RecognizedAudio.GetRange(TimeSpan, TimeSpan) Metod

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

Parametrar

Returer

Returnerar ett underavsnitt av det igenkända ljudet enligt definitionen av audioPosition och duration.

Undantag

Exempel

I följande exempel skapas en grammatik för taligenkänning för namnindata, lägger till en hanterare för SpeechRecognized händelsen och läser in grammatiken i en taligenkänning under processen. Sedan skriver den ljudinformationen för namndelen av indata till en ljudfil. Ljudfilen används som indata till ett SpeechSynthesizer objekt, som talar en fras som innehåller det inspelade ljudet.

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);
  }
}

Se även

• WriteToWaveStream(Stream)
• WriteToAudioStream(Stream)