C＃中：录制WAV文件为文本（语音到文本）与System.Speech命名空间 [英] C#: transcribe WAV file to text (speech-to-text) with System.Speech namespaces

问题描述

你如何使用.NET讲话命名空间的类音频转换在 WAV 文件，以文本的形式，我可以显示在屏幕上或保存到文件？

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?

我要寻找一些教程样本。

I am looking for some tutorial samples.

找到一个代码示例的这里。但是，当我尝试了它给不正确的结果。下面是我通过VB代码示例。 （其实我不只要介意郎作为其无论是VB / C＃...）。它不给我正确的结果。我认为，如果我们把正确的语法 - 即我们在记录期望的话 - 我们应该得到的文本输出。首先，我已经试过与在呼叫样的话。有时候只印了（一个）字，没有别的。然后我尝试这是我们完全的记录不希望的话...不幸的是打印出来的太...：（

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

更新（11月28日以后）

找到了一种方法来加载默认的语法。它是这样的：

UPDATE(after Nov 28th)

Found a way to load a default grammar. It goes something like this:

sre.LoadGrammar(New DictationGrammar)

还有问题在这里。识别不准确。输出是垃圾。对于一个6分钟的文件它给了大概5-6文本完全无关的语音文件的话。

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.

推荐答案

在系统中的类。语音是文本到语音（主要是一个acessibility功能）。

The classes in System.Speech are for text to speech (primarily an acessibility feature).

您正在寻找语音识别。还有，因为 System.Speech.Recognition 命名空间中可用.NET 3.0。它采用了Windows桌面语音引擎。这可能让你开始，但我想有更好的引擎在那里。

You are looking for voice recognition. There is the System.Speech.Recognition namespace available since .Net 3.0. It uses the Windows Desktop Speech engine. This might get you started, but I guess there are better engines out there.

语音识别是非常复杂的，很难做对，也有一些可用的商业产品。

Voice recognition is very complicated and hard to do right, there are also some commercial products available.

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