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    ULTRA QUIET VACUUM CLEANER
    181.
    发明公开
    ULTRA QUIET VACUUM CLEANER 失效
    超低噪音吸尘器。

    公开(公告)号：EP0683639A1

    公开(公告)日：1995-11-29

    申请号：EP94907955.0

    申请日：1994-02-08

    Applicant: NOISE CANCELLATION TECHNOLOGIES, INC.

    Inventor： SMITH, Dexter, G. ,  NOWICKI, Christopher, P. ,  ARNOLD, Michael, F.

    IPC: A47L9

    CPC classification number: A47L9/0081

    Abstract: An ultra-quiet vacuum cleaner system having an active noise controller (26) adapted to measure with microphones (28), (29) the noise generated by the system and to provide via a speaker (27) an equal counter-noise to thereby attenuate the generated noise. The system also includes designing the coupling (22) between the bag cavity (20) and the motor chamber (23) and the motor chamber (23) itself as structures for reducing noise.

    ACTIVE ACOUSTIC TRANSMISSION LOSS BOX
    182.
    发明公开
    ACTIVE ACOUSTIC TRANSMISSION LOSS BOX 失效
    ACTIVE传声损失。

    公开(公告)号：EP0664044A1

    公开(公告)日：1995-07-26

    申请号：EP93904473.0

    申请日：1992-10-08

    Applicant: NOISE CANCELLATION TECHNOLOGIES, INC.

    Inventor： FULLER, Chris ,  McLOUGHLIN, Michael ,  HILDEBRAND, Steve

    IPC: G10K11

    Abstract: The invention relates to noise or sound control achieved by enclosing the noise source in an active enclosure (10). Arrays of vibration inputs such as shakers, piezoceramic, etc. (14, 15) are attached to the walls of the active enclosure, or loudspeakers located inside the enclosure can be used to excite the sites of the enclosure. An array of error microphones are located in the radiated acoustic field or PVDF strips (20, 21, 22) are positioned on the wall. A controller (19) senses the levels of sound observed at the error microphones (16, 17, 18) or PVDF film (20, 21, 22) and adjusts the oscillating inputs (in terms of frequency, content, phase and magnitude) to the active vibration inputs in order to minimize the radiated sound.

    MULTIPLE INTERACTING DVE ALGORITHM
    184.
    发明公开
    MULTIPLE INTERACTING DVE ALGORITHM 失效
    数字虚拟地球算法实现多重相互作用。

    公开(公告)号：EP0655151A1

    公开(公告)日：1995-05-31

    申请号：EP92920567.0

    申请日：1992-09-15

    Applicant: NOISE CANCELLATION TECHNOLOGIES, INC.

    Inventor： ZIEGLER, Eldon, Jr.

    IPC: G06F17 ,  G10K11 ,  H03H21

    CPC classification number: H03H21/0012 ,  G10K11/178 ,  G10K2210/3011 ,  G10K2210/3019 ,  G10K2210/30232 ,  G10K2210/3042 ,  G10K2210/3046

    Abstract: A digital virtual earth (DVE) cancellation system which receives a phenomena input signal via multiple sensors (1, 2, 3) representing residual phenomena to be canceled, and has adaptive filters (12, 24, 25) for each of the multiple sensor/actuator pairs, (1, 4, 2, 5, 3, 6) which generate the appropriate cancellation signal (19, 20, 21) for the associated actuator (4, 5, 6). The multiple interacting DVE (MIDVE) algorithm estimates the noise at each sensor (1, 2, 3) by subtracting out the combined effects of each actuator signal (19, 20, 21) from the residual signal (16, 17, 18) at that sensor (1, 2, 3). This estimated noise signal is used to control the adaptive filters (12, 24, 25) associated with the subject actuator (4, 5, 6). These filters (12, 24, 25) receive the estimated noise as input. They then produce the cancellation signals by filtering the estimated noise with the filter weights. These weights are adapted using the residual signal (16, 17, 18) and the estimated noise convolved with the system impulse responses.

    EP0521868A4 -
    186.
    发明公开
    EP0521868A4 - 失效
    EP0521868A4 - Google专利

    公开(公告)号：EP0521868A4

    公开(公告)日：1994-02-09

    申请号：EP91904237

    申请日：1991-02-07

    Applicant: NOISE CANCELLATION TECHNOLOGIES, INC.

