C# Speech Recognition

Question

Where can I find references and full documentation for the C# speech recognition namespace. MSDN only provides a very brief description of the members and nothing more from what I can find. Is there an absolute resource for theses kinds of things. Mostly everything I'm learning is from other tutorials or snippets in forums.

Answer 1

Intro: Speech Recognition

Code examples covering most of the basics:

Getting Started with Speech Recognition

The basic operations that speech recognition applications perform: - Starting the speech recognizer.

• Creating a recognition grammar.

• Loading the grammar into a speech recognizer.

• Registering for speech recognition event notification.

• Creating a handler for the speech recognition event.

Answer 2

I found that the latest MSDN pages on System.Speech.Recognition for .NET 4 are skimpy on the details, but the older pages for .NET 3.5 have more details. For a quick comparison I just grabbed these two pages:

• RecognitionResult Class - .NET 3.5 - http://msdn.microsoft.com/en-us/library/system.speech.recognition.recognitionresult(v=VS.90).aspx

vs.

• RecognitionResult Class - .NET 4.0 - http://msdn.microsoft.com/en-us/library/system.speech.recognition.recognitionresult(v=VS.100).aspx

The .NET 3.5 docs have detailed remarks and examples. The .NET 4.0 versions just have definitions.

I found the helpfile that comes with the Server Speech Platform SDK has details that the .NET 4.0 MSDN pages leave off - http://www.microsoft.com/downloads/en/details.aspx?FamilyID=1b1604d3-4f66-4241-9a21-90a294a5c9a4 .

To get started with .NET speech, there is a very good article that was published a few years ago at http://msdn.microsoft.com/en-us/magazine/cc163663.aspx . It is probably the best introductory article I've found so far. It is a little out of date, but very helfpul. (The AppendResultKeyValue method was dropped after the beta and likely other breaking changes.)

Answer 3

Firstly, you add the library for Speech Recognition.

using System.Speech.Recognition

If you cannot load the library, you can add it by using add reference. Go

Project>Add Reference>Browse

Generally, System.Speech.dll is in C:\\Program Files\\Reference Assemblies\\Microsoft\\Framework\\v3.0

Here, the example code that recognizes "Yes","No","In","Out" is below:

namespace SpeechRecognition
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            SpeechRecognizer sr = new SpeechRecognizer();
            Choices ch = new Choices();
            ch.Add(new string[] { "yes", "no","in","out" });

            GrammarBuilder gb = new GrammarBuilder();
            gb.Append(ch);

            Grammar gr = new Grammar(gb);

            sr.LoadGrammar(gr);

            sr.SpeechRecognized += new EventHandler<SpeechRecognizedEventArgs>(sr_SpeechRecognition);

        }

        private void sr_SpeechRecognition(object sender, SpeechRecognizedEventArgs e)
        {
            MessageBox.Show(e.Result.Text);

        }
    }
}