C#程序员干货系列之语音识别

说实话，这些年来从博客园收获了不少东西。自从当年注册以来就想平时分享点简单的小程序啥的。因为平时比较懒，突然发现近2年没更新了。准备陆续分享些小程序，这些也算是本猿手头上的一些自制小工具吧。

以后会陆续分享些WPF的自制按钮控件。

语音识别小程序，调用了windows的识别组件。精简了一些代码，算是比较简单易懂的一个语音识别类。

开发测试环境win7，VS2008。如果有其它环境中的，欢迎补充。

SRecognition.cs

using System;
using System.Speech.Recognition;
using System.Globalization;
using System.Windows.Forms;

namespace NingTao
{
  public class SRecognition
  {
    public SpeechRecognitionEngine recognizer = null;//语音识别引擎  
    public DictationGrammar dictationGrammar = null; //自然语法  
    public System.Windows.Forms.Control cDisplay; //显示控件  

    public SRecognition(string[] fg) //创建关键词语列表  
    {
      CultureInfo myCIintl = new CultureInfo("zh-CN");
      foreach (RecognizerInfo config in SpeechRecognitionEngine.InstalledRecognizers())//获取所有语音引擎  
      {
        if (config.Culture.Equals(myCIintl) && config.Id == "MS-2052-80-DESK")
        {
          recognizer = new SpeechRecognitionEngine(config);
          break;
        }//选择识别引擎
      }
      if (recognizer != null)
      {
        InitializeSpeechRecognitionEngine(fg);//初始化语音识别引擎  
        dictationGrammar = new DictationGrammar();
      }
      else
      {
        MessageBox.Show("创建语音识别失败");
      }
    }
    private void InitializeSpeechRecognitionEngine(string[] fg)
    {
      recognizer.SetInputToDefaultAudioDevice();//选择默认的音频输入设备  
      Grammar customGrammar = CreateCustomGrammar(fg);
      //根据关键字数组建立语法  
      recognizer.UnloadAllGrammars();
      recognizer.LoadGrammar(customGrammar);
      //加载语法  
      recognizer.SpeechRecognized += new EventHandler<SpeechRecognizedEventArgs>(recognizer_SpeechRecognized);
      //recognizer.SpeechHypothesized += new EventHandler <SpeechHypothesizedEventArgs>(recognizer_SpeechHypothesized);  
    }
    public void BeginRec(Control tbResult)//关联窗口控件  
    {
      TurnSpeechRecognitionOn();
      TurnDictationOn();
      cDisplay = tbResult;
    }
    public void over()//停止语音识别引擎  
    {
      TurnSpeechRecognitionOff();
    }
    public virtual Grammar CreateCustomGrammar(string[] fg) //创造自定义语法  
    {
      GrammarBuilder grammarBuilder = new GrammarBuilder();
      grammarBuilder.Append(new Choices(fg));
      return new Grammar(grammarBuilder);
    }
    private void TurnSpeechRecognitionOn()//启动语音识别函数  
    {
      if (recognizer != null)
      {
        recognizer.RecognizeAsync(RecognizeMode.Multiple);
        //识别模式为连续识别  
      }
      else
      {
        MessageBox.Show("创建语音识别失败");
      }
    }
    private void TurnSpeechRecognitionOff()//关闭语音识别函数  
    {
      if (recognizer != null)
      {
        recognizer.RecognizeAsyncStop();
        TurnDictationOff();
      }
      else
      {
        MessageBox.Show("创建语音识别失败");
      }
    }
    private void recognizer_SpeechRecognized(object sender, SpeechRecognizedEventArgs e)
    {
      //识别出结果完成的动作，通常把识别结果传给某一个控件  
      string text = e.Result.Text;
      cDisplay.Text += text;
    }
    private void TurnDictationOn()
    {
      if (recognizer != null)
      {
        recognizer.LoadGrammar(dictationGrammar);
        //加载自然语法  
      }
      else
      {
        MessageBox.Show("创建语音识别失败");
      }
    }
    private void TurnDictationOff()
    {
      if (dictationGrammar != null)
      {
        recognizer.UnloadGrammar(dictationGrammar);
        //卸载自然语法  
      }
      else
      {
        MessageBox.Show("创建语音识别失败");
      }
    }
  }
}

form调用，其中2个按钮（开始，停止），1个文本框（识别结果）

using System;
using System.Windows.Forms;

namespace NingTao
{
  public partial class Form1 : Form
  {
    private SRecognition sr;

    public Form1()
    {
      InitializeComponent();

      string[] fg = { "东方", "西方", "南方", "北方" };
      sr = new SRecognition(fg);
      button2.Enabled = false;
    }

    private void button1_Click(object sender, EventArgs e)
    {
      sr.BeginRec(textBox1);
      button1.Enabled = false;
      button2.Enabled = true;
    }

    private void button2_Click(object sender, EventArgs e)
    {
      sr.over();
      button1.Enabled = true;
      button2.Enabled = false;
    }
  }
}

然后就可以测试语音识别了。

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