How to distinguish commands from normal conversation - Speech Recognition in C#

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Hi All,

I'm a newbie to both Speech Recognition and C#. I'm working on a project which includes distinguishing commands from normal conversation. I added a custom grammar that indentifies four commands (as of now) namely, 'next', 'previous', 'home', 'end'.

But when I speak some normal sentences/words, the SpeechRecognitionEngine relates the words with those in the customed Grammar and act accordingly. I tried the 'RecognizedWordUnit.Confidence' property as well, it corrected the issue to some level but not fully.

Anybody please suggest, how can I make my Speech Engine to recongnize well just the command words and ignoring the rest of speech.

Thank You

Manjinder

Posted 9-Jun-11 4:14am

grad_stu

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Solution 1

If you're listening for both at the same time, you'll have to put a single word in the command list to get the attention of a seperate command listener.

Basically, you listen for a single word, like "computer" or "command", then when that command is heard, you change out the commands in the list and listen for those specific commands.

Posted 9-Jun-11 4:19am

Dave Kreskowiak

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grad_stu · Accepted Answer · 2011-06-09T04:40:00

I'm listening for some specific words only through SpeechRecognitionEngine. Snippet of my code goes as

RecEngine = new SpeechRecognitionEngine();
RecEngine.SetInputToDefaultAudioDevice();

mygrammar = sampleGrammar();
RecEngine.LoadGrammar(mygrammar);
RecEngine.SpeechRecognized += (s, args) =>
{

foreach (RecognizedWordUnit word in args.Result.Words)
{
if (word.Confidence > 0.9)
output += word.Text;

}
};

private Grammar sampleGrammar()
{
Choices choices = new Choices("next", "previous", "home", "end");
builder = new GrammarBuilder(choices);
Grammar gr = new Grammar(builder);
return gr;
}

So, when i speak some sentence like 'I want rest'. It picks and relates 'rest' as 'next', similarly 'roam' as 'home' etc. I want to improve the Speech Recognition, but not sure how to do that.

Many Thanks!

Manjinder