公开(公告)号：US07130428B2

公开(公告)日：2006-10-31

申请号：US10025179

申请日：2001-12-19

申请人： Toru Hirai ,  Fukushi Kawakami ,  Yasushi Shimizu ,  Yoshikazu Honji ,  Masahiro Ikeda ,  Mikio Tohyama

发明人： Toru Hirai ,  Fukushi Kawakami ,  Yasushi Shimizu ,  Yoshikazu Honji ,  Masahiro Ikeda ,  Mikio Tohyama

IPC分类号： H04B3/20

CPC分类号： H04S1/002 ,  H03G3/32 ,  H03G5/22

摘要： Sound picked up by a microphone of a first sound field is reproduced by a speaker of a second sound field, and a sound picked up by a microphone of the second sound field is reproduced by the speaker of the first sound field. Sound pressure detection section detects a sound pressure of a sound present in the second (or first) sound field picked up by the microphone of the second (or first) sound field, other than a sound reproduced by the speaker of the first (or second) sound field. Other sound pressure detection section detects a sound pressure with which the sound picked up by the microphone of the second (or first) sound field and reproduced by the speaker of the first (or second) sound field is picked up by the microphone of the first (or second) sound field. Sound-pressure-difference detection section adjusts a gain of an automatic gain adjustment section in such a manner that the two detected sound pressures assume a predetermined relationship. Thus, any sound picked up in one of the first and second sound fields can be reproduced in the other sound field with an enhanced sense of unity and connection between the two sound fields.

摘要翻译： 由第一声场的麦克风拾取的声音由第二声场的扬声器再现，并且由第二声场的麦克风拾取的声音由第一声场的扬声器再现。 声压检测部检测由第二（或第一）声场的麦克风拾取的第二（或第一）声场中存在的声音的声压，而不是由第一（或第二）声音的扬声器再现的声音 ）声场。 其他声压检测部分检测由第一（或第一）声场的麦克风拾取的声音并由第一（或第二）声场的扬声器再现的声音由第一（或第二）声场的麦克风拾取的声压 （或第二）声场。 声压差检测部以这样的方式调节自动增益调整部的增益，使得两个检测到的声压呈现预定关系。 因此，在第一声场和第二声场之一中拾取的任何声音都可以在另一个声场中被再现，具有增强的两声场之间的一致性和连接感。

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

CPC分类号： H04R3/02 ,  H04M9/082

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。

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

CPC分类号： H04R3/02 ,  H04M9/082

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(公告)号：US07925006B2

公开(公告)日：2011-04-12

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

CPC分类号： H04R3/02 ,  H04M9/082

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。

公开(公告)号：US06950513B2

公开(公告)日：2005-09-27

申请号：US10141276

申请日：2002-05-08

申请人： Toru Hirai ,  Yoshikazu Honji ,  Mikio Tohyama ,  Aya Togura

发明人： Toru Hirai ,  Yoshikazu Honji ,  Mikio Tohyama ,  Aya Togura

IPC分类号： H04R3/02 ,  H04B3/23 ,  H04M9/08 ,  H04M1/00 ,  H04M9/00

CPC分类号： H04M9/082

摘要： Two signals, which are mutually correlated, are subjected to a principal component analysis and converted into two signals being put in an orthogonal relation, thereby generating two signals being non-correlated. Those two signals are reproduced by speakers, and the voice generated from the speakers are collected by microphones. The cross spectra of a signal as the result of subtracting an echo canceling signal from a voice collected by each microphone, and a voice before it is generated from the speaker, are obtained. Those cross spectra are ensemble-averaged for a predetermined period of time, and inverse Fourier transformed, thereby producing impulse response estimation errors of each filter. Impulse responses of those filters are updated so as to cancel those impulse response estimation errors.

摘要翻译： 相互相关的两个信号经受主分量分析，并转换成两个正交关系的信号，从而产生两个不相关的信号。 这两个信号由扬声器再现，并且由扬声器产生的声音由麦克风收集。 从扬声器产生作为从每个麦克风收集的语音中减去回声消除信号和从其发出的声音的信号的交叉频谱。 这些交叉频谱在预定时间段内进行整体平均，并进行傅立叶逆变换，从而产生每个滤波器的脉冲响应估计误差。 这些滤波器的脉冲响应被更新，以便消除这些脉冲响应估计误差。

公开(公告)号：US07925008B2

公开(公告)日：2011-04-12

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

CPC分类号： H04R3/02 ,  H04M9/082

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(公告)号：US07403609B2

公开(公告)日：2008-07-22

申请号：US10705794

申请日：2003-11-07

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

CPC分类号： H04R3/02 ,  H04M9/082

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。

公开(公告)号：US20050256705A1

公开(公告)日：2005-11-17

申请号：US11093672

申请日：2005-03-29

申请人： Michiko Kazama ,  Mikio Tohyama ,  Toru Hirai

发明人： Michiko Kazama ,  Mikio Tohyama ,  Toru Hirai

IPC分类号： G10L15/20 ,  G01R23/16 ,  G01R29/26 ,  G10L11/00 ,  G10L21/02 ,  H04B1/10

CPC分类号： G10L21/0208

摘要： A method is provided for recurrently estimating a spectrum of noise at each signal observation interval from a sound signal which contains the noise and which is observed at each signal observation interval. In the method, there are acquired an envelope of a previous spectrum of the noise which has been previously estimated from the sound signal observed at a previous signal observation interval, and an envelope of a current spectrum of the sound signal which is observed at a current signal observation interval subsequent to the previous signal observation interval. Then, a value of correlation is computed between the envelop of the previous spectrum of the noise and the envelope of the current spectrum of the sound signal. A current spectrum of the noise contained in the sound signal observed at the current signal observation interval is estimated in accordance with the computed value of the correlation and based on the previous spectrum of the noise and the current spectrum of the sound signal.

