发明授权
US07925006B2 Multi-channel echo cancel method, multi-channel sound transfer method, stereo echo canceller, stereo sound transfer apparatus and transfer function calculation apparatus
失效
多声道回声消除法，多声道声音传输法，立体声回波消除器，立体声传输装置及传递函数计算装置
- 专利标题： Multi-channel echo cancel method, multi-channel sound transfer method, stereo echo canceller, stereo sound transfer apparatus and transfer function calculation apparatus
- 专利标题（中）： 多声道回声消除法，多声道声音传输法，立体声回波消除器，立体声传输装置及传递函数计算装置
-
申请号： US11825270申请日： 2007-07-05
-
公开(公告)号： US07925006B2公开(公告)日： 2011-04-12
- 发明人: Toru Hirai , Mikio Tohyama , Hiraku Okumura , Yoshikazu Honji , Hiroshi Iriyama , Koji Niimi
- 申请人： Toru Hirai , Mikio Tohyama , Hiraku Okumura , Yoshikazu Honji , Hiroshi Iriyama , Koji Niimi
- 申请人地址： JP Hamamatsu-shi
- 专利权人： Yamaha Corporation
- 当前专利权人： Yamaha Corporation
- 当前专利权人地址： JP Hamamatsu-shi
- 代理机构： Pillsbury Winthrop Shaw Pittman LLP
- 主分类号： H04M9/08
- IPC分类号： H04M9/08
摘要：
Stereo sound signals are reproduced directly from loudspeakers (SP(L), SP(R)). By using a sum signal and a difference signal of the stereo sound signals as a reference signal, and according to a cross spectrum calculation of the reference signal with a microphone-collected sound signal, calculation is performed to obtain transfer functions of four sound transfer systems between the loudspeakers (SP(L), SP(R)) and microphones (MC(L), MC(R)). The transfer functions obtained are subjected to inverse Fourier transform to obtain impulse responses, which are set in filter means (40-1 to 40-4) to create echo cancel signals and perform echo canceling. This solves the problem of an indefinite coefficient in the echo cancel technique of a multi-channel sound signal.
公开/授权文献
信息查询
