SpeechRecognitionRejectedEventArgs Class

Definition

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

public class SpeechRecognitionRejectedEventArgs : System.Speech.Recognition.RecognitionEventArgs

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

type SpeechRecognitionRejectedEventArgs = class
    inherit RecognitionEventArgs

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

Public Class SpeechRecognitionRejectedEventArgs
Inherits RecognitionEventArgs

Inheritance

Object

EventArgs

RecognitionEventArgs

SpeechRecognitionRejectedEventArgs

Attributes

SerializableAttribute

Examples

The following example recognizes phrases such as "Display the list of artists in the jazz category" or "Display albums gospel". The example uses a handler for the SpeechRecognitionRejected event to display a notification in the console when the speech input cannot be matched to the contents of the grammar with sufficient confidence to produce a successful recognition.

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 a grammar.  
        //  Create lists of alternative choices.  
        Choices listTypes = new Choices(new string[] { "albums", "artists" });  
        Choices genres = new Choices(new string[] {   
          "blues", "classical", "gospel", "jazz", "rock" });  

        //  Create a GrammarBuilder object and assemble the grammar components.  
        GrammarBuilder mediaMenu = new GrammarBuilder("Display");  
        mediaMenu.Append("the list of", 0, 1);  
        mediaMenu.Append(listTypes);  
        mediaMenu.Append("in the", 0, 1);  
        mediaMenu.Append(genres);  
        mediaMenu.Append("category", 0, 1);  

        //  Build a Grammar object from the GrammarBuilder.  
        Grammar mediaMenuGrammar = new Grammar(mediaMenu);  
        mediaMenuGrammar.Name = "Media Chooser";  

        // Attach event handlers.  
        recognizer.LoadGrammarCompleted +=  
          new EventHandler<LoadGrammarCompletedEventArgs>(recognizer_LoadGrammarCompleted);  
        recognizer.SpeechRecognized +=  
          new EventHandler<SpeechRecognizedEventArgs>(recognizer_SpeechRecognized);  
        recognizer.SpeechRecognitionRejected +=   
          new EventHandler<SpeechRecognitionRejectedEventArgs>(recognizer_SpeechRecognitionRejected);  

        // Load the grammar object to the recognizer.  
        recognizer.LoadGrammarAsync(mediaMenuGrammar);  

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

    // Handle the SpeechRecognitionRejected event.  
    static void recognizer_SpeechRecognitionRejected(object sender, SpeechRecognitionRejectedEventArgs e)  
    {  
      Console.WriteLine("Speech input was rejected.");  
      foreach (RecognizedPhrase phrase in e.Result.Alternates)  
      {  
        Console.WriteLine("  Rejected phrase: " + phrase.Text);  
        Console.WriteLine("  Confidence score: " + phrase.Confidence);  
      }  
    }  

    // 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);  
    }  
  }  
}  

Remarks

The SpeechRecognitionRejected event is raised by the SpeechRecognizer and SpeechRecognitionEngine classes.

SpeechRecognitionRejected events are generated by a speech recognition engine when none of the alternates from a recognition operation have a high enough confidence score to be accepted. Detailed information about rejected phrases is available through the Result property.

SpeechRecognitionRejectedEventArgs derives from RecognitionEventArgs.

Properties

Methods

Applies to

See also

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