中科微点-全球专利检索

  1. Login
  2. Sign Up

Search Results

190 records (took 0.025 seconds)

    DIGITAL VIRTUAL EARTH ACTIVE CANCELLATION SYSTEM
    51.
    发明专利
    DIGITAL VIRTUAL EARTH ACTIVE CANCELLATION SYSTEM 未知

    公开(公告)号：AU7240491A

    公开(公告)日：1991-09-03

    申请号：AU7240491

    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

    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.

    PIEZO SPEAKER AND INSTALLATION METHOD FOR LAPTOP PERSONAL COMPUTER AND OTHER MULTIMEDIA APPLICATIONS
    52.
    发明申请
    PIEZO SPEAKER AND INSTALLATION METHOD FOR LAPTOP PERSONAL COMPUTER AND OTHER MULTIMEDIA APPLICATIONS 审中-公开
    PIEZO扬声器及其个人计算机和其他多媒体应用的安装方法

    公开(公告)号：WO1996001547A2

    公开(公告)日：1996-01-18

    申请号：PCT/US1995008131

    申请日：1995-06-29

    Applicant: NOISE CANCELLATION TECHNOLOGIES, INC.

    Inventor： NOISE CANCELLATION TECHNOLOGIES, INC. ,  CONLEY, John, K. ,  KOKONASKI, William ,  PARRELLA, Michael, J. ,  MACHACEK, Steven, L.

    IPC: H04R17/00

    CPC classification number: G06F1/1616 ,  G06F1/1632 ,  G06F1/1688 ,  H04R7/04 ,  H04R17/00

    Abstract: This application outlines several applications of a piezoelectric materials invention to produce quality loudspeakers in applications where coil driven dynamic speakers are difficult or impossible to implement with an appreciable degree of sound quality. This invention includes a series of modifications to a laptop computer such as the IBM 750c. The modifications to the computer consist of placing piezoelectric patches behind the LCD and directly to the back wall of the laptop lid. Damping materials and stiffeners are also added to the back wall to reduce structural resonance. A system consisting of an audio amplifier and transformer is used to drive the piezo speaker.

    Abstract translation: 该应用概述了压电材料发明的几个应用，以在线圈驱动的动态扬声器难以或不可能以可观的音质程度实现的应用中产生优质扬声器。 本发明包括对诸如IBM 750c之类的膝上型计算机的一系列修改。 对计算机的修改包括将LCD上的压电贴片放置在笔记本电脑盖子的后壁上。 阻尼材料和扶强材也被添加到后壁以减少结构共振。 由音频放大器和变压器组成的系统用于驱动压电扬声器。

    NOISE ATTENUATION SYSTEM FOR VIBRATORY FEEDER BOWL
    57.
    发明申请
    NOISE ATTENUATION SYSTEM FOR VIBRATORY FEEDER BOWL 审中-公开
    用于振动送料器的噪声衰减系统

    公开(公告)号：WO1994027534A1

    公开(公告)日：1994-12-08

    申请号：PCT/US1994005641

    申请日：1994-05-24

    Applicant: NOISE CANCELLATION TECHNOLOGIES, INC.

    Inventor： NOISE CANCELLATION TECHNOLOGIES, INC. ,  SCRIBNER, Kelvin ,  HODGSON, Doug

    IPC: A61F11/06

    CPC classification number: G10K11/178 ,  G10K2210/114 ,  G10K2210/129 ,  G10K2210/501 ,  G10K2210/509

    Abstract: An active noise cancellation system for attenuating both mechanical vibration and the acoustic noise occasioned by the operation of vibratory feeder bowls in manufacturing having an accelerometer (58) adjacent the feeder bowl and an inertial actuator (57) for detecting the mechanical vibration and generating the disturbance for attenuating the vibration respectively, microphones (56, 57) and loudspeakers (52, 53) for detecting the acoustic noise and generating the counter acoustic noise respectively, and a controller (59) to control both the disturbances.

    Abstract translation: 一种主动噪声消除系统，用于在具有邻近馈送碗的加速度计（58）和用于检测机械振动并产生扰动的惯性致动器（57）的制造中衰减由振动进料碗操作引起的机械振动和声音噪声 分别用于衰减振动的麦克风（56,57）和扬声器（52,53），用于分别检测声学噪声并产生反声学噪音;以及控制器（59），用于控制两个干扰。

    IMPROVED METHOD AND SYSTEM FOR ON-LINE SYSTEM IDENTIFICATION
    59.
    发明申请
    IMPROVED METHOD AND SYSTEM FOR ON-LINE SYSTEM IDENTIFICATION 审中-公开
    改进的在线系统识别方法和系统

    公开(公告)号：WO1994017762A1

    公开(公告)日：1994-08-18

    申请号：PCT/US1994001187

    申请日：1994-02-08

    Applicant: NOISE CANCELLATION TECHNOLOGIES, INC.

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

    IPC: A61F11/06

    CPC classification number: G05B17/02 ,  G10K11/178 ,  G10K2210/3018 ,  G10K2210/30232 ,  G10K2210/3025 ,  G10K2210/3033 ,  G10K2210/30351 ,  G10K2210/3045 ,  G10K2210/3057 ,  H03H21/0012

    Abstract: This invention relates to an improved method of on-line system identification for use with active control systems. The method requires less computation and reduces the problem of coefficient jitter in the filters (12, 22) of the active control system. The system of this invention uses a fixed test signal (y(n)) which is designed to have a particular power spectrum. In one embodiment of the invention the spectrum is chosen to be "block white", in another the spectrum is chosen to be dependent upon the spectrum of the residual signal and/or the amplitude of the system transfer function. The use of a fixed test signal reduces the computational requirement of the system identification. In another aspect of the invention, a means (model) is provided for estimating the effect of the test signal and subtracting this from the residual (error) (u(n)) signal used to adapt the control system. This greatly reduces the problem of coefficient or weight jitter.

    Abstract translation: 本发明涉及一种用于主动控制系统的在线系统识别的改进方法。 该方法需要更少的计算，并且减少了主动控制系统的滤波器（12,22）中的系数抖动的问题。 本发明的系统使用被设计为具有特定功率谱的固定测试信号（y（n））。 在本发明的一个实施例中，频谱被选择为“块白”，另一个频谱被选择为取决于残差信号的频谱和/或系统传递函数的振幅。 使用固定的测试信号可以减少系统识别的计算需求。 在本发明的另一方面，提供了一种用于估计测试信号的影响并从用于调整控制系统的残差（误差）（u（n））信号中减去这一点的装置（模型）。 这大大减少了系数或重量抖动的问题。

Patent Agency Ranking