SpeechRecognitionEngine.InitialSilenceTimeout 属性

定义

获取或设置时间间隔,在此时间间隔内,SpeechRecognitionEngine 将在终结识别之前接受仅包含无声段的输入。

public:
 property TimeSpan InitialSilenceTimeout { TimeSpan get(); void set(TimeSpan value); };
public TimeSpan InitialSilenceTimeout { get; set; }
member this.InitialSilenceTimeout : TimeSpan with get, set
Public Property InitialSilenceTimeout As TimeSpan

属性值

安静间隔的持续时间。

例外

该属性已设置为小于 0 秒。

示例

以下示例演示演示基本语音识别的控制台应用程序的一部分。 该示例在启动语音识别之前设置 BabbleTimeoutSpeechRecognitionEngineInitialSilenceTimeout 属性。 语音识别器和AudioStateChangedRecognizeCompleted事件的处理程序将事件信息输出到控制台,以演示属性的属性SpeechRecognitionEngine如何影响InitialSilenceTimeout识别操作。

using System;
using System.Speech.Recognition;

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

      // Initialize an in-process speech recognizer.
      using (SpeechRecognitionEngine recognizer =
        new SpeechRecognitionEngine(
          new System.Globalization.CultureInfo("en-US")))
      {
        // Load a Grammar object.
        recognizer.LoadGrammar(CreateServicesGrammar("FindServices"));

        // Add event handlers.
        recognizer.AudioStateChanged +=
          new EventHandler<AudioStateChangedEventArgs>(
            AudioStateChangedHandler);
        recognizer.RecognizeCompleted +=
          new EventHandler<RecognizeCompletedEventArgs>(
            RecognizeCompletedHandler);

        // Configure input to the speech recognizer.
        recognizer.SetInputToDefaultAudioDevice();

        recognizer.InitialSilenceTimeout = TimeSpan.FromSeconds(3);
        recognizer.BabbleTimeout = TimeSpan.FromSeconds(2);
        recognizer.EndSilenceTimeout = TimeSpan.FromSeconds(1);
        recognizer.EndSilenceTimeoutAmbiguous = TimeSpan.FromSeconds(1.5);

        Console.WriteLine("BabbleTimeout: {0}", recognizer.BabbleTimeout);
        Console.WriteLine("InitialSilenceTimeout: {0}", recognizer.InitialSilenceTimeout);
        Console.WriteLine("EndSilenceTimeout: {0}", recognizer.EndSilenceTimeout);
        Console.WriteLine("EndSilenceTimeoutAmbiguous: {0}", recognizer.EndSilenceTimeoutAmbiguous);
        Console.WriteLine();

        // Start asynchronous speech recognition.
        recognizer.RecognizeAsync(RecognizeMode.Single);

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

    // Create a grammar and build it into a Grammar object.
    static Grammar CreateServicesGrammar(string grammarName)
    {

      // Create a grammar for finding services in different cities.
      Choices services = new Choices(new string[] { "restaurants", "hotels", "gas stations" });
      Choices cities = new Choices(new string[] { "Seattle", "Boston", "Dallas" });

      GrammarBuilder findServices = new GrammarBuilder("Find");
      findServices.Append(services);
      findServices.Append("near");
      findServices.Append(cities);

      // Create a Grammar object from the GrammarBuilder.
      Grammar servicesGrammar = new Grammar(findServices);
      servicesGrammar.Name = ("FindServices");
      return servicesGrammar;
    }

    // Handle the AudioStateChanged event.
    static void AudioStateChangedHandler(
      object sender, AudioStateChangedEventArgs e)
    {
      Console.WriteLine("AudioStateChanged ({0}): {1}",
        DateTime.Now.ToString("mm:ss.f"), e.AudioState);
    }

    // Handle the RecognizeCompleted event.
    static void RecognizeCompletedHandler(
      object sender, RecognizeCompletedEventArgs e)
    {
      Console.WriteLine("RecognizeCompleted ({0}):",
        DateTime.Now.ToString("mm:ss.f"));

      string resultText;
      if (e.Result != null) { resultText = e.Result.Text; }
      else { resultText = "<null>"; }

      Console.WriteLine(
        " BabbleTimeout: {0}; InitialSilenceTimeout: {1}; Result text: {2}",
        e.BabbleTimeout, e.InitialSilenceTimeout, resultText);
      if (e.Error != null)
      {
        Console.WriteLine(" Exception message: ", e.Error.Message);
      }

      // Start the next asynchronous recognition operation.
      ((SpeechRecognitionEngine)sender).RecognizeAsync(RecognizeMode.Single);
    }
  }
}

注解

每个语音识别器都有一种算法来区分沉默和语音。 如果识别器输入在初始静音超时期间处于静音状态,则识别器将完成该识别操作。

如果初始静音超时间隔设置为 0,则识别器不会检查执行初始静音超时。 超时间隔可以是任何非负值。 默认值为 0 秒。

适用于

另请参阅