RecognizedAudio.GetRange(TimeSpan, TimeSpan) 方法

定義

命名空間:

System.Speech.Recognition

組件:

System.Speech.dll

套件:

System.Speech v9.0.0-preview.4.24266.19

來源:

RecognizedAudio.cs

選取並傳回目前所辨識的音訊區段做為二進位資料。

public:
 System::Speech::Recognition::RecognizedAudio ^ GetRange(TimeSpan audioPosition, TimeSpan duration);

public System.Speech.Recognition.RecognizedAudio GetRange (TimeSpan audioPosition, TimeSpan duration);

member this.GetRange : TimeSpan * TimeSpan -> System.Speech.Recognition.RecognizedAudio

Public Function GetRange (audioPosition As TimeSpan, duration As TimeSpan) As RecognizedAudio

參數

audioPosition

TimeSpan

要傳回音訊資料的起點。

duration

TimeSpan

要傳回之區段的長度。

傳回

RecognizedAudio

傳回已辨識的音訊子區段，如 audioPosition 和 duration 所定義。

例外狀況

ArgumentOutOfRangeException

audioPosition與duration定義一段超出目前區段範圍的音訊。

InvalidOperationException

目前所辨識的音訊不含任何資料。

範例

下列範例會建立名稱輸入的 SpeechRecognized 語音辨識文法、新增 事件的處理常式，並將文法載入至進程語音辨識器。 然後，它會將輸入名稱部分的音訊資訊寫入音訊檔案。 音訊檔案會當做 物件的輸入 SpeechSynthesizer 使用，該物件會說出包含錄製音訊的片語。

private static void AddNameGrammar(SpeechRecognitionEngine recognizer)  
{  
  GrammarBuilder builder = new GrammarBuilder();  
  builder.Append("My name is");  
  builder.AppendWildcard();  

  Grammar nameGrammar = new Grammar(builder);  
  nameGrammar.Name = "Name Grammar";  
  nameGrammar.SpeechRecognized +=  
    new EventHandler<SpeechRecognizedEventArgs>(  
      NameSpeechRecognized);  

  recognizer.LoadGrammar(nameGrammar);  
}  

// Handle the SpeechRecognized event of the name grammar.  
private static void NameSpeechRecognized(  
  object sender, SpeechRecognizedEventArgs e)  
{  
  Console.WriteLine("Grammar ({0}) recognized speech: {1}",  
    e.Result.Grammar.Name, e.Result.Text);  

  try  
  {  

    // The name phrase starts after the first three words.  
    if (e.Result.Words.Count < 4)  
    {  

      // Add code to check for an alternate that contains the wildcard.  
      return;  
    }  

    RecognizedAudio audio = e.Result.Audio;  
    TimeSpan start = e.Result.Words[3].AudioPosition;  
    TimeSpan duration = audio.Duration - start;  

    // Add code to verify and persist the audio.  
    string path = @"C:\temp\nameAudio.wav";  
    using (Stream outputStream = new FileStream(path, FileMode.Create))  
    {  
      RecognizedAudio nameAudio = audio.GetRange(start, duration);  
      nameAudio.WriteToWaveStream(outputStream);  
      outputStream.Close();  
    }  

    Thread testThread =  
      new Thread(new ParameterizedThreadStart(TestAudio));  
    testThread.Start(path);  
  }  
  catch (Exception ex)  
  {  
    Console.WriteLine("Exception thrown while processing audio:");  
    Console.WriteLine(ex.ToString());  
  }  
}  

// Use the speech synthesizer to play back the .wav file  
// that was created in the SpeechRecognized event handler.  

private static void TestAudio(object item)  
{  
  string path = item as string;  
  if (path != null && File.Exists(path))  
  {  
    SpeechSynthesizer synthesizer = new SpeechSynthesizer();  
    PromptBuilder builder = new PromptBuilder();  
    builder.AppendText("Hello");  
    builder.AppendAudio(path);  
    synthesizer.Speak(builder);  
  }  
}  

另請參閱

• WriteToWaveStream(Stream)
• WriteToAudioStream(Stream)