    Inventor： ZIEGLER, ELDON, W., JR.

    IPC: G10K11/178 ,  H03H21/00 ,  H04B3/04 ,  G06F15/31

    CPC classification number: H03H21/0012 ,  G10K11/178 ,  G10K2210/3011

    Abstract: A digital virtual earth active cancellation system which receives a phenomena input signal representing residual phenomena to be cancelled and has an adaptive filter which generates a cancellation signal. A system impulse response is convolved with the cancellation signal and is subtracted from the input signal to produce an estimate of noise. This substantially eliminates the problems associated with destructive feedback due to phase shifts. The residual signal is used to control an adaptive filter that receives the estimated noise as an input. The adaptive filter produces the cancellation signal by filtering the estimated noise with filter weights that are adapted using the residual signal and the estimated noise convolved with the system impulse response.

    Abstract translation: 一种接收表示要被消除的残余现象的现象输入信号（r）并且具有产生消除信号（y）的自适应滤波器（44）的数字虚拟地球有源消除系统（14）。 系统脉冲响应（c）与消除信号（y）进行卷积并从输入信号（r）中减去以产生噪声（x）的估计。 自适应滤波器（44）通过用由系统脉冲响应（c）调整的滤波器权重（α）对估计噪声（x）进行滤波来产生消除信号（y）。 通过将噪声估计（x）与系统脉冲（c）进行卷积以使滤波器（44）适应，发送到适配器（50）的用于自适应滤波器（44）的值保持在剩余信号的90°相位内 （R）。 这实质上消除了与由于相移造成的破坏性反馈相关的问题，而不需要外部参考信号。

    EXHAUST GAS MUFFLER ARRANGEMENT FOR COMBUSTION ENGINE
    187.
    发明授权
    EXHAUST GAS MUFFLER ARRANGEMENT FOR COMBUSTION ENGINE 失效
    排气消声器系统用于内燃机MASCH九城。

    公开(公告)号：EP0373188B1

    公开(公告)日：1993-12-01

    申请号：EP89902911.0

    申请日：1989-02-17

    Applicant: NOISE CANCELLATION TECHNOLOGIES, INC.

    Inventor： GARDNER, John, W. ,  ZIEGLER, Eldon, W., Jr.

    IPC: F01N1/06

    CPC classification number: F01N1/22 ,  F01N1/065 ,  G10K11/178 ,  G10K2210/12822 ,  G10K2210/3227 ,  G10K2210/32272

    Abstract: An active sound attenuation system for combustion engine exhaust systems and the like is disclosed. The system includes counter-noise acoustic wave generators (19) that are protected from the environment of a medium propagating undesireable noise by an acoustically tuned anti-noise chamber (5, 11) interposed between the wave generators (19) and the medium with the undesirable noise. To provide for noise cancellation at an outlet end (4) of an exhaust pipe (10) the anti-noise chamber (5, 11) has an annular opening disposed substantially in the plane of the exhaust pipe outlet thereby giving an effective common point source for the propagated undesirable noise and the counter-noise acoustic wave.

    INTEGRATED HYDRAULIC MOUNT FOR ACTIVE VIBRATION CONTROL SYSTEM
    188.
    发明公开
    INTEGRATED HYDRAULIC MOUNT FOR ACTIVE VIBRATION CONTROL SYSTEM 失效
    用于主动振动控制系统的集成液压装置

    公开(公告)号：EP0524236A4

    公开(公告)日：1993-08-04

    申请号：EP91907653

    申请日：1991-04-09

    Applicant: NOISE CANCELLATION TECHNOLOGIES, INC.

    Inventor： GOSSMAN, WILLIAM, E. ,  BURKE, MICHAEL, J.

    IPC: F16F13/26 ,  F16F15/027 ,  F16F15/04 ,  F16M5/00

    CPC classification number: F16F13/26 ,  F16F15/027

    Abstract: An active-controlled vibrating mount (142) permits static forces from a machine (23) to support while decoupling the transmission of dynamic vibrational forces. The mount provides a reduction of force losses from a first generating area (152) to a second force applying area (130, 132) to actively control vibrations of a vibrating element (23). These force losses are minimized due to minimization of the mass and velocity of fluid pumped by pumping the fluid through the short large cross-sectional area passageways (144, 146). The device provides for proper channeling of the forces to the vibrating element (23) in a uniaxial direction (x) and constrains the application of forces in non-working directions.

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