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    MULTIPLE INTERACTING DVE ALGORITHM
    22.
    发明申请
    MULTIPLE INTERACTING DVE ALGORITHM 审中-公开
    多重交互DVE算法

    公开(公告)号：WO1994004980A1

    公开(公告)日：1994-03-03

    申请号：PCT/US1992007650

    申请日：1992-09-15

    Applicant: NOISE CANCELLATION TECHNOLOGIES, INC. ,  ZIEGLER, Eldon, Jr.

    Inventor： NOISE CANCELLATION TECHNOLOGIES, INC.

    IPC: G06F15/31

    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.

    Abstract translation: 一种数字虚拟地球（DVE）取消系统，其通过表示要被取消的残余现象的多个传感器（1,2,3）接收现象输入信号，并且具有用于多个传感器/ 致动器对（1,4,2,5,3,6），其产生用于相关联的致动器（4,5,6）的适当的消除信号（19,20,21）。 多重相互作用的DVE（MIDVE）算法通过从残差信号（16,17,18）中减去每个致动器信号（19,20,21）的组合效应来估计每个传感器（1,2,3）处的噪声， 该传感器（1,2,3）。 该估计噪声信号用于控制与目标致动器（4,5,6）相关联的自适应滤波器（12,24,25）。 这些滤波器（12,24,25）接收估计的噪声作为输入。 然后，它们通过用滤波器权重滤除估计的噪声来产生消除信号。 这些权重使用剩余信号（16,17,18）和与系统脉冲响应卷积的估计噪声进行调整。

    VACUUM SPEAKER
    25.
    发明申请
    VACUUM SPEAKER 审中-公开
    真空扬声器

    公开(公告)号：WO1993007729A1

    公开(公告)日：1993-04-15

    申请号：PCT/US1991007324

    申请日：1991-10-02

    Applicant: NOISE CANCELLATION TECHNOLOGIES, INC. ,  LANGLEY, Andrew, J. ,  PARRELLA, Michael, J. ,  DENENBERG, Jeffrey, N.

    Inventor： NOISE CANCELLATION TECHNOLOGIES, INC.

    IPC: H04R25/00

    CPC classification number: H04R1/22 ,  H04R1/42 ,  H04R9/02

    Abstract: A closed box loudspeaker system (9) which has the back of the loudspeaker sealed by a small closed chamber containing a gas which acts like mechanical spring connected to the loudspeaker diaphragm (1). The system avoids the problems inherent in large back chambers by altering the static pressure in the back chamber. To counterbalance the differential pressures either a spring flexible diaphragm (2) or bellows (21) is employed.

    Abstract translation: 一个封闭的盒式扬声器系统（9），其扬声器的后部由一个小的封闭的腔室密封，该小型封闭的腔室包含一个类似机械弹簧的气体，其作用与扬声器隔膜（1）相连。 该系统通过改变后室中的静压来避免大后室中固有的问题。 为了平衡差压，采用弹性柔性隔膜（2）或波纹管（21）。

    ACTIVE SOUND ATTENUATION SYSTEM FOR ENGINE EXHAUST SYSTEMS AND THE LIKE
    26.
    发明申请
    ACTIVE SOUND ATTENUATION SYSTEM FOR ENGINE EXHAUST SYSTEMS AND THE LIKE 审中-公开
    用于发动机排气系统的主动声衰减系统

    公开(公告)号：WO1989007701A1

    公开(公告)日：1989-08-24

    申请号：PCT/US1989000665

    申请日：1989-02-17

    Applicant: NOISE CANCELLATION TECHNOLOGIES, INC. ,  GARDNER, John, W. ,  ZIEGLER, Eldon, W., Jr.

    Inventor： NOISE CANCELLATION TECHNOLOGIES, INC.

    IPC: F01N01/06

    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.

