I am working on the following code
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Speech.Recognition;
using System.Speech.Synthesis;
using System.Windows.Forms;
using System.IO;
namespace US_Speech_Recognizer
{
public class RecognizeSpeech
{
private SpeechRecognitionEngine sEngine; //Speech recognition engine
private SpeechSynthesizer sSpeak; //Speech synthesizer
string text3 = "";
public RecognizeSpeech()
{
//Make the recognizer ready
sEngine = new SpeechRecognitionEngine(new System.Globalization.CultureInfo("en-US"));
//Load grammar
Choices sentences = new Choices();
sentences.Add(new string[] { "I am hungry" });
GrammarBuilder gBuilder = new GrammarBuilder(sentences);
Grammar g = new Grammar(gBuilder);
sEngine.LoadGrammar(g);
//Add a handler
sEngine.SpeechRecognized +=new EventHandler<SpeechRecognizedEventArgs>(sEngine_SpeechRecognized);
sSpeak = new SpeechSynthesizer();
sSpeak.Rate = -2;
//Computer speaks the words to get the phones
Stream stream = new MemoryStream();
sSpeak.SetOutputToWaveStream(stream);
sSpeak.Speak("I was hungry");
stream.Position = 0;
sSpeak.SetOutputToNull();
//Configure the recognizer to stream
sEngine.SetInputToWaveStream(stream);
sEngine.RecognizeAsync(RecognizeMode.Single);
}
//Start the speech recognition task
private void sEngine_SpeechRecognized(object sender, SpeechRecognizedEventArgs e)
{
string text = "";
if (e.Result.Text == "I am hungry")
{
foreach (RecognizedWordUnit wordUnit in e.Result.Words)
{
text = text + wordUnit.Pronunciation + "\n";
}
MessageBox.Show(e.Result.Text + "\n" + text);
}
}
}
}
In here, the grammar is I am hungry but the computer is asked to speak I was hungry. But the case is, the recognition event get fired and says the text is exact equal to I am hungry. In the output box, you can check the phonemes as well!
The only way to avoid this is loading DictationGrammar
I thought providing custom grammar is the best way to restrict the application from listening to everything not needed, but it seems like custom grammar is failing!
My question is, is there a way to avoid this? Why this is happening?