深海小魚's Blog

2013-12-07

[Windows Phone]Speech Recognizer介紹

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  • 2014-01-22

[Windows Phone]Speech Recognizer介紹

 

這邊將介紹不使用SpeechRecognizerUI 的Speech Recognizer。簡單說就是沒有使用系統提供的GUI介面，來進行語音辨識的功能。

 

在功能列須打開

「ID_CAP_MICROPHONE」

「ID_CAP_NETWORKING」

「ID_CAP_SPEECH_RECOGNITION」

 

1.在 Mainpage.xaml新增TextBlock及Button。

   1: <Grid x:Name="ContentPanel" Grid.Row="1" Margin="12,0,12,0">
   2:     <StackPanel Orientation="Vertical">
   3:         <TextBlock x:Name="textblock" Text="" FontSize="30" HorizontalAlignment="Center"/>
   4:         <Button x:Name="button" Click="button_Click" Content="speaker" />
   5:     </StackPanel>
   6: </Grid>

 

 

 

2.到cs裡宣告全域變數，讓button事件可以使用。

之後到MainPage裡，初始化Recognizer、設定Grammars及註冊AudioCaptureStateChanged事件。

   1: public MainPage()
   2: {
   3:    InitializeComponent();
   4:    Recognizer = new SpeechRecognizer();//初始化
   5:    Recognizer.Grammars.AddGrammarFromPredefinedType("Search",SpeechPredefinedGrammar.WebSearch);//設定WebSearch的Grammar
   6:    Recognizer.AudioCaptureStateChanged += Recognizer_AudioCaptureStateChanged;
   7:        }

這裡的Grammars使用系統預設的Type，而辨識來源由Web提供，

 

 

3.系統會產生Recognizer_AudioCaptureStateChanged事件，裡面要處理辨識的狀態。

   1: if (args.State == SpeechRecognizerAudioCaptureState.Capturing)
   2: {
   3:     this.Dispatcher.BeginInvoke(delegate { textblock.Text = "Listening"; });
   4: }
   5:  else if (args.State == SpeechRecognizerAudioCaptureState.Inactive)
   6:  {
   7:      this.Dispatcher.BeginInvoke(delegate { textblock.Text = "Thinking"; });
   8:  }

若Recognizer正在等待音訊輸入時，Textblock顯示「Listening」，若擷取完畢則顯示「Thniking」。

 

 

4.到Button事件裡處理語音辨識

   1: private async void button_Click(object sender, RoutedEventArgs e)
   2: {
   3:     SpeechRecognitionResult recoResult = await Recognizer.RecognizeAsync();//開啟識別
   4:     // 確認識別的結果是否與片語相符
   5:     if (recoResult.TextConfidence == SpeechRecognitionConfidence.Rejected)
   6:     {
   7:         textblock.Text = "sorry,didn't catch that.\n\n say again.";
   8:     }
   9:     //若太小聲則請使用者在說一次
  10:     else if (recoResult.TextConfidence == SpeechRecognitionConfidence.Low)
  11:     {
  12:         textblock.Text = "not sure what you said.\n\nSay again";
  13:     }
  14:     //若精確度在等級低之上，則輸出使用者所說的話
  15:     else if (recoResult.TextConfidence == SpeechRecognitionConfidence.Medium ||
  16:         recoResult.TextConfidence == SpeechRecognitionConfidence.High)
  17:     {
  18:         textblock.Text = "Heard you say: \n\n" + recoResult.Text;
  19:     }
  20: }

 

Reference

Windows Phone 8 – SpeechRecognizer

Starting speech recognition for Windows Phone 8

 

 

 

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