RecognizedAudio.GetRange(TimeSpan, TimeSpan) Method

Reference

Definition

Namespace:: System.Speech.Recognition

Assembly:: System.Speech.dll

Package:: System.Speech v9.0.0

Source:: RecognizedAudio.cs

Source:: RecognizedAudio.cs

Source:: RecognizedAudio.cs

Important

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Selects and returns a section of the current recognized audio as binary data.

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

Parameters

audioPosition: TimeSpan

The starting point of the audio data to be returned.

duration: TimeSpan

The length of the segment to be returned.

Returns

RecognizedAudio

Returns a subsection of the recognized audio, as defined by audioPosition and duration.

Exceptions

ArgumentOutOfRangeException

audioPosition and duration define a segment of audio outside the range of the current segment.

InvalidOperationException

The current recognized audio contains no data.

Examples

The following example creates a speech recognition grammar for name input, adds a handler for the SpeechRecognized event, and loads the grammar into an in-process speech recognizer. Then it writes the audio information for the name portion of the input to an audio file. The audio file is used as input to a SpeechSynthesizer object, which speaks a phrase that includes the recorded audio.

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);  
  }  
}

Applies to

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