SpeechRecognizer.SpeechDetected Event

Definition

Namespace:

System.Speech.Recognition

Assembly:

System.Speech.dll

Package:

System.Speech v8.0.0

Source:

SpeechRecognizer.cs

Occurs when the recognizer detects input that it can identify as speech.

public:
 event EventHandler<System::Speech::Recognition::SpeechDetectedEventArgs ^> ^ SpeechDetected;

public event EventHandler<System.Speech.Recognition.SpeechDetectedEventArgs> SpeechDetected;

member this.SpeechDetected : EventHandler<System.Speech.Recognition.SpeechDetectedEventArgs> 

Public Event SpeechDetected As EventHandler(Of SpeechDetectedEventArgs) 

Event Type

EventHandler<SpeechDetectedEventArgs>

Examples

The following example is part of a console application for choosing origin and destination cities for a flight. The application recognizes phrases such as "I want to fly from Miami to Chicago." The example uses the SpeechDetected event to report the AudioPosition each time speech is detected.

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.  
        Choices cities = new Choices(new string[] {   
          "Los Angeles", "New York", "Chicago", "San Francisco", "Miami", "Dallas" });  

        GrammarBuilder gb = new GrammarBuilder();  
        gb.Append("I would like to fly from");  
        gb.Append(cities);  
        gb.Append("to");  
        gb.Append(cities);  

        // Create a Grammar object and load it to the recognizer.  
        Grammar g = new Grammar(gb);  
        g.Name = ("City Chooser");  
        recognizer.LoadGrammarAsync(g);  

        // Attach event handlers.  
        recognizer.LoadGrammarCompleted +=  
          new EventHandler<LoadGrammarCompletedEventArgs>(recognizer_LoadGrammarCompleted);  
        recognizer.SpeechDetected +=   
          new EventHandler<SpeechDetectedEventArgs>(recognizer_SpeechDetected);  
        recognizer.SpeechRecognized +=  
          new EventHandler<SpeechRecognizedEventArgs>(recognizer_SpeechRecognized);  

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

    // Handle the SpeechDetected event.  
    static void recognizer_SpeechDetected(object sender, SpeechDetectedEventArgs e)  
    {  
      Console.WriteLine("Speech detected at AudioPosition = {0}", e.AudioPosition);  
    }  

    // 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 shared recognizer can raise this event in response to input. The AudioPosition property of the associated SpeechDetectedEventArgs object indicates location in the input stream where the recognizer detected speech. For more information see the AudioPosition and RecognizerAudioPosition properties and the EmulateRecognize and EmulateRecognizeAsync methods.

When you create a delegate for a SpeechDetected event, 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.

See also

• SpeechDetectedEventArgs
• AudioPosition
• RecognizerAudioPosition