    Abstract translation: 公开了一种用于内燃机排气系统等的主动声衰减系统。 该系统包括反噪声声波发生器（19），其通过介于波发生器（19）和介质之间的声学​​调谐的抗噪声室（5,11）来保护传播无用噪声的介质的环境， 不良噪音 为了在排气管（10）的出口端（4）处提供噪声消除，防噪声室（5,11）具有基本上设置在排气管出口的平面中的环形开口，从而提供有效的共同点源 对于传播的不良噪声和反噪声声波。

    ACTIVE CONTROL OF MACHINE PERFORMANCE
    28.
    发明专利
    ACTIVE CONTROL OF MACHINE PERFORMANCE 未知

    公开(公告)号：AU638808B2

    公开(公告)日：1993-07-08

    申请号：AU7337691

    申请日：1991-02-20

    Applicant: NOISE CANCELLATION TECHNOLOGIES INC.

    Inventor： COLIN FRASER ROSS ,  ANDREW JOHN LANGLEY ,  GRAHAM PAUL EATWELL

    IPC: F01B25/02 ,  F01N1/06 ,  F02B27/00 ,  F02B27/06 ,  F02M35/12

    Abstract: PCT No. PCT/GB91/00266 Sec. 371 Date Aug. 20, 1992 Sec. 102(e) Date Aug. 20, 1992 PCT Filed Feb. 2, 1991 PCT Pub. No. WO91/13243 PCT Pub. Date Sep. 5, 1991.A control system is described for improving continuous dynamical control on the pressure in the outlet or inlet system (3) or both of a machine (1) in order to control the performance of the machine. The system comprises an actuator (4) for varying the pressure in the selected system, a sensor (8) for monitoring the operation of the machine and producing a signal indicative thereof, and control means (5) responsive to the sensor signals for driving the actuator, wherein the control means operates to adjust the machine performance according to predetermined data, to optimise the machine performance. The data may be in a memory (look-up table) or the control means may operate in accordance with an algorithm. A second sensor may be provided to generate a signal indicative of sound produced by one or other or both of the outlet and inlet systems to produce signals to enable the control means simultaneously to reduce noise generated by the machine as well as to improve the performance of the machine by active feedback.

    Decorative speaker cover
    29.
    发明专利
    Decorative speaker cover 未知

    公开(公告)号：AU2311099A

    公开(公告)日：1999-07-26

    申请号：AU2311099

    申请日：1999-01-06

    Applicant: NOISE CANCELLATION TECHNOLOGIES INC

    Inventor： CLAYBAUGH DAVID ,  O'BRIEN SEAN

    IPC: G10K11/00 ,  H04R1/02

    Abstract: A decorative speaker cover is disclosed that transforms any loudspeaker into a work of art. The decorative speaker cover of the invention consists of a sheet of material stretched across and adhered to a support frame. The sheet of material contains an artistic work like a picture, design, custom photograph, print, etc. The invention also includes methods for attaching the decorative speaker covers to a loudspeaker cabinet. The disclosed methods allow speaker covers to be readily changed.

    IN-WIRE SELECTIVE CANCELLATION SYSTEM
    30.
    发明专利
    IN-WIRE SELECTIVE CANCELLATION SYSTEM 未知

    公开(公告)号：AU6616490A

    公开(公告)日：1991-05-16

    申请号：AU6616490

    申请日：1990-10-16

    Applicant: NOISE CANCELLATION TECHNOLOGIES INC

    Inventor： ZIEGLER ELDON W JR ,  GARDNER JOHN W

    IPC: H03H21/00 ,  H04B1/10 ,  H04B3/00 ,  H03B1/00 ,  H03K5/00

    Abstract: An in wire active cancelling system cancels undesirable repetitive signal components from a primary electronics signal controlling desired intelligent signal components and undesirable repetitive signal components. The primary electronic signal is fed as an input to an electronic mixer. A second input to the electronic mixer is a repetitive cancelling signal which is applied by the mixer to cancel the undesirable repetitive signal component from the primary signal without interfering with passage of the primary signal intelligent signal components. The repetitive cancellation signal is developed from a residual signal developed by the mixer and a timing signal obtained from a timing signal generator.

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