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Microsoft Speech SDK

Interface: ISpeechRecognizer

State Property

The State property returns the current state of the recognition engine.

The recognition engine may be in one of several states of audio processing. If active, the engine receives audio data and processes it. Likewise, if inactive, neither audio data nor additional processing takes place. See the enumeration SpeechRecognizerState for complete details of the states.

Syntax

Parts

SpeechRecognizer

The owning object.

SpeechRecognizerState

Set: A SpeechRecognizerState variable that sets the property.
Get: A SpeechRecognizerState variable that gets the property.

Example

This code sample demonstrates the State method. After creating an instance for a recognizer, State retrieves the processing state about the recognizer. The recognizer may be turned on and off with the button and the current state will be displayed afterward. Speech will be recognized and displayed but only when the engine is active.

To run this code, create a form with the following controls:

Paste this code into the Declarations section of the form.

The Form_Load procedure creates the recognizer. Click the button to toggle the engine on and off. Speaking while the engine is active will display the text in the second label.

Public WithEvents RC As SpSharedRecoContext
Public myGrammar As ISpeechRecoGrammar

Private Sub Command1_Click()
    If Label1.Caption = 1 Then
        RC.Recognizer.State = SRSInactive
    Else
        RC.Recognizer.State = SRSActive
    End If
    
    ShowState
    RenameButton
End Sub

Private Sub Form_Load()
    Set RC = New SpSharedRecoContext
    
    Set myGrammar = RC.CreateGrammar
    myGrammar.DictationSetState SGDSActive
    
    Dim recoState As SpeechRecognizerState
    recoState = RC.Recognizer.State
    
    ShowState
    RenameButton
End Sub

Private Function RenameButton()
    If Label1.Caption = 1 Then
        Command1.Caption = "Turn Off Engine"
    Else
        Command1.Caption = "Turn On Engine"
    End If
End Function

Private Function ShowState()
    Dim engineState As SpeechRecognizerState
    Label1.Caption = RC.Recognizer.State
End Function

Private Sub RC_Recognition(ByVal StreamNumber As Long, ByVal StreamPosition As Variant, ByVal RecognitionType As SpeechLib.SpeechRecognitionType, ByVal Result As SpeechLib.ISpeechRecoResult)
    Label2.Caption = Result.PhraseInfo.GetText
End Sub