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RecognitionResult.GetAudioForWordRange Method

  • Reference

Definition

Namespace:
System.Speech.Recognition
Assembly:
System.Speech.dll
Package:
System.Speech v8.0.0
Package:
System.Speech v9.0.0-rc.2.24473.5
Source:
RecognitionResult.cs
Source:
RecognitionResult.cs

Gets a section of the audio that is associated with a specific range of words in the recognition result.

public:
 System::Speech::Recognition::RecognizedAudio ^ GetAudioForWordRange(System::Speech::Recognition::RecognizedWordUnit ^ firstWord, System::Speech::Recognition::RecognizedWordUnit ^ lastWord);
public System.Speech.Recognition.RecognizedAudio GetAudioForWordRange (System.Speech.Recognition.RecognizedWordUnit firstWord, System.Speech.Recognition.RecognizedWordUnit lastWord);
member this.GetAudioForWordRange : System.Speech.Recognition.RecognizedWordUnit * System.Speech.Recognition.RecognizedWordUnit -> System.Speech.Recognition.RecognizedAudio
Public Function GetAudioForWordRange (firstWord As RecognizedWordUnit, lastWord As RecognizedWordUnit) As RecognizedAudio

Parameters

firstWord
RecognizedWordUnit

The first word in the range.

lastWord
RecognizedWordUnit

The last word in the range.

Returns

RecognizedAudio

The section of audio associated with the word range.

Exceptions

NullReferenceException

The recognizer generated the result from a call to EmulateRecognize or EmulateRecognizeAsync methods of the SpeechRecognizer or SpeechRecognitionEngine objects.

Examples

The following example creates a grammar to accept name input and attaches to it a handler for the SpeechRecognized event. The grammar uses a wildcard for the name element of the phrase. The event handler uses the audio from the wildcard to create and play a greeting prompt.

private Grammar CreateNameInputGrammar()  
{  
  GrammarBuilder wildcardBuilder = new GrammarBuilder();  
  wildcardBuilder.AppendWildcard();  
  SemanticResultKey nameKey =  
    new SemanticResultKey("Name", wildcardBuilder);  

  GrammarBuilder nameBuilder =  
    new GrammarBuilder("My name is");  
  nameBuilder.Append(nameKey);  

  Grammar nameGrammar = new Grammar(nameBuilder);  
  nameGrammar.Name = "Name input";  

  nameGrammar.SpeechRecognized +=  
    new EventHandler<SpeechRecognizedEventArgs>(  
      NameInputHandler);  

  return nameGrammar;  
}  

// Handle the SpeechRecognized event for the name grammar.  
private void NameInputHandler(object sender, SpeechRecognizedEventArgs e)  
{  
  if (e.Result == null) return;  

  RecognitionResult result = e.Result;  
  SemanticValue semantics = e.Result.Semantics;  

  if (semantics.ContainsKey("Name"))  
  {  
    RecognizedAudio nameAudio =  
      result.GetAudioForWordRange(  
        result.Words[3], result.Words[result.Words.Count - 1]);  

    // Save the audio. Create a directory and file as necessary.  
    FileInfo fi = new FileInfo(@"C:\temp\temp.wav");  
    if (!fi.Directory.Exists)  
    {  
      fi.Directory.Create();  
    }  
    FileStream stream = new FileStream(fi.FullName, FileMode.Create);  
    nameAudio.WriteToWaveStream(stream);  
    stream.Close();  

    // Greet the person using the saved audio.  
    SpeechSynthesizer synthesizer = new SpeechSynthesizer();  
    PromptBuilder builder = new PromptBuilder();  
    builder.AppendText("Hello");  
    builder.AppendAudio(fi.FullName);  
    synthesizer.Speak(builder);  
  }  
}

Remarks

To get the complete audio associated with the recognition result, use the Audio property.

Applies to

See also