SpeechRecognitionEngine.InitialSilenceTimeout 屬性

定義

命名空間:

System.Speech.Recognition

組件:

System.Speech.dll

套件:

System.Speech v10.0.0

來源:

SpeechRecognitionEngine.cs

取得或設定完成辨識前 SpeechRecognitionEngine 接受只包含靜音之輸入的時間間隔。

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

屬性值

TimeSpan

無回應間隔的持續時間。

例外狀況

ArgumentOutOfRangeException

這個屬性設定為小於 0 秒。

範例

下列範例顯示示範基本語音辨識的主控台應用程式的一部分。 此範例會在 BabbleTimeout 起始語音辨識之前，先設定 的 SpeechRecognitionEngine 和 InitialSilenceTimeout 屬性。 語音辨識器的 AudioStateChanged 處理常式和 RecognizeCompleted 事件輸出事件資訊至主控台，以示範屬性的屬性 SpeechRecognitionEngine 如何影響 InitialSilenceTimeout 辨識作業。

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);
    }
  }
}

備註

每個語音辨識器都有一個演算法，可區分無聲和語音。 如果辨識器輸入在初始無回應逾時期間為無聲，則辨識器會完成該辨識作業。

• 針對非同步辨識作業和模擬，辨識器會 RecognizeCompleted 引發 事件，其中 RecognizeCompletedEventArgs.InitialSilenceTimeout 屬性為 true ，而 RecognizeCompletedEventArgs.Result 屬性為 null 。

• 針對同步辨識作業和模擬，辨識器會 null 傳回 ，而不是有效的 RecognitionResult 。

如果初始無聲逾時間隔設定為 0，辨識器不會執行初始無聲逾時檢查。 逾時間隔可以是任何非負值。 預設值為 0 秒。

另請參閱

• BabbleTimeout
• EndSilenceTimeout
• EndSilenceTimeoutAmbiguous
• Recognize()
• EmulateRecognize(RecognizedWordUnit[], CompareOptions)
• RecognizeAsync()
• EmulateRecognizeAsync(RecognizedWordUnit[], CompareOptions)