SpeechRecognitionEngine.AudioPosition 属性

定义

命名空间:

System.Speech.Recognition

程序集:

System.Speech.dll

包:

System.Speech v9.0.0-rc.2.24473.5

Source:

SpeechRecognitionEngine.cs

获取音频流中的当前位置，此音频流由向 SpeechRecognitionEngine 提供输入的设备产生。

public:
 property TimeSpan AudioPosition { TimeSpan get(); };

public TimeSpan AudioPosition { get; }

member this.AudioPosition : TimeSpan

Public ReadOnly Property AudioPosition As TimeSpan

属性值

TimeSpan

输入设备生成的音频流中的当前位置。

示例

在以下示例中，进程内语音识别器使用听写语法来匹配语音输入。 当语音识别器在其输入处检测到语音时，事件的处理程序SpeechDetected会将 、 RecognizerAudioPosition和 AudioLevel 写入控制台AudioPosition。

using System;  
using System.Speech.Recognition;  

namespace SampleRecognition  
{  
  class Program  
  {  
    private static SpeechRecognitionEngine recognizer;  
    public static void Main(string[] args)  
    {  

      // Initialize an in-process speech recognition engine for US English.  
      using (recognizer = new SpeechRecognitionEngine(  
        new System.Globalization.CultureInfo("en-US")))  
      {  
        recognizer.SetInputToDefaultAudioDevice();  

        // 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 and load it to the recognizer.  
        Grammar servicesGrammar = new Grammar(findServices);  
        recognizer.LoadGrammarAsync(servicesGrammar);  

        // Add handlers for events.  
        recognizer.SpeechRecognized +=  
          new EventHandler<SpeechRecognizedEventArgs>(recognizer_SpeechRecognized);  
        recognizer.SpeechDetected +=  
          new EventHandler<SpeechDetectedEventArgs>(recognizer_SpeechDetected);  

        // Start asynchronous recognition.  
        recognizer.RecognizeAsync();  
        Console.WriteLine("Starting asynchronous recognition...");  

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

    // Gather information about detected speech and write it to the console.  
    static void recognizer_SpeechDetected(object sender, SpeechDetectedEventArgs e)  
    {  
      Console.WriteLine();  
      Console.WriteLine("Speech detected:");  
      Console.WriteLine("  Audio level: " + recognizer.AudioLevel);  
      Console.WriteLine("  Audio position at the event: " + e.AudioPosition);  
      Console.WriteLine("  Current audio position: " + recognizer.AudioPosition);  
      Console.WriteLine("  Current recognizer audio position: " +   
        recognizer.RecognizerAudioPosition);  
    }  

    // Write the text of the recognition result to the console.  
    static void recognizer_SpeechRecognized(object sender, SpeechRecognizedEventArgs e)  
    {  
      Console.WriteLine("\nSpeech recognized: " + e.Result.Text);  

      // Add event handler code here.  
    }  
  }  
}  

注解

属性 AudioPosition 引用输入设备在其生成的音频流中的位置。 相比之下， RecognizerAudioPosition 属性引用识别器在其音频输入中的位置。 这些位置可能不同。 例如，如果识别器收到了尚未生成识别结果的输入， RecognizerAudioPosition 则属性的值小于属性的值 AudioPosition 。

另请参阅

• RecognizerAudioPosition
• AudioPosition