SpeechRecognitionEngine.SpeechDetected 事件
定义
重要
一些信息与预发行产品相关，相应产品在发行之前可能会进行重大修改。 对于此处提供的信息，Microsoft 不作任何明示或暗示的担保。
当 SpeechRecognitionEngine 检测它可以标识为语音的输入的时候引发。
public:
event EventHandler<System::Speech::Recognition::SpeechDetectedEventArgs ^> ^ SpeechDetected;public event EventHandler<System.Speech.Recognition.SpeechDetectedEventArgs> SpeechDetected;member this.SpeechDetected : EventHandler<System.Speech.Recognition.SpeechDetectedEventArgs> Public Custom Event SpeechDetected As EventHandler(Of SpeechDetectedEventArgs) Public Event SpeechDetected As EventHandler(Of SpeechDetectedEventArgs) 事件类型
示例
以下示例是控制台应用程序的一部分，用于为航班选择出发地和目的地城市。 该应用程序识别“我想从迈阿密飞往芝加哥”等短语。该示例使用 SpeechDetected 事件来报告 AudioPosition 每次检测到语音时。
using System;
using System.Speech.Recognition;
namespace SampleRecognition
{
class Program
{
static void Main(string[] args)
// Initialize an in-process speech recognition engine.
{
using (SpeechRecognitionEngine recognizer =
new SpeechRecognitionEngine())
{
// Create a grammar.
Choices cities = new Choices(new string[] {
"Los Angeles", "New York", "Chicago", "San Francisco", "Miami", "Dallas" });
GrammarBuilder gb = new GrammarBuilder();
gb.Append("I would like to fly from");
gb.Append(cities);
gb.Append("to");
gb.Append(cities);
// Create a Grammar object and load it to the recognizer.
Grammar g = new Grammar(gb);
g.Name = ("City Chooser");
recognizer.LoadGrammarAsync(g);
// Attach event handlers.
recognizer.LoadGrammarCompleted +=
new EventHandler<LoadGrammarCompletedEventArgs>(recognizer_LoadGrammarCompleted);
recognizer.SpeechDetected +=
new EventHandler<SpeechDetectedEventArgs>(recognizer_SpeechDetected);
recognizer.SpeechRecognized +=
new EventHandler<SpeechRecognizedEventArgs>(recognizer_SpeechRecognized);
// Set the input to the recognizer.
recognizer.SetInputToDefaultAudioDevice();
// Start recognition.
recognizer.RecognizeAsync();
// Keep the console window open.
Console.ReadLine();
}
}
// Handle the SpeechDetected event.
static void recognizer_SpeechDetected(object sender, SpeechDetectedEventArgs e)
{
Console.WriteLine(" Speech detected at AudioPosition = {0}", e.AudioPosition);
}
// Handle the LoadGrammarCompleted event.
static void recognizer_LoadGrammarCompleted(object sender, LoadGrammarCompletedEventArgs e)
{
Console.WriteLine("Grammar loaded: " + e.Grammar.Name);
}
// Handle the SpeechRecognized event.
static void recognizer_SpeechRecognized(object sender, SpeechRecognizedEventArgs e)
{
Console.WriteLine(" Speech recognized: " + e.Result.Text);
}
}
}
注解
每个语音识别器都有一种算法来区分沉默和语音。 SpeechRecognitionEngine执行语音识别操作时，当其算法将输入标识为语音时，它会引发 SpeechDetected 事件。 AudioPosition关联SpeechDetectedEventArgs对象的 属性指示输入流中识别器检测到语音的位置。 在SpeechRecognitionEngine引发SpeechDetected任何 、 SpeechRecognized或 SpeechRecognitionRejected 事件之前引发 SpeechHypothesized事件。
有关详细信息， Recognize请参阅 、 RecognizeAsync、 EmulateRecognize和 EmulateRecognizeAsync 方法。
创建 SpeechDetected 委托时，需要标识将处理该事件的方法。 若要将事件与事件处理程序关联，请将该委托的一个实例添加到事件中。 除非移除了该委托，否则每当发生该事件时就会调用事件处理程序。 有关事件处理程序委托的详细信息，请参阅 事件和委托。
