Speech SDK 5.1을 이용한 음성인식 프로그램

다음주에 있는 청소년 과학관 행사를 위해 음성인식을 통해서 로봇을 제어하는 것을 구현하고 있는데,
Speech SDK 5.1과 C#을 이용하였습니다.

간단하게 구현이 가능해서 테스트를 해보는데 windows XP 버전에서는 동작을 안하고, windows7에서는
동작이 잘되어서 왜그런가 구글신께 여쭤보았더니, 역시나 꽤나 이슈가 되고 있는 문제였습니다.

음성인식을 하려고 windows7으로 업그레이드를 해야하나.. 고민입니다.

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

using System.Threading;

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

namespace VoiceRecognition
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        //speech
        SpeechSynthesizer synthesizer = new SpeechSynthesizer();
        //create the recognition engine
        SpeechRecognitionEngine sre = new SpeechRecognitionEngine();
        //create a new GrammerBuilder to specify which commands we want to use
        GrammarBuilder grammarBuilder = new GrammarBuilder();

        private void button1_Click(object sender, EventArgs e)
        {

            //append all the choice we want for commands.
            //we want to be able to one, two, three..it's only test..
            grammarBuilder.Append(new Choices("one", "two", "three"));

            //create the Grammar from the grammarBuilder
            Grammar customGrammar = new Grammar(grammarBuilder);

            //unload any grammars from the recognition engine
            sre.UnloadAllGrammars();

            //load out new grammar
            sre.LoadGrammar(customGrammar);

            Thread t1 = new Thread(delegate()
            {
                //set our recognition engine to use the default audio device
                sre.SetInputToDefaultAudioDevice();
                sre.RecognizeAsync(RecognizeMode.Multiple);
            });

            t1.Start();

            //add an event handler so we get events whenever the engine recognizes spoken commands
            sre.SpeechRecognized += new EventHandler<SpeechRecognizedEventArgs>(sre_SpeechRecognized);

            //set the recognition engine to keep running after recognition a command.
            //if we had used RecognizeMode.single, the engine would quite listening after
            //the first recognized command.

            //sre.RecognizeAsync(RecognizeMode.Multiple);
        }

        void sre_SpeechRecognized(object sender, SpeechRecognizedEventArgs e)
        {
            //simple check to see what the result of the recognition was
            switch (e.Result.Text)
            {
                //check for the count
                //we have to make sure we aren't in checking mode first.

                case "one":
                    textBox1.Text = "one";
                    break;

                case "two":
                    textBox1.Text = "two";
                    break;

                case "three":
                    textBox1.Text = "three";
                    break;
            }
        }

구현하는 부분은 그렇게 어렵지 않은데, 문제는 마이크에 대한 응답속도가 생각보다 느리고,
잡음에 강인하지 않으며, windows vista이상에서 원활이 작동한다는 것입니다.