语音传输如何解决杂音?

Question

传输中有很有节奏的都督声，似乎是每次发送或接收时产生的。如何解决好？

Answer 1

接收和发送是两个socket,都是双缓冲，但问题依然存在。
socket有数据到时，发送MM_WOM_OPEN消息给窗体：
void CVoiceSocket::OnReceive(int nErrorCode)
{
// TODO: 在此添加专用代码和/或调用基类
    SendMessage(hwnd,MM_WOM_OPEN,0,0);
CAsyncSocket::OnReceive(nErrorCode);
}LRESULT Voice::ON_MM_WOM_OPEN(WPARAM wParam, LPARAM lParam)
{

if(!IsVoiceOn)
return 0;
    int recvcount;
if(outfirst)
{
recvcount=m_voicerecv.Receive(Out1,5120);
waveOutUnprepareHeader(hWaveOut,&hout1,sizeof(WAVEHDR));
        hout1.dwBufferLength=recvcount;
        waveOutPrepareHeader(hWaveOut,&hout1,sizeof(WAVEHDR));
waveOutWrite(hWaveOut,&hout1,sizeof(WAVEHDR));
}
else
{
        recvcount=m_voicerecv.Receive(Out2,5120);
waveOutUnprepareHeader(hWaveOut,&hout2,sizeof(WAVEHDR));
        hout2.dwBufferLength=recvcount;
        waveOutPrepareHeader(hWaveOut,&hout2,sizeof(WAVEHDR));
waveOutWrite(hWaveOut,&hout2,sizeof(WAVEHDR));
}
outfirst=!outfirst;

return 0;
}以下是发送：
LRESULT Voice::ON_MM_WIM_DATA(WPARAM wParam, LPARAM lParam)
{
WAVEHDR* hdr=(WAVEHDR*)lParam;
char sendbuf[5120];
int sendlen=(int)hdr->dwBytesRecorded;
memcpy(sendbuf,hdr->lpData,sendlen);    if(IsVoiceOn)
{
infirst=!infirst;
    if(infirst)
waveInAddBuffer(hWaveIn,&hin1,sizeof(WAVEHDR)); 
else
    waveInAddBuffer(hWaveIn,&hin2,sizeof(WAVEHDR));
char sendbuf2[5120];
DWORD deslen=sendlen;
    if(!Coded(sendbuf,sendlen,sendbuf2,&deslen))
return 0;
 
for(int i=0;i<voicelist.GetCount();i++)
{
        m_voicesend.SendTo(sendbuf2,(int)deslen,voicelist.GetAt(i).Port,voicelist.GetAt(i).IP);
}
}

return 0;
}究竟哪里有问题呢？

Answer 2

有一个实例参考一下http://www.vckbase.com/document/viewdoc/?id=1080