SpeechRecognitionEngine.SpeechRecognized Event


Raised when the SpeechRecognitionEngine receives input that matches any of its loaded and enabled Grammar objects.

 event EventHandler<System::Speech::Recognition::SpeechRecognizedEventArgs ^> ^ SpeechRecognized;
public event EventHandler<System.Speech.Recognition.SpeechRecognizedEventArgs> SpeechRecognized;
member this.SpeechRecognized : EventHandler<System.Speech.Recognition.SpeechRecognizedEventArgs> 
Public Custom Event SpeechRecognized As EventHandler(Of SpeechRecognizedEventArgs) 
Public Event SpeechRecognized As EventHandler(Of SpeechRecognizedEventArgs) 

Event Type


The following example is part of a console application that creates speech recognition grammar, constructs a Grammar object, and loads it into the SpeechRecognitionEngine to perform recognition. The example demonstrates speech input to a SpeechRecognitionEngine, the associated recognition results, and the associated events raised by the speech recognizer.

Spoken input such as "I want to fly from Chicago to Miami" will trigger a SpeechRecognized event. Speaking the phrase "Fly me from Houston to Chicago " will not trigger a SpeechRecognized event.

The example uses a handler for the SpeechRecognized event to display successfully recognized phrases and the semantics they contain in the console.

using System;  
using System.Speech.Recognition;  

namespace SampleRecognition  
  class Program  
    static void Main(string[] args)  

    // Initialize an in-process speech recognition engine.  
      using (SpeechRecognitionEngine recognizer = new SpeechRecognitionEngine())  

        // Create SemanticResultValue objects that contain cities and airport codes.  
        SemanticResultValue chicago = new SemanticResultValue("Chicago", "ORD");  
        SemanticResultValue boston = new SemanticResultValue("Boston", "BOS");  
        SemanticResultValue miami = new SemanticResultValue("Miami", "MIA");  
        SemanticResultValue dallas = new SemanticResultValue("Dallas", "DFW");  

        // Create a Choices object and add the SemanticResultValue objects, using  
        // implicit conversion from SemanticResultValue to GrammarBuilder  
        Choices cities = new Choices();  
        cities.Add(new Choices(new GrammarBuilder[] { chicago, boston, miami, dallas }));  

        // Build the phrase and add SemanticResultKeys.  
        GrammarBuilder chooseCities = new GrammarBuilder();  
        chooseCities.Append("I want to fly from");  
        chooseCities.Append(new SemanticResultKey("origin", cities));  
        chooseCities.Append(new SemanticResultKey("destination", cities));  

        // Build a Grammar object from the GrammarBuilder.  
        Grammar bookFlight = new Grammar(chooseCities);  
        bookFlight.Name = "Book Flight";  

        // Add a handler for the LoadGrammarCompleted event.  
        recognizer.LoadGrammarCompleted +=  
          new EventHandler<LoadGrammarCompletedEventArgs>(recognizer_LoadGrammarCompleted);  

        // Add a handler for the SpeechRecognized event.  
        recognizer.SpeechRecognized +=  
          new EventHandler<SpeechRecognizedEventArgs>(recognizer_SpeechRecognized);  

        // Load the grammar object to the recognizer.  

        // Set the input to the recognizer.  

        // Start recognition.  

        // Keep the console window open.  

    // Handle the LoadGrammarCompleted event.  
    static void recognizer_LoadGrammarCompleted(object sender, LoadGrammarCompletedEventArgs e)  
      Console.WriteLine("Grammar loaded: " + e.Grammar.Name);  

    // Handle the SpeechRecognized event.  
    static void recognizer_SpeechRecognized(object sender, SpeechRecognizedEventArgs e)  
      Console.WriteLine("Speech recognized:  " + e.Result.Text);  
      Console.WriteLine("Semantic results:");  
      Console.WriteLine("  The flight origin is " + e.Result.Semantics["origin"].Value);  
      Console.WriteLine("  The flight destination is " + e.Result.Semantics["destination"].Value);  


You can initiate a recognition operation using the one of the Recognize or RecognizeAsync methods. The recognizer raises the SpeechRecognized event if it determines that input matches one of its loaded Grammar objects with a sufficient level of confidence to constitute recognition. The Result property of the SpeechRecognitionRejectedEventArgs contains the accepted RecognitionResult object. Handlers of SpeechRecognized events can obtain the recognized phrase as well as a list of recognition Alternates with lower confidence scores.

If your application is using a SpeechRecognitionEngine instance, you can modify the confidence level at which speech input is accepted or rejected with one of the UpdateRecognizerSetting methods. You can modify how the speech recognition responds to non-speech input using the BabbleTimeout, InitialSilenceTimeout, EndSilenceTimeout, and EndSilenceTimeoutAmbiguous properties.

When the recognizer receives input that matches a grammar, the Grammar object can raise its SpeechRecognized event. The Grammar object's SpeechRecognized event is raised prior to the speech recognizer's SpeechRecognized event. Any tasks specific to a particular grammar should always be performed by a handler for the SpeechRecognized event.

When you create a SpeechRecognized delegate, you identify the method that will handle the event. To associate the event with your event handler, add an instance of the delegate to the event. The event handler is called whenever the event occurs, unless you remove the delegate. For more information about event-handler delegates, see Events and Delegates.

Applies to

See also