SpeechRecognitionEngine.InitialSilenceTimeout 屬性

定義

命名空間:

System.Speech.Recognition

組件:

System.Speech.dll

套件:

System.Speech v9.0.0-preview.3.24172.9

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)