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    Circuit antitheft and disabling mechanism
    1.
    发明授权
    Circuit antitheft and disabling mechanism 失效
    电路防盗和禁用机制

    公开(公告)号：US5739754A

    公开(公告)日：1998-04-14

    申请号：US681742

    申请日：1996-07-29

    申请人： Alejandro Gabriel Schrott ,  Michael John Brady ,  Thomas A. Cofino ,  Richard Joseph Gambino ,  Robert Jacob Von Gutfeld ,  Harley Kent Heinrich ,  Paul Andrew Moskowitz

    发明人： Alejandro Gabriel Schrott ,  Michael John Brady ,  Thomas A. Cofino ,  Richard Joseph Gambino ,  Robert Jacob Von Gutfeld ,  Harley Kent Heinrich ,  Paul Andrew Moskowitz

    IPC分类号： G08B13/14

    CPC分类号： G08B13/1409

    摘要： The present invention is a magnetic sensor used with one or more frequency band pass filters and a logic circuit that produces a ("critical") signal that is used for enabling and disabling an external electronic circuit, e.g. a computer circuit. The magnetic sensor produces a signal when excited by an externally applied alternating current (ac) magnetic field. The external ac magnetic field can comprise one or more frequencies, each of which induces an electrical signal at the respective frequency in the sensor. Depending on the linearity of the sensor, one or more harmonic frequencies of the signal frequencies can also be induced in the sensor. One or more bandpass filters is connected to the magnetic sensor and each of the bandpass filters is tuned to filter the signal to select filtered signals, from the output of the sensor. A logic circuit is activated by one or more of the filtered signals or a combination of one or more of the signal frequencies. When the logic circuit is activated, a critical signal is applied to an electronic circuit to enable or disable the external electronic circuit.

    摘要翻译： 本发明是与一个或多个频带通滤波器一起使用的磁传感器和产生用于启用和禁用外部电子电路的（“临界”）信号的逻辑电路，例如， 一个电脑电路。 当由外部施加的交流（ac）磁场激励时，磁传感器产生信号。 外部交流磁场可以包括一个或多个频率，每个频率在传感器中以相应的频率感应电信号。 根据传感器的线性度，也可以在传感器中感应出信号频率的一个或多个谐波频率。 一个或多个带通滤波器连接到磁传感器，并且每个带通滤波器被调谐以对信号进行滤波以从传感器的输出中选择滤波信号。 逻辑电路由一个或多个滤波信号或一个或多个信号频率的组合激活。 当逻辑电路被激活时，关键信号被施加到电子电路以启用或禁用外部电子电路。