SpeechRecognizedEventArgs Class

Definition

public ref class SpeechRecognizedEventArgs : System::Speech::Recognition::RecognitionEventArgs

[System.Serializable]
public class SpeechRecognizedEventArgs : System.Speech.Recognition.RecognitionEventArgs

[<System.Serializable>]
type SpeechRecognizedEventArgs = class
    inherit RecognitionEventArgs

Public Class SpeechRecognizedEventArgs
Inherits RecognitionEventArgs

Inheritance

Object

EventArgs

RecognitionEventArgs

SpeechRecognizedEventArgs

Attributes

SerializableAttribute

Examples

The following example is part of a console application that loads a speech recognition grammar and demonstrates speech input to the shared recognizer, the associated recognition results, and the associated events raised by the speech recognizer. If Windows Speech Recognition is not running, then starting this application will also start Windows Speech Recognition.

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 a shared speech recognition engine.  
    {  
      using (SpeechRecognizer recognizer = new SpeechRecognizer())  
      {  

        // 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("to");  
        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.  
        recognizer.LoadGrammarAsync(bookFlight);  

        // Keep the console window open.  
        Console.ReadLine();  
      }  
    }  

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

    // Handle the SpeechRecognized event.  
    static void recognizer_SpeechRecognized(object sender, SpeechRecognizedEventArgs e)  
    {  
      Console.WriteLine("Speech recognized:  " + e.Result.Text);  
      Console.WriteLine();  
      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);  
    }  
  }  
}  

Remarks

A SpeechRecognized event is raised by the Grammar, SpeechRecognizer and SpeechRecognitionEngine classes.

SpeechRecognized events are generated when one or more of the alternates from a recognition operation have a high enough confidence score to be accepted. To obtain detailed information about a recognized phrase, access the Result property in the handler for the event.

SpeechRecognizedEventArgs derives from the RecognitionEventArgs class.

Properties

Methods

Applies to

See also

• SpeechRecognizedEventArgs
• RecognitionEventArgs
• RecognitionResult
• SpeechHypothesized
• SpeechHypothesized
• SpeechRecognized
• SpeechHypothesizedEventArgs
• SpeechRecognitionRejected
• SpeechRecognitionRejected
• SpeechRecognitionRejectedEventArgs