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    INTEGRATED HYDRAULIC MOUNT FOR ACTIVE VIBRATION CONTROL SYSTEM
    124.
    发明公开
    INTEGRATED HYDRAULIC MOUNT FOR ACTIVE VIBRATION CONTROL SYSTEM 失效
    集成液压轴承主动振动系统。

    公开(公告)号：EP0524236A1

    公开(公告)日：1993-01-27

    申请号：EP91907653.0

    申请日：1991-04-09

    Applicant: NOISE CANCELLATION TECHNOLOGIES, INC.

    Inventor： GOSSMAN, William, E. ,  BURKE, Michael, J.

    IPC: F16F13 ,  F16F15

    CPC classification number: F16F13/26 ,  F16F15/027

    Abstract: Bâti vibrant à régulation active (142) permettant de transmettre les forces statiques d'une machine (23) à un support en découplant la transmission des forces vibratoires dynamiques. Le bâti procure une réduction des pertes dynamiques entre une zone d'origine (152) et une zone d'application (130, 132), à l'effet de réguler de manière active les vibrations d'un élément vibrant (23). Ces pertes dynamiques sont rendues aussi faibles que possible en réduisant au minimum la masse et la vitesse du fluide pompé en faisant circuler ce dernier par des conduites courtes et de forte section (144, 146). Le dispositif est conçu de manière à ce que les forces soient dirigées vers l'élément vibrant (23) selon un seul axe (x) et à limiter l'application de forces dans des directions autres que celle selon laquelle il fait effet.

    IN-WIRE SELECTIVE CANCELLATION SYSTEM
    125.
    发明公开
    IN-WIRE SELECTIVE CANCELLATION SYSTEM 失效
    WIRED选择性消防系统的。

    公开(公告)号：EP0496797A1

    公开(公告)日：1992-08-05

    申请号：EP90915900.0

    申请日：1990-10-16

    Applicant: NOISE CANCELLATION TECHNOLOGIES, INC.

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

    IPC: H03H21 ,  H04B1 ,  H04B3

    CPC classification number: H04B3/00 ,  H03H21/0001

    Abstract: Système d'annulation active en circuit permettant d'annuler des composantes de signal répétitives indésirables d'un signal électronique primaire comprenant des composantes de signal intelligentes voulues ainsi que des composantes de signal répétitives indésirables. Le signal (101) électronique primaire est transmis en tant qu'entrée à un mélangeur (106) électronique. Une seconde entrée dudit mélangeur (106) électronique reçoit un signal d'annulation répétitive généré par un contrôleur (103) d'annulation active, destiné à annuler la composante du signal répétitive indésirable du signal (10) primaire, sans gêner le passage des composantes de signal intelligentes du signal primaire.

    Variable gain active noise cancellation system with improved residual noise sensing
    127.
    发明公开
    Variable gain active noise cancellation system with improved residual noise sensing 失效
    活性Lärmunterdruckungsanordnung可变增益和改善的残余噪声测量

    公开(公告)号：EP0967592A3

    公开(公告)日：2000-03-15

    申请号：EP99203047.8

    申请日：1994-06-23

    Applicant: NOISE CANCELLATION TECHNOLOGIES, INC.

    Inventor： Jones, Owen

    IPC: G10K11/178

    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.

    Variable gain active noise cancellation system with improved residual noise sensing
    128.
    发明公开
    Variable gain active noise cancellation system with improved residual noise sensing 失效
    AktiveLärmunterdruckungsanordnungmit variablerVerstärkungund verbesserterRestlärmmessung

    公开(公告)号：EP0967592A2

    公开(公告)日：1999-12-29

    申请号：EP99203047.8

    申请日：1994-06-23

    Applicant: NOISE CANCELLATION TECHNOLOGIES, INC.

    Inventor： Jones, Owen

    IPC: G10K11/178

    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.

    Abstract translation: 有源噪声消除系统包括一系列功能，可以更有效的消除，更高的可靠性和更好的稳定性。 适用于耳机系统的特定特征包括将距离声发生器中心径向偏移的剩余麦克风定位成检测更类似于在用户鼓膜上入射的信号。 此外，开放式耳机设计包括耳机侧面的穿孔而不是背部，使得穿孔不易受到意外的堵塞。 该系统还包括用于检测可能由例如通过施加在听筒上的压力引起的环境的声学特性的变化的机构，并且可能使取消系统不稳定。 系统自动响应这种变化，例如通过降低系统的增益或频率响应来保持稳定性。 该系统还包括用于检测即将发生的不稳定性和补偿的其他方法，例如检测不稳定性开始特征的增强频率内的信号的开始，以及调整系统的频率响应的增益或抑制增强的信号。 该系统还包括一种机构，用于通过在声级较低时关闭系统来节省电池寿命，或者调整系统的电源以对应于系统的当前功率需求。

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