摘要翻译： 提供了一种从包含噪声的声音信号在每个信号观测间隔周期性地估计噪声频谱的方法，并且在每个信号观测间隔处观察到噪声频谱。 在该方法中，获取先前根据在先前的信号观察间隔观察到的声音信号估计出的噪声的先前频谱的包络，以及在当前观察到的声音信号的当前频谱的包络 在先前的信号观察间隔之后的信号观察间隔。 然后，在噪声的先前频谱的包络和声音信号的当前频谱的包络之间计算相关值。 根据相关的计算值，并根据噪声的前一频谱和声音信号的当前频谱，估计在当前信号观测间隔处观察到的声音信号中包含的噪声的当前频谱。

公开(公告)号：US07596495B2

公开(公告)日：2009-09-29

申请号：US11093672

申请日：2005-03-29

申请人： Michiko Kazama ,  Mikio Tohyama ,  Toru Hirai

发明人： Michiko Kazama ,  Mikio Tohyama ,  Toru Hirai

IPC分类号： G10L21/02 ,  G10L19/02

CPC分类号： G10L21/0208

摘要： A method is provided for recurrently estimating a spectrum of noise at each signal observation interval from a sound signal which contains the noise and which is observed at each signal observation interval. In the method, there are acquired an envelope of a previous spectrum of the noise which has been previously estimated from the sound signal observed at a previous signal observation interval, and an envelope of a current spectrum of the sound signal which is observed at a current signal observation interval subsequent to the previous signal observation interval. Then, a value of correlation is computed between the envelop of the previous spectrum of the noise and the envelope of the current spectrum of the sound signal. A current spectrum of the noise contained in the sound signal observed at the current signal observation interval is estimated in accordance with the computed value of the correlation and based on the previous spectrum of the noise and the current spectrum of the sound signal.

摘要翻译： 提供了一种从包含噪声的声音信号在每个信号观测间隔周期性地估计噪声频谱的方法，并且在每个信号观测间隔处观察到噪声频谱。 在该方法中，获取先前根据在先前的信号观察间隔观察到的声音信号估计出的噪声的先前频谱的包络，以及在当前观察到的声音信号的当前频谱的包络 在先前的信号观察间隔之后的信号观察间隔。 然后，在噪声的先前频谱的包络和声音信号的当前频谱的包络之间计算相关值。 根据相关的计算值，并根据噪声的前一频谱和声音信号的当前频谱，估计在当前信号观测间隔处观察到的声音信号中包含的噪声的当前频谱。

公开(公告)号：US08428272B2

公开(公告)日：2013-04-23

申请号：US12708751

申请日：2010-02-19

申请人： Mikio Tohyama ,  Mai Koike ,  Yasushi Shimizu

发明人： Mikio Tohyama ,  Mai Koike ,  Yasushi Shimizu

IPC分类号： H04R3/02

CPC分类号： G10K11/175 ,  H04K1/02 ,  H04K1/04 ,  H04K1/06 ,  H04K3/43 ,  H04K3/46 ,  H04K3/825 ,  H04K2203/12

摘要： In a masking sound generating apparatus, a band divider divides a target sound signal into a plurality of frequency bands to generate a plurality of band signals. An envelope signal generating part generates a plurality of envelope signals representing respective envelopes of the plurality of the band signals. A signal converter segments each of the plurality of the envelope signals into a plurality of frames, then specifies frames of segmented envelope signals which have an amplitude greater than a first threshold and less than a second threshold, and changes an order of the specified frames in an arrangement of the plurality of the frames. A multiplier multiplies each of the plurality of the envelope signals by a noise signal, each envelope signal having the order of the frames changed by the signal converter, and outputs the plurality of the envelope signals multiplied by the noise signal as individual band masking signals. An adder adds the individual band masking signals to output a masking sound signal capable of masking the target sound signal.

摘要翻译： 在掩蔽声产生装置中，分频器将目标声音信号分割为多个频带，以产生多个频带信号。 包络信号生成部生成表示多个频带信号的各个信封的多个包络信号。 信号转换器将多个包络信号中的每一个分成多个帧，然后指定具有大于第一阈值且小于第二阈值的幅度的分段包络信号的帧，并且改变指定帧的顺序 多个框架的布置。 乘法器将多个包络信号中的每一个乘以噪声信号，每个包络信号具有由信号转换器改变的帧的顺序，并将乘以噪声信号的多个包络信号作为单独的带屏蔽信号输出。 加法器将各个带屏蔽信号相加以输出能够掩蔽目标声音信号的掩蔽声音信号。