How to mix Grammar (Rules) & Dictation (Free speech) with SpeechRecognizer in C#

Question

I really like Microsofts latest speech recognition (and SpeechSynthesis) offerings.

http://msdn.microsoft.com/en-us/library/ms554855.aspx

http://estellasays.

Answer 1

You have two choices:

1. You can use the dictation node for free-text using GrammarBuilder::AppendDictation. The problem is that since the recognizer doesn't have any context, the recognitions aren't the highest quality.
2. You can use a textbuffer node and provide a set of items using GrammarBuilder::Append(String, SubsetMatchingMode). This will give the recognizer enough context to get good quality recognitions without having to rebuild the entire grammar tree every time.

Answer 2

You could try something like this... It specifies a list of known commands.. but also lets you use open dictation afterwards. It expects there to be a command given before the open dictation.. but you could reverse this... and append th However, by adding in a blank in the command type (" ") it will also let you get straight to the dictation part.

Choices commandtype = new Choices();
commandtype.Add("search");
commandtype.Add("print");
commandtype.Add("open");
commandtype.Add("locate");

SemanticResultKey srkComtype = new SemanticResultKey("comtype",commandtype.ToGrammarBuilder());

 GrammarBuilder gb = new GrammarBuilder();
 gb.Culture = System.Globalization.CultureInfo.CreateSpecificCulture("en-GB");
 gb.Append(srkComtype);
 gb.AppendDictation();

 Grammar gr = new Grammar(gb);

then on your recognizer just use the result text etc

private void recognizer_SpeechRecognized(object sender, SpeechRecognizedEventArgs e)
{
    System.Console.WriteLine(e.Result.Text);

}

You can add more choice options, and SemanticResultKeys to the structure to make more complex patterns if you wish. Also a wildcard (e.g. gb.AppendWildcard(); ).