resetting recognition engine to fewer phrases...

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Ah, so this time it isn't because of some code I wasn't aware of....like maybe there was a refresh() call on the recognizer or something like that needed after UnloadAllGrammers.

I am not exactly sure how to ask the recognizer engine what phrases it works with...

I have code in the Speech_Recognized event to acknowledge when it hears something it recognizes.
So when my grammer doesn't include a phrase and it reacts anyway, I have a problem. (Debugging confirmed it did not just mishear something else...it actually heard and recognized the earlier phrase that was not supposed to be available.)

I had thought earlier that instead of unloading and loading grammers, I should just load all that I would need and enable and disable them as called for. The application should react a little faster and MAYBE that approach will resolve the timing issue as well. I will be working on that this evening.

Thanks for the input. I'll let you know how it turns out.

What happens if you start with the 2nd set of phrases, without loading the 1st set of phrases, does it have the same recognition problem?

ASKER

I think I found part of the solution...there is a property of the recognizer called PauseOnRecognition that can be set to true. Its too soon to tell for sure, but so far, that seems to have helped.

My new approach is not working out quite like I planned. I don't think I quite understand how to work with multiple grammars loaded at the same time, but separating the two groups of phrases into two different grammars and unloading and loading them as needed also seems to be helping.

So I am getting there...I won't have a chance to work on this again until Thursday. Again, thanks for the input. I will let you know how it goes.

I thought you already had the pause in the code:

        
        If Not _recnizer Is Nothing Then
            _recnizer.PauseRecognizerOnRecognition = True
            _recnizer.UnloadAllGrammars()
        End If

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Are you saying that you moved that call to a different point in the process?

ASKER

DOH! I thought I just added that pause for the first time last night. Did not even realize it was already in the orignal code, so I guess that pause is not what is helping after all....sorry, guess I am getting a bit senile....please try to be patient as I dodder along here....

I have never worked with multiple grammars, either, so I am very interested in this process, and the problems that you are experiencing.

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I would love to hear why you need multiple grammars, and to switch between them.

ASKER

Imagine that you cannot use your hands. You cannot push a mute button on your microphone or reach up to take off your headset. When you are controlling your computer, the microphone must be listening all the time. But sometimes you need to talk to someone else in the room. How does the computer "know" when/if you are talking to it and when you are talking to someone else?

My approach is to use two grammars. The first grammar can only recognize an attention phrase (user defined), like "Computer" or "Attention" and a couple of cancel phrases "Never mind" or "Not you".

When an attention phrase is recognized, the second, more extensive grammar is loaded, and interacts with the user until it is no longer needed. Then it is unloaded and the first grammar is loaded again to wait quietly until the second grammar is needed again. The first grammar acts as the gatekeeper.

I can't quite remember, but are you using SpeechRecognitionEngine or SpeechRecognizer?

ASKER

Public WithEvents _recnizer As New Speech.Recognition.SpeechRecognizer

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ASKER

That would probably work, but would not the user have to click a mouse? (No hands, remember?)

Anyway, my approach of loading and unloading the needed grammars seems to work. I have attached some useful code: The function attached displays the available phrases from the currently loaded Grammar. (Its always Grammar(0), since I only use one grammar at a time.)

(FYI, sc is my SpeechClass.)

Public Function DisplayCurrentCommandList(ByRef lex As LastException) As Boolean
        Dim retval As Boolean = True
        Dim strsplit() As String
        Dim cntr As Integer = 0
        Dim str_commands As String = ""
        Dim currentgrammar As System.Speech.Recognition.Grammar



        Try
            currentgrammar = sc._recnizer.Grammars(0)
            Select Case currentgrammar.Name
                Case "Attention Phrases"
                    strsplit = sc.AttentionCommands.ToGrammarBuilder().DebugShowPhrases().Split(",")
                Case "User Phrases"
                    strsplit = sc.UserCommands.ToGrammarBuilder().DebugShowPhrases().Split(",")
               
            End Select

            'eliminate the opening and closing brackets...
            strsplit(0) = Right(strsplit(0), strsplit(0).Length - 1)
            strsplit(strsplit.Length - 1) = Left(strsplit(strsplit.Length - 1), strsplit(strsplit.Length - 1).Length - 1)


            For cntr = 0 To strsplit.Length - 1
                str_commands = str_commands & strsplit(cntr) & vbCrLf
            Next

            frm.TextBoxCommands.Text = str_commands

        Catch ex As Exception

            lex.ErrorMessage = ex.Message
            If Not ex.InnerException Is Nothing Then
                lex.ErrorMessage = lex.ErrorMessage & vbCrLf & ex.InnerException.Message
            End If
            retval = False
        End Try

        Return retval
    End Function

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