How do you use the .NET speech namespace classes to convert audio in a WAV file to textual form which I can display on the screen or save to file?
I am looking for some tutorial samples.
UPDATE
Found a code sample here. But when I tried it it gives incorrect results. Below is the vb code sample I've adopted. (Actually I don't mind the lang as long as its either vb/c#...). It is not giving me proper results. I assume if we put the right grammar - i.e. the words we expect in the recording - we should get the textual output of that. First I've tried with sample words that are in the call. It sometimes printed only that (one) word and nothing else. Then I tried words which we totally do not expect in the recording...Unfortunately it printed out that too... :(
Imports System
Imports System.Speech.Recognition
Public Class Form1
Dim WithEvents sre As SpeechRecognitionEngine
Private Sub btnLiterate_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnLiterate.Click
If TextBox1.Text.Trim.Length = 0 Then Exit Sub
sre.SetInputToWaveFile(TextBox1.Text)
Dim r As RecognitionResult
r = sre.Recognize()
If r Is Nothing Then
TextBox2.Text = "Could not fetch result"
Return
End If
TextBox2.Text = r.Text
End Sub
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
TextBox1.Text = String.Empty
Dim dr As DialogResult
dr = OpenFileDialog1.ShowDialog()
If dr = Windows.Forms.DialogResult.OK Then
If Not OpenFileDialog1.FileName.Contains("wav") Then
MessageBox.Show("Incorrect file")
Else
TextBox1.Text = OpenFileDialog1.FileName
End If
End If
End Sub
Public Sub New()
' This call is required by the Windows Form Designer.
InitializeComponent()
sre = New SpeechRecognitionEngine()
End Sub
Private Sub sre_LoadGrammarCompleted(ByVal sender As Object, ByVal e As System.Speech.Recognition.LoadGrammarCompletedEventArgs) Handles sre.LoadGrammarCompleted
End Sub
Private Sub sre_SpeechHypothesized(ByVal sender As Object, ByVal e As System.Speech.Recognition.SpeechHypothesizedEventArgs) Handles sre.SpeechHypothesized
System.Diagnostics.Debug.Print(e.Result.Text)
End Sub
Private Sub sre_SpeechRecognitionRejected(ByVal sender As Object, ByVal e As System.Speech.Recognition.SpeechRecognitionRejectedEventArgs) Handles sre.SpeechRecognitionRejected
System.Diagnostics.Debug.Print("Rejected: " & e.Result.Text)
End Sub
Private Sub sre_SpeechRecognized(ByVal sender As Object, ByVal e As System.Speech.Recognition.SpeechRecognizedEventArgs) Handles sre.SpeechRecognized
System.Diagnostics.Debug.Print(e.Result.Text)
End Sub
Private Sub Form1_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
Dim words As String() = New String() {"triskaidekaphobia"}
Dim c As New Choices(words)
Dim grmb As New GrammarBuilder(c)
Dim grm As Grammar = New Grammar(grmb)
sre.LoadGrammar(grm)
End Sub
End Class
UPDATE(after Nov 28th)
Found a way to load a default grammar. It goes something like this:
sre.LoadGrammar(New DictationGrammar)
There are still problems here. The recognition is not exact. The output is rubbish. For a 6min file it gives probably 5-6 words of text totally irrelevant to the voice file.