RecognizeCompletedEventArgs.AudioPosition Property


Gets the location in the input device's audio stream associated with the RecognizeCompleted event.

 property TimeSpan AudioPosition { TimeSpan get(); };
public TimeSpan AudioPosition { get; }
member this.AudioPosition : TimeSpan
Public ReadOnly Property AudioPosition As TimeSpan

Property Value


The location in the input device's audio stream associated with the RecognizeCompleted event.


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");  


This property references the position at the beginning of the recognized phrase in the input device's generated audio stream. By contrast, the RecognizerAudioPosition property references the recognizer's position within its audio input. These positions can be different. For more information, see Using Speech Recognition Events.

Applies to

See also