Provides information for the SpeechRecognitionRejected event.
Inheritance Hierarchy
System..::..EventArgs
Microsoft.Speech.Recognition..::..RecognitionEventArgs
Microsoft.Speech.Recognition..::..SpeechRecognitionRejectedEventArgs
Namespace:
Microsoft.Speech.Recognition
Assembly:
Microsoft.Speech (in Microsoft.Speech.dll)
Syntax
| Visual Basic (Declaration) |
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<SerializableAttribute> _ Public Class SpeechRecognitionRejectedEventArgs _ Inherits RecognitionEventArgs |
| Visual Basic (Usage) |
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Dim instance As SpeechRecognitionRejectedEventArgs |
| C# |
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[SerializableAttribute] public class SpeechRecognitionRejectedEventArgs : RecognitionEventArgs |
Remarks
An instance of SpeechRecognitionRejectedEventArgs is created when the SpeechRecognitionEngine object raises the SpeechRecognitionRejected event at the completion of a RecognizeAsync()()()() operation.
The SpeechRecognitionEngine raises the SpeechRecognitionRejected when none of the Alternates generated by a recognition operation have a high enough Confidence score to be accepted. To obtain detailed information about rejected phrases, access the Result property in the handler for the event.
SpeechRecognitionRejectedEventArgs derives from RecognitionEventArgs.
Examples
The following example recognizes phrases such as "Display the list of artists in the jazz category" or "Display albums gospel". The example uses a handler for the SpeechRecognitionRejected event to display a notification in the console when the speech input cannot be matched to the contents of the grammar with sufficient Confidence to produce a successful recognition. The handler also displays recognition result Alternates that were rejected because of low confidence scores.
| Copy Code | |
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using System;
using Microsoft.Speech.Recognition;
namespace SampleRecognition
{
class Program
{
static void Main(string[] args)
// Initialize a SpeechRecognitionEngine object.
{
using (SpeechRecognitionEngine recognizer =
new SpeechRecognitionEngine(new System.Globalization.CultureInfo("en-US")))
{
// Create a grammar.
// Create lists of alternative choices.
Choices listTypes = new Choices(new string[] { "albums", "artists" });
Choices genres = new Choices(new string[] {
"blues", "classical", "gospel", "jazz", "rock" });
// Create a GrammarBuilder object and assemble the grammar components.
GrammarBuilder mediaMenu = new GrammarBuilder("Display");
mediaMenu.Append("the list of", 0, 1);
mediaMenu.Append(listTypes);
mediaMenu.Append("in the", 0, 1);
mediaMenu.Append(genres);
mediaMenu.Append("category", 0, 1);
// Build a Grammar object from the GrammarBuilder.
Grammar mediaMenuGrammar = new Grammar(mediaMenu);
mediaMenuGrammar.Name = "Media Chooser";
// Attach event handlers.
recognizer.SpeechRecognized +=
new EventHandler<SpeechRecognizedEventArgs>(recognizer_SpeechRecognized);
recognizer.SpeechRecognitionRejected +=
new EventHandler<SpeechRecognitionRejectedEventArgs>(recognizer_SpeechRecognitionRejected);
// Load the grammar object to the recognizer.
recognizer.LoadGrammarAsync(mediaMenuGrammar);
// Set the input to the recognizer.
recognizer.SetInputToDefaultAudioDevice();
// Start asynchronous, continuous recognition.
recognizer.RecognizeAsync(RecognizeMode.Multiple);
Console.WriteLine("Starting asynchronous recognition...");
// Keep the console window open.
Console.ReadLine();
}
}
// Handle the SpeechRecognitionRejected event.
static void recognizer_SpeechRecognitionRejected(object sender, SpeechRecognitionRejectedEventArgs e)
{
Console.WriteLine("Speech input was rejected.");
foreach (RecognizedPhrase phrase in e.Result.Alternates)
{
Console.WriteLine(" Rejected phrase: " + phrase.Text);
Console.WriteLine(" Confidence score: " + phrase.Confidence);
Console.WriteLine(" Grammar name: " + phrase.Grammar.Name);
}
}
// Handle the SpeechRecognized event.
static void recognizer_SpeechRecognized(object sender, SpeechRecognizedEventArgs e)
{
Console.WriteLine("Speech recognized: " + e.Result.Text);
Console.WriteLine(" Confidence score: " + e.Result.Confidence);
}
}
}
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Thread Safety
See Also
