公开(公告)号：US20070076896A1

公开(公告)日：2007-04-05

申请号：US11501332

申请日：2006-08-07

申请人： Rika Hosaka ,  Akihiko Enamito ,  Kenji Kojima ,  Shinya Kijimoto

发明人： Rika Hosaka ,  Akihiko Enamito ,  Kenji Kojima ,  Shinya Kijimoto

IPC分类号： A61F11/06 ,  G10K11/16 ,  H03B29/00

CPC分类号： G10K11/178 ,  G10K2210/3028

摘要： Apparatus includes generator generating reference signal based on noise emitted from sound source, detector detecting level of reference signal and change in level, unit comparing change with threshold-value range and produce compared result, filter filtering reference signal, adaptive filter having variable filter coefficient, unit updating filter coefficient according to change of level of reference signal for obtaining an updated filter coefficient, unit stopping updating of filter coefficient in response to compared result when change falls outside threshold-value range, unit storing updated filter coefficient each time filter coefficient is updated, generator generating control signal using stored filter coefficient, unit generating control sound based on control signal, microphone detecting synthesis sound pressure of control sound and noise to produce an error signal, and unit setting stored filter coefficient to more accurate coefficient than stored filter coefficient based on error signal, and signal acquired by filtering control signal through filter.

摘要翻译： 装置包括基于声源发出的噪声发生器产生参考信号，检测器检测参考信号电平和电平变化，单位比较变化与阈值范围，产生比较结果，滤波滤波参考信号，具有可变滤波器系数的自适应滤波器， 单位根据参考信号电平的变化更新滤波器系数，以获得更新的滤波器系数;响应于当变化超出阈值范围时的比较结果，停止更新滤波器系数;单位存储每次滤波器系数更新的滤波器系数 发电机产生控制信号采用存储的滤波系数，单位产生控制声音基于控制信号，麦克风检测合成声压控制声和噪声产生误差信号，并将存储滤波器系数的单位设置为比基于存储滤波系数更精确的系数 上 误差信号和通过滤波器滤波控制信号获得的信号。

公开(公告)号：US06901147B1

公开(公告)日：2005-05-31

申请号：US09604904

申请日：2000-06-28

申请人： Akihiko Enamito ,  Takuro Hayashi ,  Kunio Matsukura ,  Satoshi Aoyagi ,  Tsutomu Shioyama

发明人： Akihiko Enamito ,  Takuro Hayashi ,  Kunio Matsukura ,  Satoshi Aoyagi ,  Tsutomu Shioyama

IPC分类号： A61F11/06 ,  G10K11/16 ,  G10K11/178 ,  H03B29/00

CPC分类号： G10K11/178 ,  G10K2210/12822

摘要： A three-dimension active silencer includes a measuring unit for detecting a signal relating to a sound radiated from a target sound source which is located in a closed box. A plurality of additional sound sources are arranged around the target sound source. A microphone is arranged at a predetermined position for detecting a sound power at the position. A controller is adapted to control respective amplitudes of the additional sound sources which can be different from an amplitude of the target sound source and respective phases of the additional sound sources, based on the signal detected by the measuring unit, in such a manner that the microphone detects the lowest sound power. The additional sound sources are arranged in such a manner that a position xp of the target sound source, respective relative positions di (i=1, 2, . . . , N) of the N additional sound sources from the target sound source and a wave number k of the sound radiated from the target sound source can substantially satisfy the following expression. 1 N ⁢   ⁢ ∑ i = 1 N ⁢   ⁢ cos ⁢   ⁢ k ⁢   ⁢ ( x p - d i ) - cos ⁢   ⁢ k · x p ≅ 0 According to the feature, it can be achieved to reduce the total sound power in the closed box including the target sound source.

公开(公告)号：US06192133B1

公开(公告)日：2001-02-20

申请号：US08932176

申请日：1997-09-17

申请人： Akihiko Enamito ,  Takuro Hayashi

发明人： Akihiko Enamito ,  Takuro Hayashi

IPC分类号： A61F1106

CPC分类号： G10K11/178 ,  A61F2011/145

摘要： A speaker, serving as an additional sound source, is provided close to a noise source, two microphones are arranged on a central axis of a vibration surface of the speaker to be spaced from each other, acoustic intensity of the speaker is measured from outputs of these microphones, and an input to the speaker is controlled by a controller such that acoustic intensity, that is, acoustic power of the speaker is set to be zero or minimized.

摘要翻译： 作为附加声源的扬声器靠近噪声源提供，在扬声器的振动表面的中心轴上布置两个麦克风以彼此间隔开，扬声器的声强度从 这些麦克风和扬声器的输入由控制器控制，使得扬声器的声学强度，即声音功率被设置为零或最小化。

公开(公告)号：US5544074A

公开(公告)日：1996-08-06

申请号：US378935

申请日：1995-01-26

申请人： Takehiko Suzuki ,  Shozo Taniguchi ,  Kohji Kanemaru ,  Yoshiyuki Sato ,  Akihiko Enamito

发明人： Takehiko Suzuki ,  Shozo Taniguchi ,  Kohji Kanemaru ,  Yoshiyuki Sato ,  Akihiko Enamito

IPC分类号： G01M3/00 ,  G01M3/24 ,  G01F1/66

CPC分类号： G01M3/005 ,  G01M3/243

摘要： A device for detecting the position of a physical defect on a buried pipe includes a leak-of-fluid signal detector, a number of vibration signal detectors, and a device body and can detect the position of a site of a leak, into the ground, of a fluid running through a fluid pipe buried beneath the ground surface. The device body calculates vibration amplitudes and speeds via associated vibration signal detectors with the use of the outputs of the respective vibration signal detectors, calculates cross-correlation functions of the vibration amplitudes and speeds with the use of the vibration amplitudes and speeds and the output of the leak-of-fluid signal detector, calculates the amplitude intensity for each cross-correlation function, and generates resultant vector data representing the position of the leak-of-fluid site with the use of the vibration intensity.

摘要翻译： 用于检测埋管的物理缺陷的位置的装置包括泄漏流体信号检测器，多个振动信号检测器和装置主体，并且可以将泄漏部位的位置检测到地面 流过穿过地下表面的流体管的流体。 装置主体利用相应的振动信号检测器的输出，通过相关联的振动信号检测器来计算振幅和速度，利用振动幅度和速度以及振动幅度和速度的输出来计算振幅和速度的互相关函数 流量泄漏信号检测器计算每个互相关函数的振幅强度，并使用振动强度产生表示流体泄漏点位置的合成矢量数据。