SpeechRecognitionEngine.InitialSilenceTimeout 屬性
定義
重要
部分資訊涉及發行前產品，在發行之前可能會有大幅修改。 Microsoft 對此處提供的資訊，不做任何明確或隱含的瑕疵擔保。
取得或設定完成辨識前 SpeechRecognitionEngine 接受只包含靜音之輸入的時間間隔。
public:
property TimeSpan InitialSilenceTimeout { TimeSpan get(); void set(TimeSpan value); };public TimeSpan InitialSilenceTimeout { get; set; }member this.InitialSilenceTimeout : TimeSpan with get, setPublic Property InitialSilenceTimeout As TimeSpan屬性值
無回應間隔的持續時間。
例外狀況
這個屬性設定為小於 0 秒。
範例
下列範例顯示示範基本語音辨識的主控台應用程式的一部分。 此範例會在 BabbleTimeout 起始語音辨識之前，先設定 的 SpeechRecognitionEngine 和 InitialSilenceTimeout 屬性。 語音辨識器的 AudioStateChanged 處理常式和 RecognizeCompleted 事件輸出事件資訊至主控台，以示範屬性的屬性 SpeechRecognitionEngine 如何影響 InitialSilenceTimeout 辨識作業。
using System;
using System.Speech.Recognition;
namespace SpeechRecognitionApp
{
class Program
{
static void Main(string[] args)
{
// Initialize an in-process speech recognizer.
using (SpeechRecognitionEngine recognizer =
new SpeechRecognitionEngine(
new System.Globalization.CultureInfo("en-US")))
{
// Load a Grammar object.
recognizer.LoadGrammar(CreateServicesGrammar("FindServices"));
// Add event handlers.
recognizer.AudioStateChanged +=
new EventHandler<AudioStateChangedEventArgs>(
AudioStateChangedHandler);
recognizer.RecognizeCompleted +=
new EventHandler<RecognizeCompletedEventArgs>(
RecognizeCompletedHandler);
// Configure input to the speech recognizer.
recognizer.SetInputToDefaultAudioDevice();
recognizer.InitialSilenceTimeout = TimeSpan.FromSeconds(3);
recognizer.BabbleTimeout = TimeSpan.FromSeconds(2);
recognizer.EndSilenceTimeout = TimeSpan.FromSeconds(1);
recognizer.EndSilenceTimeoutAmbiguous = TimeSpan.FromSeconds(1.5);
Console.WriteLine("BabbleTimeout: {0}", recognizer.BabbleTimeout);
Console.WriteLine("InitialSilenceTimeout: {0}", recognizer.InitialSilenceTimeout);
Console.WriteLine("EndSilenceTimeout: {0}", recognizer.EndSilenceTimeout);
Console.WriteLine("EndSilenceTimeoutAmbiguous: {0}", recognizer.EndSilenceTimeoutAmbiguous);
Console.WriteLine();
// Start asynchronous speech recognition.
recognizer.RecognizeAsync(RecognizeMode.Single);
// Keep the console window open.
while (true)
{
Console.ReadLine();
}
}
}
// Create a grammar and build it into a Grammar object.
static Grammar CreateServicesGrammar(string grammarName)
{
// Create a grammar for finding services in different cities.
Choices services = new Choices(new string[] { "restaurants", "hotels", "gas stations" });
Choices cities = new Choices(new string[] { "Seattle", "Boston", "Dallas" });
GrammarBuilder findServices = new GrammarBuilder("Find");
findServices.Append(services);
findServices.Append("near");
findServices.Append(cities);
// Create a Grammar object from the GrammarBuilder.
Grammar servicesGrammar = new Grammar(findServices);
servicesGrammar.Name = ("FindServices");
return servicesGrammar;
}
// Handle the AudioStateChanged event.
static void AudioStateChangedHandler(
object sender, AudioStateChangedEventArgs e)
{
Console.WriteLine("AudioStateChanged ({0}): {1}",
DateTime.Now.ToString("mm:ss.f"), e.AudioState);
}
// Handle the RecognizeCompleted event.
static void RecognizeCompletedHandler(
object sender, RecognizeCompletedEventArgs e)
{
Console.WriteLine("RecognizeCompleted ({0}):",
DateTime.Now.ToString("mm:ss.f"));
string resultText;
if (e.Result != null) { resultText = e.Result.Text; }
else { resultText = "<null>"; }
Console.WriteLine(
" BabbleTimeout: {0}; InitialSilenceTimeout: {1}; Result text: {2}",
e.BabbleTimeout, e.InitialSilenceTimeout, resultText);
if (e.Error != null)
{
Console.WriteLine(" Exception message: ", e.Error.Message);
}
// Start the next asynchronous recognition operation.
((SpeechRecognitionEngine)sender).RecognizeAsync(RecognizeMode.Single);
}
}
}
備註
每個語音辨識器都有一個演算法，可區分無聲和語音。 如果辨識器輸入在初始無回應逾時期間為無聲，則辨識器會完成該辨識作業。
針對非同步辨識作業和模擬，辨識器會 RecognizeCompleted 引發 事件，其中 RecognizeCompletedEventArgs.InitialSilenceTimeout 屬性為
true，而 RecognizeCompletedEventArgs.Result 屬性為null。針對同步辨識作業和模擬，辨識器會
null傳回 ，而不是有效的 RecognitionResult 。
如果初始無聲逾時間隔設定為 0，辨識器不會執行初始無聲逾時檢查。 逾時間隔可以是任何非負值。 預設值為 0 秒。
