SpeechHypothesized Event

SpeechRecognitionEngine.SpeechHypothesized Event

Event raised when when the recognition engine detects speech and part of the audio input speech has been tentatively recognized.

Namespace: System.Speech.Recognition
Assembly: System.Speech (in system.speech.dll)

public event EventHandler<SpeechHypothesizedEventArgs> SpeechHypothesized
/** @event */
public void add_SpeechHypothesized (EventHandler<SpeechHypothesizedEventArgs> value)

/** @event */
public void remove_SpeechHypothesized (EventHandler<SpeechHypothesizedEventArgs> value)

In JScript, you can handle the events defined by a class, but you cannot define your own.
Not applicable.

Handlers of SpeechHypothesized events can obtain the best possible hypothesis phrase through an instance of the RecognitionResult object returned by the Result property of the SpeechHypothesizedEventArgs object passed to the handler. (SpeechHypothesizedEventArgs is derived fromSpeechRecognitionEventArgs)).

Handlling of SpeechHypothesized is not typically required in production running, but is useful when debugging grammars.

The example below shows the subscription of an anonymous method as a handler for SpeechHypothesized, which in turn calls a display function (DisplayResult) to return to the user interface the best candidate and the list of alternates generated.


								_recognizer.SpeechHypothesized +=
delegate(object sender, SpeechHypothesizedEventArgs eventArgs) {

    Utils.DisplayAudioInputFormat(_audioStateLabel, _recognizer);
            DisplayResult(eventArgs);
};

// Displays the semantics, rules, and alternates of the result.
private void DisplayResult(EventArgs eventArgs) {

    //Make sure We handle different event types we support
     RecognitionResult result=null;
    if (null !=(eventArgs as RecognitionEventArgs)) {
result = (eventArgs as RecognitionEventArgs).Result;
    }else if (null !=(eventArgs as EmulateRecognizeCompletedEventArgs)) {
result = (eventArgs as EmulateRecognizeCompletedEventArgs).Result;
    }

    // In all cases, clear results, semantic XML, semantics tree, and alternates.
    _recognitionSmlBrowser.Navigate("about:blank");
    _semanticsTreeView.Nodes.Clear();
    //            _candidateList.Items.Clear();
    _candidateList.DataSource = null;
    _candidateList.DisplayMember = null;
    _phraseInfoLabel.Text = "";
    _bestCandidateTextBox.Text = "";

    if (result != null) {
//If eventArgs not null repopulate displays
//Obtain result from RecognitionEventArg passed in.
//Set Text color on the basis of the event type passed in.

switch (eventArgs.GetType().ToString()) {

    case "System.Speech.Recognition.SpeechHypothesizedEventArgs":
        _bestCandidateTextBox.ForeColor = Color.Black;
        _bestCandidateTextBox.Text = result.Text;
        _phraseInfoLabel.Text = null;
        break;
    case "System.Speech.Recognition.SpeechRecognitionRejectedEventArgs":
        _bestCandidateTextBox.ForeColor = Color.OrangeRed;
        _bestCandidateTextBox.Text = "Unable to Recognize Input";
        _phraseInfoLabel.Text = String.Format("Rejected Phrase Information\n");
        Utils.DisplayBasicPhraseInfo(_phraseInfoLabel, result);
        Utils.DisplaySemanticsSML(_recognitionSmlBrowser, result);
        Utils.DisplaySemanticsTreeView(_semanticsTreeView, result.Semantics);
        break;
    case "System.Speech.Recognition.SpeechRecognizedEventArgs":
        _bestCandidateTextBox.ForeColor = Color.Green;
        _bestCandidateTextBox.Text = result.Text;
        _phraseInfoLabel.Text = String.Format("Recognized Phrase Information\n");
        Utils.DisplayBasicPhraseInfo(_phraseInfoLabel, result);
        Utils.DisplaySemanticsSML(_recognitionSmlBrowser, result);
        Utils.DisplaySemanticsTreeView(_semanticsTreeView, result.Semantics);
        break;
    case "System.Speech.Recognition.EmulateRecognizeCompletedEventArgs":
        _bestCandidateTextBox.ForeColor = Color.Green;
        _bestCandidateTextBox.Text = result.Text;
        _phraseInfoLabel.Text = String.Format("Recognized Phrase Information\n");
        Utils.DisplayBasicPhraseInfo(_phraseInfoLabel, result);
        Utils.DisplaySemanticsSML(_recognitionSmlBrowser, result);
        Utils.DisplaySemanticsTreeView(_semanticsTreeView, result.Semantics);
        break;
    default:
        _bestCandidateTextBox.ForeColor = Color.Black;
        break;
}

Utils.DisplayDataOnListBox(_candidateList, result.Alternates, "Text");

    }
}

Windows 98, Windows Server 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0

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