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21.发明申请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公开(公告)号：US20070258579A1
公开(公告)日：2007-11-08
申请号：US11825301
申请日：2007-07-05
申请人： Toru Hirai , Mikio Tohyama , Hiraku Okumura , Yoshikazu Honji , Hiroshi Iriyama , Koji Niimi
发明人： Toru Hirai , Mikio Tohyama , Hiraku Okumura , Yoshikazu Honji , Hiroshi Iriyama , Koji Niimi
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.
摘要翻译： 立体声信号直接从扬声器（SP（L），SP（R））再现。 通过使用立体声信号的和信号和差分信号作为参考信号，并且根据具有麦克风收集的声音信号的参考信号的交叉频谱计算，执行计算以获得四个声音传送系统的传递函数 扬声器（SP（L），SP（R））和麦克风（MC（L），MC（R））之间。 所获得的传递函数进行傅里叶逆变换以获得脉冲响应，其被设置在滤波器装置（40-1至40-4）中以产生回波消除信号并执行回波消除。 这解决了多声道声音信号的回波消除技术中不确定系数的问题。
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公开(公告)号：US20070258578A1
公开(公告)日：2007-11-08
申请号：US11825270
申请日：2007-07-05
申请人： Toru Hirai , Mikio Tohyama , Hiraku Okumura , Yoshikazu Honji , Hiroshi Iriyama , Koji Niimi
发明人： Toru Hirai , Mikio Tohyama , Hiraku Okumura , Yoshikazu Honji , Hiroshi Iriyama , Koji Niimi
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.
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公开(公告)号：US20050213776A1
公开(公告)日：2005-09-29
申请号：US11074569
申请日：2005-03-08
申请人： Yoshikazu Honji , Tetsu Kobayashi , Takashi Kunii
发明人： Yoshikazu Honji , Tetsu Kobayashi , Takashi Kunii
摘要： Noises in an interior of an automobile are estimated based on sensed values of sensors that sense a speed (driving speed), an accelerator opening angle, and an engine speed respectively. This estimation is carried out by searching a noise estimation database. A masking characteristic of an audio signal is deduced based on the estimated noises. An equalizing characteristic to prevent a masking of the audio signal is decided based on the masking characteristic, and then the audio signal is equalized.
摘要翻译： 基于检测速度（行驶速度），加速器开度和发动机速度的传感器的感测值来估计汽车内部的噪音。 通过搜索噪声估计数据库来进行该估计。 基于估计的噪声推导出音频信号的掩蔽特性。 基于掩蔽特性决定防止音频信号的屏蔽的均衡特性，然后音频信号相等。
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