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1. 发明申请

US20070258579A1 Multi-channel echo cancel method, multi-channel sound transfer method, stereo echo canceller, stereo sound transfer apparatus and transfer function calculation apparatus 失效
标题翻译：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
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。

2. 发明申请

US20070258578A1 Multi-channel echo cancel method, multi-channel sound transfer method, stereo echo canceller, stereo sound transfer apparatus and transfer function calculation apparatus 失效
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.

3. 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
标题翻译：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：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。

4. 发明授权

US07925008B2 Multi-channel echo cancel method, multi-channel sound transfer method, stereo echo canceller, stereo sound transfer apparatus and transfer function calculation apparatus 失效
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.

5. 发明授权

US07403609B2 Multi-channel echo cancel method, multi-channel sound transfer method, stereo echo canceller, stereo sound transfer apparatus and transfer function calculation apparatus 有权
标题翻译：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：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。

6. 发明授权

US06950513B2 Impulse response setting method for the 2-channel echo canceling filter, a two-channel echo canceller, and a two-way 2-channel voice transmission device 失效
标题翻译：用于2声道回波消除滤波器，双声道回波消除器和双向2声道语音传输装置的脉冲响应设定方法
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。

7. 发明授权

US07130428B2 Picked-up-sound recording method and apparatus 失效
标题翻译：拾音录音方法及装置
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。

8. 发明授权

US07574005B2 Howling frequency component emphasis method and apparatus 失效
标题翻译：啸叫频率分量强调方法和装置
公开(公告)号：US07574005B2
公开(公告)日：2009-08-11
申请号：US11094054
申请日：2005-03-29
申请人： Mikio Tohyama , Yoshinori Takahashi , Hiroaki Fujita , Hiraku Okumura
发明人： Mikio Tohyama , Yoshinori Takahashi , Hiroaki Fujita , Hiraku Okumura
IPC分类号： H04B3/20 , H03G5/00
CPC分类号： H03G3/32
摘要： A method is designed for emphasizing a howling frequency component of a sound signal observed in an acoustic feedback system during an observation period having a predetermined length. The method is carried out by the steps of successively sampling the sound signal from the acoustic feedback system to provide a running set of samples of the sound signal during the observation period such that a total number of the samples in the running set increments each time one or more of new sample is added to the running set until the total number of the samples corresponds to the predetermined length of the observation period, recurrently calculating a running frequency characteristic of the sound signal on a common frequency axis for the observation period from the running set of the samples each time one ore more of new sample is added to the running set, and accumulating the recurrently calculated running frequency characteristics on the common frequency axis so as to emphasize a howling frequency component contained in the sound signal.
摘要翻译：一种方法被设计用于在具有预定长度的观察期间中强调在声反馈系统中观察到的声音信号的啸叫频率分量。该方法通过以下步骤来执行：从声反馈系统连续采样声音信号，以在观察期间提供声音信号的一组运行样本，使得每次运行中的样本总数增加一个或更多的新样本被添加到运行集合中，直到样本的总数对应于观察期间的预定长度，从运行中循环计算观测期间的共同频率轴上的声音信号的运行频率特性每次将一个以上新样本添加到运行组中的样本集合，并且累积在共同频率轴上的经常计算的运行频率特性，以便强调包含在声音信号中的啸叫频率分量。

9. 发明申请

US20050220313A1 Howling frequency component emphasis method and apparatus 失效
标题翻译：啸叫频率分量强调方法和装置
公开(公告)号：US20050220313A1
公开(公告)日：2005-10-06
申请号：US11094054
申请日：2005-03-29
申请人： Mikio Tohyama , Yoshinori Takahashi , Hiroaki Fujita , Hiraku Okumura
发明人： Mikio Tohyama , Yoshinori Takahashi , Hiroaki Fujita , Hiraku Okumura
IPC分类号： H04R3/02 , G01R23/16 , G10L21/02 , H03G3/32 , H03G5/00 , H04B3/20
CPC分类号： H03G3/32
摘要： A method is designed for emphasizing a howling frequency component of a sound signal observed in an acoustic feedback system during an observation period having a predetermined length. The method is carried out by the steps of successively sampling the sound signal from the acoustic feedback system to provide a running set of samples of the sound signal during the observation period such that a total number of the samples in the running set increments each time one or more of new sample is added to the running set until the total number of the samples corresponds to the predetermined length of the observation period, recurrently calculating a running frequency characteristic of the sound signal on a common frequency axis for the observation period from the running set of the samples each time one ore more of new sample is added to the running set, and accumulating the recurrently calculated running frequency characteristics on the common frequency axis so as to emphasize a howling frequency component contained in the sound signal.
摘要翻译：一种方法被设计用于在具有预定长度的观察期间中强调在声反馈系统中观察到的声音信号的啸叫频率分量。该方法通过以下步骤来执行：从声反馈系统连续采样声音信号，以在观察期间提供声音信号的一组运行样本，使得每次运行中的样本总数增加一个或更多的新样本被添加到运行集合中，直到样本的总数对应于观察期间的预定长度，从运行中循环计算观测期间的共同频率轴上的声音信号的运行频率特性每次将一个以上新样本添加到运行组中的样本集合，并且累积在共同频率轴上的经常计算的运行频率特性，以便强调包含在声音信号中的啸叫频率分量。

10. 发明申请

US20050256705A1 Noise spectrum estimation method and apparatus 失效
标题翻译：噪声谱估计方法及装置
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。

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