Question

C#如何开发语音识别，最好有例子

Answer 1

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;
}
}
}