回声抑制器:AEC回声抑制算法
疯狂代码 http://www.crazycoder.cn/ ĵ:http:/www.crazycoder.cn/Arithmetic/Article31436.html
AEC回声抑制算法这个比较难目前可以使用directsound进行处理不过只能在xp下使用别系统不支持！目前
gips对本算法有出色实现skype就是使用该引擎！要想自己实现恐怕很困难！
AEC 模块是 Microsoft DirectSound 底层结构部分该组件包括下列特性和限制:
AEC只在不超过 25×15×9 英尺小房间才会有效； AEC只对单声道有效当输出是多个通道立体声时候只有个通
道能够具有回波抵消效果； AEC不能抵消来自其它声音源声音比如背景中收音机放出来歌曲；
IDirectSoundFullDuplex8* DirectSoundFD;// IDirectSoundCaptureBuffer8*
DirectSoundCaptureBuf8;//捕捉缓冲区接口指针 IDirectSoundBuffer8* DirectSoundBuf8;//回放缓冲区接
口指针 IDirectSoundBuffer8* pIUnkown;//回放缓冲区接口指针
extern "C" const GUID IID_IDirectSoundBuffer8 = {0x6825a449, 0x7524, 0x4d82,{ 0x92, 0x0f, 0x50,
0xe3, 0x6a, 0xb3, 0xab, 0x1e}}; extern "C" const GUID GUID_DSCFX_MS_NS = {0x11c5c73b, 0x66e9,
0x4ba1, {0xa0, 0xba, 0xe8, 0x14, 0xc6, 0xee, 0xd9, 0x2d}}; extern "C" const GUID
GUID_DSCFX_CLASS_NS = {0xe07f903f, 0x62fd, 0x4e60, {0x8c, 0xdd, 0xde, 0xa7, 0x23, 0x66, 0x65,
0xb5}}; extern "C" const GUID GUID_DSCFX_MS_AEC = {0xcdebb919, 0x379a, 0x488a, {0x87, 0x65,
0xf5, 0x3c, 0xfd, 0x36, 0xde, 0x40}}; extern "C" const GUID GUID_DSCFX_CLASS_AEC = {0xBF963D80L,
0xC559, 0x11D0, {0x8A, 0x2B, 0x00, 0xA0, 0xC9, 0x25, 0x5A, 0xC1}}; extern "C" const GUID DAlgorithm
={0x00000000, 0x0000, 0x0000, {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}};
//1.创建及化DirectSound WAVEFORMATEX WaveDataFormat={WAVE_FORMAT_PCM,
1,8000,16000,2,16, 0}; //回放缓冲区render buffer DSBUFFERDESC desc; mem(&desc, 0, (desc));
desc.dwSize = (desc); desc.dwFlags = DSBCAPS_CTRLFX | DSBCAPS_GLOBALFOCUS;
desc.dwBufferBytes = 2000 * NUM_REC_NOTIFICATIONS;//待定 desc.dwReserved = 0;
desc.lpwfxFormat = &WaveDataFormat;
//捕捉缓冲区AEC和NS效果 DSCEFFECTDESC efft[2]; mem(efft, 0, (efft)); //AEC效果 efft[0].dwSize =
(efft[0]); efft[0].dwFlags = DSCFX_LOCSOFTWARE; efft[0].guidDSCFXClass = GUID_DSCFX_CLASS_AEC;
efft[0].guidDSCFXInstance = GUID_DSCFX_MS_AEC; //NS效果 efft[1].dwSize = (efft[1]); efft[1].dwFlags
= DSCFX_LOCSOFTWARE; efft[1].guidDSCFXClass = GUID_DSCFX_CLASS_NS;
efft[1].guidDSCFXInstance = GUID_DSCFX_MS_NS; //捕捉缓冲区capture buffer DSCBUFFERDESC cdesc;
mem(&cdesc, 0, (cdesc)); cdesc.dwSize = (cdesc); cdesc.dwFlags = DSCBCAPS_CTRLFX;
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