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    Piezo speaker for improved passenger cabin audio systems
    151.
    发明公开
    Piezo speaker for improved passenger cabin audio systems 失效
    Piedzolautsprecherfürverbesserte Passagierkabinen-Audiosysteme

    公开(公告)号：EP0936842A1

    公开(公告)日：1999-08-18

    申请号：EP99108305.6

    申请日：1996-09-25

    Applicant: NOISE CANCELLATION TECHNOLOGIES, INC.

    Inventor： Eatwell, Graham Paul ,  Machacek, Steven L. ,  Parrella, Michael J.

    IPC: H04R25/00 ,  H04B1/00 ,  H03B29/00 ,  H04R17/00

    CPC classification number: H04R17/00 ,  H04R7/04

    Abstract: A loudspeaker system module is disclosed, the module comprising a piezoelectric element subject to displacement by applied electric potential and having a top side and an under side, a panel diaphragm that is driven by the piezoelectric element and to which the under side of the piezoelectric element is joined, and means for reducing structural resonances in the panel diaphragm.

    Abstract translation: 公开了一种扬声器系统模块，该模块包括经受施加电位而位移并具有顶侧和下侧的压电元件，由压电元件驱动的面板隔膜，压电元件的下侧 和用于减小面板隔膜中的结构共振的装置。

    PIEZOELECTRIC TRANSDUCERS
    154.
    发明公开
    PIEZOELECTRIC TRANSDUCERS 失效
    压电转换器

    公开(公告)号：EP0872158A1

    公开(公告)日：1998-10-21

    申请号：EP96937877.0

    申请日：1996-11-04

    Applicant: NOISE CANCELLATION TECHNOLOGIES, INC.

    Inventor： WARNAKA, Glenn, E. ,  WARNAKA, Mark, E.

    IPC: H04R17 ,  H04R7

    CPC classification number: H04R17/00 ,  H04R7/045

    Abstract: The invention consists of a piezoelectric material (11), a substrate or spacer (12) and an electrical connector means (13) for a wire harness or other electrical connection. The substrate (12) is used to enhance the motion of the piezoelectric element (11) by spacing the piezoelectric element (11) from the diaphragm. The substrate (12) is larger in area than the piezoelectric element (11). The transducer system (10) acts to impart motion to the diaphragm. The transducer (10) comprises a piezoelectric element (11) subject to displacement by applied electric potential (13) that has a top side, an underside and an outer perimeter. The substrate (12) is joined to the underside of the piezoelectric element (11). A means (15) applies electric potential to the piezoelectric element (11).

    PIEZO SPEAKER FOR IMPROVED PASSENGER CABIN AUDIO SYSTEMS
    155.
    发明公开
    PIEZO SPEAKER FOR IMPROVED PASSENGER CABIN AUDIO SYSTEMS 失效
    压电扬声器是提高乘客舱室音频系统

    公开(公告)号：EP0872157A1

    公开(公告)日：1998-10-21

    申请号：EP96933882.0

    申请日：1996-09-25

    Applicant: NOISE CANCELLATION TECHNOLOGIES, INC.

    Inventor： EATWELL, Graham, P. ,  PARRELLA, Michael, J. ,  MACHACEK, Steven, L.

    IPC: H04R7 ,  H04R17

    CPC classification number: H04R17/00 ,  H04R7/04

    Abstract: This invention outlines several applications of piezoelectric vibrators (4) to produce quality flat panel speakers in passenger cabin applications. A system consisting of an audio amplifier (2) and transformer (3) is used to drive the piezo speaker (4). The electronics are packaged (8) so that they fit in small modules that can be attached to a cabin structure to produce a speaker. The invention includes a variety of flat panel speaker designs, including one in which the existing structure is converted into a speaker, and thin membrane and/or panels that are fitted with piezoelectric elements (Figures 5 and 6). A system consisting of cabin quieting and flat panel speakers is also discussed where the mid and high frequency audio is produced by panel speakers (74-79) and the low frequency audio is produced from dynamic loudspeakers (80-84). The cabin systems discussed in this patent are applicable to automobiles, aircraft, trucks and buses.

    VARIABLE GAIN ACTIVE NOISE CANCELLATION SYSTEM WITH IMPROVED RESIDUAL NOISE SENSING
    159.
    发明公开
    VARIABLE GAIN ACTIVE NOISE CANCELLATION SYSTEM WITH IMPROVED RESIDUAL NOISE SENSING 失效
    ACTIVELÄRMUNTERDRUCKUNGSANORDNUNG可变增益和改进的残余噪声测量

    公开(公告)号：EP0705472A1

    公开(公告)日：1996-04-10

    申请号：EP94922444.0

    申请日：1994-06-23

    Applicant: NOISE CANCELLATION TECHNOLOGIES, INC.

    Inventor： JONES, Owen

    IPC: A61F11 ,  G10K11

    CPC classification number: G10K11/17857 ,  A61F2011/145 ,  G10K11/17855 ,  G10K11/17881 ,  G10K11/17885 ,  G10K2210/108 ,  G10K2210/1081 ,  G10K2210/3011 ,  G10K2210/3013 ,  G10K2210/3019 ,  G10K2210/3028 ,  G10K2210/3056 ,  G10K2210/3214 ,  G10K2210/503

    Abstract: An active noise cancellation system includes a series of features for more effective cancellation, greater reliability, and improved stability. A particular feature adapted for headset systems includes locating a residual microphone radially offset from the centre of a sound generator to detect a signal more similar to that incident upon the eardrum of the user. In addition, an open back headset design includes perforations on the side of the headset instead of the back, so that the perforations are less susceptible to inadvertent blockage. The system also includes a mechanism for detecting changes in the acoustic characteristics of the environment that may be caused, for example, by pressure exerted upon the earpieces, and that may destabilize the cancellation system. The system automatically responds to such changes, for example, by reducing the gain or the frequency response of the system to preserve stability. The system further includes other methods for detecting imminent instability and compensating, such as detecting the onset of signals within enhancement frequencies characteristic of the onset of instability, and adjusting the gain of frequency response of the system or suppressing the enhanced signals. The system further includes a mechanism for conserving battery life by turning the system off when sound levels are low, or adjusting the power supply to the system to correspond to the current power requirements of the system.

    ACTIVE CONTROL OF MACHINE PERFORMANCE
    160.
    发明授权
    ACTIVE CONTROL OF MACHINE PERFORMANCE 失效
    一机多用的性能主动控制。

    公开(公告)号：EP0516705B1

    公开(公告)日：1995-08-16

    申请号：EP91904982.5

    申请日：1991-02-20

    Applicant: NOISE CANCELLATION TECHNOLOGIES, INC.

    Inventor： ROSS, Colin, Fraser ,  LANGLEY, Andrew, John ,  EATWELL, Graham, Paul

    IPC: F02B27/00 ,  F01N1/06

    CPC classification number: F01N1/065 ,  F02B27/001 ,  F02M35/1038 ,  F02M35/125 ,  Y02T10/146

    Abstract: 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.

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