VC 语音聊天室出现杂音 该如何消除

Question

录音 和  发音的程序如下#include "stdafx.h"
#include "Example2_ChatRoom.h"
#include "Sound.h"
#include "Example2_ChatRoomDlg.h"
#include <fstream>#ifdef _DEBUG
#undef THIS_FILE
static char THIS_FILE[]=__FILE__;
#define new DEBUG_NEW
#endif//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////CSound::CSound()
{}CSound::~CSound()
{
waveInClose(m_hWaveIn); //关闭录音设备
waveOutClose(m_hWaveOut); //关闭录音设备
}static int i=0;//CFile file=new CFile("temp.wav");
static int j=0;
void CSound::Init(CExample2_ChatRoomDlg *dlg)
{

int result;
m_dlg=dlg;
if(waveInGetNumDevs()==0)
{
AfxMessageBox("There is no sound input device");
}
if(waveOutGetNumDevs()==0)
{
AfxMessageBox("There is no sound output device");
}
m_soundFormat.wFormatTag=WAVE_FORMAT_PCM;
m_soundFormat.nChannels=1;
m_soundFormat.nSamplesPerSec=8000;
m_soundFormat.nAvgBytesPerSec=16000;
m_soundFormat.nBlockAlign=2;
m_soundFormat.cbSize=0;
m_soundFormat.wBitsPerSample=16;     //指定录音格式 int  res=waveInOpen(&m_hWaveIn,WAVE_MAPPER, &m_soundFormat, (DWORD)m_dlg->m_hWnd,0L,CALLBACK_WINDOW); //打开录音设备
if(res!= MMSYSERR_NOERROR)
{
AfxMessageBox("Error in waveInOpen function");
return ;
}
res=waveOutOpen(&m_hWaveOut,WAVE_MAPPER, &m_soundFormat, (DWORD)m_dlg->m_hWnd,0L,CALLBACK_WINDOW); //打开录音设备
if(res!= MMSYSERR_NOERROR)
{
AfxMessageBox("Error in waveOutOpen function");
return ;
}
//in
m_pWaveHdrIn[0].lpData=m_cBufferIn;
m_pWaveHdrIn[0].dwBufferLength=MAX_BUFFER_SIZE;
m_pWaveHdrIn[0].dwBytesRecorded=0;
m_pWaveHdrIn[0].dwFlags=0;
//m_pWaveHdrIn[0].dwFlags=WHDR_BEGINLOOP; result=waveInPrepareHeader(m_hWaveIn,&m_pWaveHdrIn[0],sizeof(WAVEHDR)); //准备内存块录音
    if  (result!= MMSYSERR_NOERROR) 
    {
        AfxMessageBox(_T("Cannot InPrepareHeader !"));
        return;
    };// ::waveInUnprepareHeader(m_hWaveIn,&m_pWaveHdrIn[0],sizeof(WAVEHDR));
result=waveInAddBuffer(m_hWaveIn,&m_pWaveHdrIn[0],sizeof(WAVEHDR)); //增加内存块
    if  (result!= MMSYSERR_NOERROR) 
    {
        AfxMessageBox(_T("Cannot InAddBuffer !"));
        return;
    }; //out
m_pWaveHdrOut[0].lpData=m_cBufferOut;
m_pWaveHdrOut[0].dwBufferLength=MAX_BUFFER_SIZE;
m_pWaveHdrOut[0].dwBytesRecorded=0;
m_pWaveHdrOut[0].dwFlags=0;
//m_pWaveHdrOut[0].dwFlags=WHDR_BEGINLOOP; waveOutPrepareHeader(m_hWaveOut,&m_pWaveHdrOut[0],sizeof(WAVEHDR)); //准备内存块录音
waveOutWrite(m_hWaveOut,&m_pWaveHdrOut[0],sizeof(WAVEHDR));
}void CSound::Record()
{
waveInStart(m_hWaveIn);//开始录音
}void CSound::Play()
{
// file=m_cBufferIn;
memcpy(m_cBufferOut,m_cBufferIn,MAX_BUFFER_SIZE);
}void CSound::StopRecord()
{
waveInStop(m_hWaveIn); //停止录音
waveInReset(m_hWaveIn); //清空内存块
}void CSound::FreeRecordBuffer()
{
int result=waveInUnprepareHeader(m_hWaveIn,&m_pWaveHdrIn[i],sizeof(WAVEHDR));
i++;
if (i%3==0)
{
i=0;
}
// InBufferZero();
// Sleep(1);
    if  (result!= MMSYSERR_NOERROR) 
    {
        AfxMessageBox(_T("Cannot UnInPrepareHeader !"));
        return;
    }; //in //m_cBufferIn[MAX_BUFFER_SIZE-1]=NULL;
m_pWaveHdrIn[i].lpData=m_cBufferIn;
m_pWaveHdrIn[i].dwBufferLength=MAX_BUFFER_SIZE;
m_pWaveHdrIn[i].dwBytesRecorded=0;
m_pWaveHdrIn[i].dwFlags=0; result=waveInPrepareHeader(m_hWaveIn,&m_pWaveHdrIn[i],sizeof(WAVEHDR)); //准备内存块录音
    if  (result!= MMSYSERR_NOERROR) 
    {
        AfxMessageBox(_T("Cannot InPrepareHeader !"));
        return;
    }; //in
// ::waveInUnprepareHeader(m_hWaveIn,&m_pWaveHdrIn[0],sizeof(WAVEHDR));
result=waveInAddBuffer(m_hWaveIn,&m_pWaveHdrIn[i],sizeof(WAVEHDR)); //增加内存块
    if  (result!= MMSYSERR_NOERROR) 
    {
        AfxMessageBox(_T("Cannot InAddBuffer !"));
        return;
    }; //in

}
void CSound::FreePlayBuffer()
{// static bool once=true;
int result;

result=waveOutUnprepareHeader(m_hWaveOut,&m_pWaveHdrOut[j],sizeof(WAVEHDR));
j++;
if (j%3==0)
{
j=0;
}

m_pWaveHdrOut[j].lpData=m_cBufferOut;
m_pWaveHdrOut[j].dwBufferLength=MAX_BUFFER_SIZE;
m_pWaveHdrOut[j].dwBytesRecorded=0;
m_pWaveHdrOut[j].dwFlags=0; result=waveOutPrepareHeader(m_hWaveOut,&m_pWaveHdrOut[j],sizeof(WAVEHDR)); //准备内存块录音
    if  (result!= MMSYSERR_NOERROR) 
    {
        AfxMessageBox(_T("Cannot OutPrepareHeader !"));
        return;
    }; //out
result=waveOutWrite(m_hWaveOut,&m_pWaveHdrOut[j],sizeof(WAVEHDR)); //增加内存块
    if  (result!= MMSYSERR_NOERROR) 
    {
        AfxMessageBox(_T("Cannot OutWrite !"));
        return;
    }; //out
}
void CSound::InBufferZero()
{
int i;
for(i=0;i<MAX_BUFFER_SIZE;i++)
{
m_cBufferIn[i]=0;
}
}void CSound::OutBufferZero()
{
int i;
for(i=0;i<MAX_BUFFER_SIZE;i++)
{
m_cBufferOut[i]=0;
}
}本人菜鸟，希望大虾们帮帮我……