  
      bankGrammar.Name = "Banking Menu";  
      // Load the Grammar objects to the recognizer.  
      // Start asynchronous, continuous recognition.  
      // Keep the console window open.  
    // Handle the RecognizeCompleted event.  
    static void recognizer_RecognizeCompleted(object sender, RecognizeCompletedEventArgs e)  
      if (e.Error != null)  
          "RecognizeCompleted, error occurred during recognition: {0}", e.Error);  
      if (e.InitialSilenceTimeout || e.BabbleTimeout)  
          "RecognizeCompleted: BabbleTimeout({0}), InitialSilenceTimeout({1}).",  
          e.BabbleTimeout, e.InitialSilenceTimeout);  
      if (e.InputStreamEnded)  
          "RecognizeCompleted: AudioPosition({0}), InputStreamEnded({1}).",  
          e.AudioPosition, e.InputStreamEnded);  
      if (e.Result != null)  
          "RecognizeCompleted: Grammar ({0}), Text ({1}), Confidence ({2}), AudioPosition ({3}).",  
          e.Result.Grammar.Name, e.Result.Text, e.Result.Confidence, e.AudioPosition);  
        Console.WriteLine("RecognizeCompleted: No result.");  
      Console.WriteLine("Press any key to exit...");  
    // Handle the LoadGrammarCompleted event.   
    static void recognizer_LoadGrammarCompleted(object sender, LoadGrammarCompletedEventArgs e)  
      string grammarName = e.Grammar.Name;  
      bool grammarLoaded = e.Grammar.Loaded;  
      bool grammarEnabled = e.Grammar.Enabled;  
      if (e.Error != null)  
        Console.WriteLine("LoadGrammar for {0} failed with a {1}.",  
        grammarName, e.Error.GetType().Name);  
        // Add exception handling code here.  
      Console.WriteLine("Grammar {0} {1} loaded and {2} enabled.", grammarName,   
        (grammarLoaded) ? "is" : "is not", (grammarEnabled) ? "is" : "is not");  

Applies to

See also