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riconoscimento vocale tramite System.Speech.Recognition

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Imports System.Speech.Recognition


Public Class Form1
    Dim recognizer As New SpeechRecognitionEngine
   


    Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
  
      recognizer.SetInputToDefaultAudioDevice()

 

quando arriva a questa riga ricevo il messaggio di errore

Eccezione generata: 'System.Runtime.InteropServices.COMException' in System.Speech.dll


non so come rimediare.....



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