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Intelligent Interface Technologies Home Page Microsoft Speech SDK

Speech Automation 5.1

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

Set: SpVoice.AudioOutput = SpObjectToken
Get: SpObjectToken = SpVoice.AudioOutput

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:

  • A command button called Command1
  • A list box called List1
  • 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


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