SpeechRecognitionEngine.SpeechDetected 事件

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 Custom Event SpeechDetected As EventHandler(Of SpeechDetectedEventArgs) 

Public Event SpeechDetected As EventHandler(Of SpeechDetectedEventArgs) 

事件类型

示例

以下示例是控制台应用程序的一部分，用于为航班选择出发地和目的地城市。 该应用程序识别“我想从迈阿密飞往芝加哥”等短语。该示例使用 SpeechDetected 事件来报告 AudioPosition 每次检测到语音时。

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 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);

        // Set the input to the recognizer.
        recognizer.SetInputToDefaultAudioDevice();

        // Start recognition.
        recognizer.RecognizeAsync();

        // 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);
    }
  }
}

注解

每个语音识别器都有一种算法来区分沉默和语音。 SpeechRecognitionEngine执行语音识别操作时，当其算法将输入标识为语音时，它会引发 SpeechDetected 事件。 AudioPosition关联SpeechDetectedEventArgs对象的 属性指示输入流中识别器检测到语音的位置。 在SpeechRecognitionEngine引发SpeechDetected任何 、 SpeechRecognized或 SpeechRecognitionRejected 事件之前引发 SpeechHypothesized事件。

有关详细信息， Recognize请参阅 、 RecognizeAsync、 EmulateRecognize和 EmulateRecognizeAsync 方法。

创建 SpeechDetected 委托时，需要标识将处理该事件的方法。 若要将事件与事件处理程序关联，请将该委托的一个实例添加到事件中。 除非移除了该委托，否则每当发生该事件时就会调用事件处理程序。 有关事件处理程序委托的详细信息，请参阅 事件和委托。

另请参阅

• SpeechDetectedEventArgs
• Recognize()
• RecognizeAsync()
• EmulateRecognize(String)
• EmulateRecognizeAsync(String)
• SpeechHypothesized
• SpeechRecognitionRejected
• SpeechRecognized