Speech recognition

•  Natural interaction with your application

•  Grammar-based

•  Requires internet connection

•  Default dictation grammar for free-text and web-search are included in WP8

•  Custom grammar can be defined in two ways:

        – Programmatic list grammar (array of strings)
        – XML grammar leveraging on Speech Recognition Grammar Specification (SRGS) 1.0

• Default dictation grammar

private async void ButtonWeatherSearch_Click(object sender, RoutedEventArgs e) 

{ 

 // Add the pre-defined web search grammar to the grammar set.

SpeechRecognizerUI recoWithUI = new SpeechRecognizerUI();

recoWithUI.Recognizer.Grammars.AddGrammarFromPredefinedType ("weatherSearch", 

SpeechPredefinedGrammar.WebSearch);

// Display text to prompt the user's input.

recoWithUI.Settings.ListenText = "Say what you want to search for"; 

// Display an example of ideal expected input.

recoWithUI.Settings.ExampleText = @"Ex. 'weather for London'"; 

// Load the grammar set and start recognition.

SpeechRecognitionUIResult result = await recoWithUI.RecognizeWithUIAsync(); 

}

• Programmatic list grammar

private async void ButtonSR_Click(object sender, RoutedEventArgs e) 
{ 
SpeechRecognizerUI recoWithUI = new SpeechRecognizerUI();
 // You can create this string dynamically, for example from a movie queue.
string[] movies = { "Play The Cleveland Story", "Play The Office", "Play Psych", "Play Breaking Bad", "Play Valley of the Sad", "Play Shaking Mad" };
 // Create a grammar from the string array and add it to the grammar set.
recoWithUI.Recognizer.Grammars.AddGrammarFromList("myMovieList", movies); 
// Display an example of ideal expected input.
recoWithUI.Settings.ExampleText = @"ex. 'Play New Mocumentaries'"; 
// Load the grammar set and start recognition.
SpeechRecognitionUIResult result = await recoWithUI.RecognizeWithUIAsync(); 
// Play movie given in result.Text
}

• XML grammar

private async void ButtonSR_Click(object sender, EventArgs e)
{
// Initialize objects ahead of time to avoid delays when starting recognition.
SpeeechRecognizerUI recoWithUI = new SpeechRecognizerUI();
// Initialize a URI with a path to the SRGS-compliant XML file.
Uri orderPizza = new Uri("ms-appx:///OrderPizza.grxml", UriKind.Absolute);
// Add an SRGS-compliant XML grammar to the grammar set.
recoWithUI.Recognizer.Grammars.AddGrammarFromUri("PizzaGrammar", orderPizza);
// Preload the grammar set.
await recoWithUI.Recognizer.PreloadGrammarsAsync();
// Display text to prompt the user's input.
recoWithUI.Settings.ListenText = "What kind of pizza do you want?";
// Display an example of ideal expected input.
recoWithUI.Settings.ExampleText = "Large combination with Italian sausage";
SpeechRecognitionUIResult recoResult = await recoWithUI.RecognizeWithUIAsync();
}