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    Adaptive active noise cancellation apparatus
    2.
    发明授权
    Adaptive active noise cancellation apparatus 失效
    自适应主动噪声消除装置

    公开(公告)号：US5251262A

    公开(公告)日：1993-10-05

    申请号：US723420

    申请日：1991-06-28

    申请人： Seiichirou Suzuki ,  Susumu Saruta ,  Hiroshi Tamura

    发明人： Seiichirou Suzuki ,  Susumu Saruta ,  Hiroshi Tamura

    IPC分类号： G10K11/178 ,  G10K11/16

    CPC分类号： G10K11/1784 ,  G10K2210/1054 ,  G10K2210/3033 ,  G10K2210/30391 ,  G10K2210/3045

    摘要： An adaptive type active noise cancellation apparatus comprises a first sensor for detecting a noise generated by a noise source and outputting a detection signal, a filter having a predetermined filter coefficient and filtering the output signal from the first sensor by using the predetermined filter coefficient and outputting a filtered signal, a speaker for receiving the filtered signal and generating a sound corresponding to the filtered signal, an active noise cancellation control system for actively canceling a noise at a control target point by using the sound generated by the speaker, a second sensor, arranged at the control target point, for detecting a sound at the control target point and outputting a detection signal, and an adaptive control system for receiving the output signals from the first and second sensors and adaptively updating the filter coefficient in accordance with a change in state of a system to which the active noise cancellation control system is applied. The adaptive control system includes a switch for stopping the active noise cancellation control system in adaptive processing, and a correction system for correcting the output signal from the first sensor or the second sensor by using a transfer function corresponding to a delay in a spatial system between the speaker and the second sensor and a delay required for calculation processing.

    Active noise attenuating device
    7.
    发明授权
    Active noise attenuating device 失效
    主动噪声衰减装置

    公开(公告)号：US5535283A

    公开(公告)日：1996-07-09

    申请号：US174004

    申请日：1993-12-28

    申请人： Susumu Saruta ,  Yasuyuki Sekiguchi

    发明人： Susumu Saruta ,  Yasuyuki Sekiguchi

    IPC分类号： F16L55/04 ,  G10K11/16 ,  G10K11/178

    CPC分类号： G10K11/1784 ,  G10K2210/104 ,  G10K2210/112 ,  G10K2210/117 ,  G10K2210/3027 ,  G10K2210/3028 ,  G10K2210/3218

    摘要： An active noise attenuating device applied to a draft duct of an air condition system including a microphone disposed in a propagation path of noise for detecting the noise, a loud speaker disposed in the noise propagation path, a control circuit for producing a control signal on the basis of the detection signal from the microphone, the control signal being supplied to the loud speaker so that the speaker produces an interference sound having the same amplitude as of the noise detected by the microphone and a phase opposite to the noise, at a control point in the noise propagation path, and a high pass filter for damping or cutting off a frequency component contained in the control signal and belonging to a low frequency range in which the loud speaker is unable to reproduce the interference sound.

    摘要翻译： 一种主动噪声衰减装置，其应用于包括设置在用于检测噪声的噪声传播路径中的麦克风的空调系统的通风管道，设置在噪声传播路径中的扬声器，控制电路，用于产生控制信号 基于来自麦克风的检测信号，控制信号被提供给扬声器，使得扬声器在控制点处产生具有与由麦克风检测到的噪声相同的幅度和与噪声相反的相位的干扰声音 以及高通滤波器，用于阻尼或切断包含在控制信号中并且属于该扬声器不能再现干扰声的低频范围的频率分量。

    Active noise attenuating device of the adaptive control type
    8.
    发明授权
    Active noise attenuating device of the adaptive control type 失效
    自适应控制型有源噪声衰减器

    公开(公告)号：US5517571A

    公开(公告)日：1996-05-14

    申请号：US214325

    申请日：1994-03-17

    申请人： Susumu Saruta ,  Yasuyuki Sekiguchi

    发明人： Susumu Saruta ,  Yasuyuki Sekiguchi

    IPC分类号： F04C29/06 ,  G10K11/178 ,  A61F11/06 ,  H03B29/00 ,  H04B15/00

    CPC分类号： G10K11/1784 ,  G10K2210/112 ,  G10K2210/3017 ,  G10K2210/3045 ,  G10K2210/3049

    摘要： An active noise attenuating device includes a first microphone located in a propagation path of noise, a loud speaker located downstream from the first microphone, a second microphone located downstream from the loud speaker for receiving sound, and an operational unit for executing an operation on the basis of a detection signal from the first microphone to generate a control signal supplied to the loud speaker so that a sound interfering with the noise is produced. An operational factor of the operational unit is controlled by an adaptive controller on the basis of the detection signal from the second microphone so that an amount of noise attenuated by the sound produced from the loud speaker is rendered maximum. A transfer characteristic of a transfer path between the loud speaker and the second microphone is identified on the basis of the detection signals generated by the second microphone when a sound represented by a periodical identifying signal is produced in a plurality of periods. An operational factor of the adaptive controller is adjusted by an adaptive control identifying unit on the basis of the identified transfer characteristic.

    摘要翻译： 有源噪声衰减装置包括位于噪声传播路径中的第一麦克风，位于第一麦克风下游的扬声器，位于扬声器下游的用于接收声音的第二麦克风，以及用于对所述第一麦克风执行操作的操作单元 来自第一麦克风的检测信号的基础，以产生提供给扬声器的控制信号，从而产生干扰噪声的声音。 基于来自第二麦克风的检测信号，由自适应控制器控制操作单元的操作因素，使得由扬声器产生的声音衰减的噪声量最大化。 在由多个周期产生由周期性识别信号表示的声音的基础上，基于由第二麦克风产生的检测信号来识别扬声器和第二麦克风之间的传送路径的传送特性。 基于所识别的传送特性，通过自适应控制识别单元调整自适应控制器的操作系数。

    Active noise control apparatus for domestic appliance
    9.
    发明授权
    Active noise control apparatus for domestic appliance 失效
    家用电器主动噪声控制装置

    公开(公告)号：US5129003A

    公开(公告)日：1992-07-07

    申请号：US571409

    申请日：1990-08-23

    申请人： Susumu Saruta

    发明人： Susumu Saruta

    IPC分类号： F25D19/00 ,  F25B41/00 ,  G10K11/178 ,  H04R3/02

    CPC分类号： G10K11/1784 ,  F25B2500/12 ,  G10K2210/1054 ,  G10K2210/109 ,  G10K2210/3032 ,  G10K2210/3045

    摘要： An apparatus includes an electro-acoustic converter, a detector, a noise correlative signal generator, and an additional tone signal generator in order to actively control noise generated by an electromagnetic machine, which noise is apt to externally leak from an opening of a machine room storing the electromagnetic machine driven by an AC power supply. The electro-acoustic converter applies a predetermined sound wave to the opening of the machine room. The detector essentially detects a frequency of an AC voltage waveform to be applied to the electromagnetic machine driven by the AC power supply. The noise correlative signal generator generates generating a signal correlative with an electromagnetic noise component included in noise generated by the electromagnetic machine according to a detection signal from the detector. The additional tone signal generator generates, according to an output signal from the noise correlative signal generator, an additional tone signal for causing the electro-acoustic converter to apply a sound wave essentially having a phase opposite to and the same amplitude as those of the electromagnetic noise component at the opening of the machine room.