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Microsoft Speech SDK

Object: SpVoice

AudioOutput Property

The AudioOutput property gets and sets the current audio output object used by the voice.

The AudioOutput property can be set with the object token for a standard Windows multi-media device. To use other types of devices, please see the Speech Telephony Application Guide.

Syntax

Parts

SpVoice

The owning object.

SpObjectToken

Get: An SpObjectToken object that gets the current audio output.
Set: An SpObjectToken object that sets the audio output.

Remarks

When setting the value, if the object is Nothing then the default audio device will be used.

Example

The following Visual Basic form code demonstrates the use of the GetAudioOutputs method and the AudioOutput property. 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 an SpVoice object and calls a subroutine called ShowAudioOutputs. This subroutine uses the GetAudioOutputs method to select all available output devices, and adds each device to the list box. The string (CURRENT) is appended to the current audio device name.

Select a device in the list box, and then click Command1. The Command1_Click procedure resets the voice's AudioOutput property to the device selected in the list box, and calls the ShowAudioOutputs subroutine, which will display the device selected as the current audio output.

Option Explicit

Private V As SpeechLib.SpVoice
Private T As SpeechLib.SpObjectToken

Private Sub Command1_Click()
    If List1.ListIndex > -1 Then
        Set V.AudioOutput = V.GetAudioOutputs().Item(List1.ListIndex)
        Call ShowAudioOutputs
    End If
End Sub

Private Sub Form_Load()
    Set V = New SpVoice
    Call ShowAudioOutputs
End Sub

Private Sub ShowAudioOutputs()
    Dim strAudio As String
    Dim strCurrentAudio As String
    
    List1.Clear
    Set T = V.AudioOutput               'Token for current audio output
    strCurrentAudio = T.GetDescription  'Get description from token

    'Show all available outputs; highlight the one in use
    
    For Each T In V.GetAudioOutputs
        strAudio = T.GetDescription     'Get description from token
        If strAudio = strCurrentAudio Then
            strAudio = strAudio & " (CURRENT)"  'Show current device
        End If
        List1.AddItem strAudio          'Add description to list box
    Next
End Sub