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Microsoft Speech SDK

Interface: ISpeechRecognizer

GetFormat Method

The GetFormat method returns the current input audio format.

The sound format may be different at different times or at different points during processing. For example, the audio format at the time the input reaches the sound device (the audio card for instance) may differ from the audio format by the time it reaches the speech recognition (SR) engine. GetFormat specifies which location should be polled and returns the audio format for that location.

SpeechRecognizer.GetFormat(
     Type As SpeechFormatType
) As SpAudioFormat

Parameters

Type

Request for the audio format at entering the sound device or SR engine.

Return Value

The GetFormat method returns an SpAudioFormat variable.

Example

This code sample demonstrates the GetFormat method. After a successful recognition, two GetFormat calls poll SAPI for the audio formats of the sound device and the SR engine and display results in a label.

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.

Public WithEvents RC As SpSharedRecoContext
Public myGrammar As ISpeechRecoGrammar

Private Sub Form_Load()
    Set RC = New SpSharedRecoContext
    Set myGrammar = RC.CreateGrammar
    
    myGrammar.DictationSetState SGDSActive
    
End Sub

Private Sub RC_Recognition(ByVal StreamNumber As Long, ByVal StreamPosition As Variant, ByVal RecognitionType As SpeechLib.SpeechRecognitionType, ByVal Result As SpeechLib.ISpeechRecoResult)
    Dim audioFormat As SpAudioFormat
    
    Label1.Caption = Result.PhraseInfo.GetText
    
    Set audioFormat = RC.Recognizer.GetFormat(SFTInput)
    audioFormatType = audioFormat.Type
    Label2.Caption = "Audio input type: " & audioFormat.Type & vbCrLf
    
    Set audioFormat = RC.Recognizer.GetFormat(SFTSREngine)
    audioFormatType = audioFormat.Type
    Label2.Caption = Label2.Caption & "SR engine input type: " & audioFormat.Type
End Sub