c# - SpeechRecognition 将背景噪音识别为语音

Question

我在我的程序中使用 MSDN 的 SpeechRecognitionEngine。问题在于它将背景噪音识别为语音。

例如，如果我打响指、轻敲 table 或移动我的椅子，它就会将其识别为语音。

为什么它会将背景噪音识别为语音。

我打响指的声音和我说“记事本”的声音不一样!!!

这是代码

using System;
using System.Threading;
using System.Speech;
using System.Speech.Synthesis;
using System.Speech.Recognition;

namespace SpeachTest
{
    public class MainClass
    {
        static void Main()
        {
        MainClass main = new MainClass(); 
        SpeechRecognitionEngine sre = new SpeechRecognitionEngine(new System.Globalization.CultureInfo("en-US"));
            Choices choiceList = new Choices();
            choiceList.Add(new string[]{"Open", "Close", "Then", "Volume", "Up", "Firefox", "Notepad", "Steam","turn", "the", "now" } );

            GrammarBuilder builder = new GrammarBuilder();
            builder.Append(choiceList);
            Grammar grammar = new Grammar(new GrammarBuilder(builder,0, 10) );

            sre.SpeechRecognized += main.sreRecognizedEvent;
            sre.SpeechDetected += main.sreDetectEvent;
            sre.SpeechRecognitionRejected += main.sreRejectEvent;
            sre.RecognizeCompleted += main.sreCompleteEvent;

            sre.InitialSilenceTimeout = TimeSpan.FromSeconds(0);
            sre.BabbleTimeout = TimeSpan.FromSeconds(0);
            sre.EndSilenceTimeout = TimeSpan.FromSeconds(0);
            sre.EndSilenceTimeoutAmbiguous = TimeSpan.FromSeconds(0);


            sre.SetInputToDefaultAudioDevice();
            sre.LoadGrammar(grammar);

            while(true){
            sre.Recognize();
            }
        }


        void sreRecognizedEvent(Object sender, SpeechRecognizedEventArgs e){
        Console.Write("Reconized ~ " + e.Result.Text + " ~ with confidence " + e.Result.Confidence);
        Console.WriteLine();
        }


        void sreDetectEvent(Object sender, SpeechDetectedEventArgs e){
        Console.WriteLine("Detected some type of input");
        }

        void sreRejectEvent(Object sender,  SpeechRecognitionRejectedEventArgs e){
        Console.WriteLine("Rejected Input ~ " + e.Result.Text) ;
        }

        void sreCompleteEvent(Object sender, System.Speech.Recognition.RecognizeCompletedEventArgs e){
        Console.WriteLine("Completed Recongnization");
        }
}

}

Answer 1

避免任何过滤算法，您可以检查 Confidence您当前显示的属性。它介于 0.0 和 1.0 之间，其中 1 非常有信心。我发现 0.7 效果很好，但您可以反复试验。

void sreRecognizedEvent(Object sender, SpeechRecognizedEventArgs e)
{
    if(e.Result.Confidence >= 0.7)
    {
        Console.Write("Reconized ~ " + e.Result.Text + " ~ with confidence " + e.Result.Confidence);
        Console.WriteLine();
    }        
}