Calculator using Speech Recognition in C#

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I'm trying to do a calculator using speech recognition, so it can be managed through voice. So for example, the user says "How much is 56 times 90?", the application should answer "5040". I gave a look to this: https://msdn.microsoft.com/en-us/library/office/hh538500(v=office.14).aspx[^]

It was something useful, but I did not know how to integrate it to my app (windows form). I have used the Speech namespace, but in this case, I get confused about how to use the grammar created in the msdn article.

Thanks in Advance! - CCB

Posted 27-May-15 12:18pm

ChrisCreateBoss

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Sergey Alexandrovich Kryukov · Accepted Answer · 2015-05-27T12:39:00

This is how:
https://msdn.microsoft.com/en-us/library/system.speech.recognition%28v=vs.110%29.aspx[^]:
https://msdn.microsoft.com/en-us/library/system.speech.recognition.speechrecognizer(v=vs.110).aspx[^],
or https://msdn.microsoft.com/en-us/library/system.speech.recognition.speechrecognitionengine(v=vs.110).aspx[^].

Be careful with these two recognizers: one can work only in STA thread and another one only in MTA thread. Unfortunately, MSDN documentation keeps silence about it. This is not If this contradicts to the compatible Apartment States of the UI library you are using, you can always use a separate thread and set its Apartment State before starting it:
https://msdn.microsoft.com/en-us/library/system.threading.thread.setapartmentstate%28v=vs.110%29.aspx[^].

Another advice: the recognition fidelity is quite far from perfect. Too complex grammar can easily confuse your recognizer. So, better limit the functionality by figures, names of arithmetic operators and limited number of commands. Most complex problem I expect would be recognition of big numbers. You cannot fit too many of them in grammar. So, you may want to start with entering numbers digit by digit.

—SA