SpeechRecognitionEngine.AudioPosition 属性

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

public TimeSpan AudioPosition { get; }

member this.AudioPosition : TimeSpan

Public ReadOnly Property AudioPosition As TimeSpan

属性值

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