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    HIGH TRANSMISSION LOSS PANEL
    41.
    发明申请
    HIGH TRANSMISSION LOSS PANEL 审中-公开
    高传输损失面板

    公开(公告)号：WO1994018616A1

    公开(公告)日：1994-08-18

    申请号：PCT/US1994001188

    申请日：1994-02-08

    Applicant: NOISE CANCELLATION TECHNOLOGIES, INC.

    Inventor： NOISE CANCELLATION TECHNOLOGIES, INC. ,  EATWELL, Graham, P.

    IPC: G05D16/00

    CPC classification number: E04B1/86 ,  E04B1/803 ,  E04B2001/8414 ,  E04B2001/8466 ,  Y02A30/242 ,  Y02B80/12

    Abstract: A high transmission loss panel for preventing unwanted source vibrations from being transmitted to the air which consists of a sealed volume with a fluid therein (vacuum space) between two leaves (Panel 1, Panel 2), which are respectively between two other fluids which are less compliant than the fluid in the sealed volume.

    Abstract translation: 一种高传输损耗面板，用于防止不必要的源振动传播到空气中，该空气由两个叶片之间的流体密封体积（真空空间）组成，两个叶片（面板1，面板2）分别位于两个其他流体之间 比密封体积中的流体柔顺。

    CONTROL SYSTEM FOR PERIODIC DISTURBANCES
    43.
    发明申请
    CONTROL SYSTEM FOR PERIODIC DISTURBANCES 审中-公开
    周期性干扰控制系统

    公开(公告)号：WO1994000930A1

    公开(公告)日：1994-01-06

    申请号：PCT/US1992005229

    申请日：1992-06-25

    Applicant: NOISE CANCELLATION TECHNOLOGIES, INC. ,  EATWELL, Graham

    Inventor： NOISE CANCELLATION TECHNOLOGIES, INC.

    IPC: H04B15/00

    CPC classification number: G10K11/178 ,  G10K2210/121 ,  G10K2210/3028 ,  G10K2210/3032 ,  G10K2210/3045

    Abstract: A control system for controlling periodic disturbances employing a delay inverse filter (5) for supplying a signal, in response to a disturbance signal received by a sensor (1), a variable delay circuit (6) which is adjusted such that the delay through the delayed inverse filter and the variable delay is equal to a whole number of cycles of the disturbance signal. The output from said variable delay circuit being supplied to an actuator (9) such that it is combined with said disturbance signal at the sensor.

    Abstract translation: 一种用于响应于由传感器（1）接收到的干扰信号提供信号的用于提供信号的延迟逆滤波器（5）来控制周期性干扰的控制系统，可调延迟电路（6）被调整为使得通过 延迟逆滤波器和可变延迟等于干扰信号的整数周期。 来自所述可变延迟电路的输出被提供给致动器（9），使得其与传感器处的所述干扰信号组合。

    ACTIVE VIBRATION CONTROL SYSTEM
    45.
    发明申请
    ACTIVE VIBRATION CONTROL SYSTEM 审中-公开
    主动振动控制系统

    公开(公告)号：WO1992008223A1

    公开(公告)日：1992-05-14

    申请号：PCT/GB1991001849

    申请日：1991-10-22

    Applicant: NOISE CANCELLATION TECHNOLOGIES INC. ,  ROSS, Colin, Fraser ,  EATWELL, Graham, Paul

    Inventor： NOISE CANCELLATION TECHNOLOGIES INC.

    IPC: G10K11/16

    CPC classification number: G10K11/178 ,  G10K2210/1282 ,  G10K2210/30232 ,  G10K2210/3045 ,  G10K2210/3046 ,  G10K2210/3055 ,  G10K2210/3212 ,  G10K2210/3216

    Abstract: An active vibration control system in which an input sensor (2) generates first signals representative of a primary vibration field, actuators (1) are driven by second signals to produce a secondary vibration field, monitoring sensors (3) producing third signals are positioned in a first region (4) differing from a second region where vibration is to be controlled, a controller (5) is responsive to the first signals to generate second signals which reduce vibration in the second region, and the controller is adaptive with reference to the first and third signals to maintain reduced vibration in the second region.

    Abstract translation: 一种主动振动控制系统，其中输入传感器（2）产生表示主振动场的第一信号，致动器（1）由第二信号驱动以产生二次振动场，产生第三信号的监测传感器（3）位于 第一区域（4）与要控制振动的第二区域不同，控制器（5）响应于第一信号产生减少第二区域中的振动的第二信号，并且控制器参照 第一和第三信号以在第二区域中保持减小的振动。

    NOISE REDUCING SYSTEM
    46.
    发明申请
    NOISE REDUCING SYSTEM 审中-公开
    噪声减少系统

    公开(公告)号：WO1991013429A1

    公开(公告)日：1991-09-05

    申请号：PCT/GB1991000265

    申请日：1991-02-20

    Applicant: NOISE CANCELLATION TECHNOLOGIES INC. ,  ROSS, Colin, Fraser ,  LANGLEY, Andrew, John ,  EATWELL, Graham, Paul

    Inventor： NOISE CANCELLATION TECHNOLOGIES INC.

    IPC: G10K11/16

    CPC classification number: G10K11/178 ,  G10K2210/108 ,  G10K2210/1081 ,  G10K2210/121 ,  G10K2210/3011 ,  G10K2210/3018 ,  G10K2210/511

    Abstract: An active control system for attenuating tonal noise in a defined region is described. In its most basic form the system includes sensors (1, 8) for generating signals indicative of the residual noise in the region after attenuation and the uncontrolled sound affecting the region, signal processing circuits (10, 26) for processing the generated signals differently depending on the tonal content thereof, an adaptive filter (5) supplied with at least one of the generated signals whose characteristic is controlled by the processing circuitry (10), a transducer (6) for producing tonal-noise-attenuating disturbance in the region and delay means (4) for delaying signals relating to the uncontrolled noise before or after or during the adaptive filtering. The system finds direct application in a personal headset or ear defender.

    Abstract translation: 描述了用于衰减限定区域中的音调噪声的主动控制系统。 在其最基本的形式中，系统包括用于产生指示衰减之后区域中的残余噪声的信号的传感器（1,8）和影响区域的不受控制的声音的信号处理电路（10,26），用于根据 在其音调内容上，提供有由特征由处理电路（10）控制的生成信号中的至少一个的自适应滤波器（5），用于在该区域中产生音调噪声衰减干扰的换能器（6），以及 延迟装置（4），用于在自适应滤波之前或期间延迟与不受控噪声有关的信号。 该系统可以直接应用于个人耳机或耳后卫。

    Variable gain active noise cancellation system with improved residual noise sensing
    48.
    发明专利
    Variable gain active noise cancellation system with improved residual noise sensing 未知

    公开(公告)号：AU7355594A

    公开(公告)日：1995-01-17

    申请号：AU7355594

    申请日：1994-06-23

    Applicant: NOISE CANCELLATION TECHNOLOGIES INC

    Inventor： JONES OWEN

    IPC: A61F11/14 ,  G10K11/178 ,  G10K11/16

    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.

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