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    • 19. 发明授权
    • Security system employing radio transmitter and receiver
    • 采用无线电发射机和接收机的安全系统
    • US4090182A
    • 1978-05-16
    • US669277
    • 1976-03-22
    • Robert Bruno Young
    • Robert Bruno Young
    • G08B13/08G08B13/22
    • G08B25/008G08B13/08
    • A security system gives an alarm when unauthorized persons gain access to a protected space by opening a door or window, etc., but permits access by authorized persons without giving an alarm. The alarm is given automatically when the door or window, etc., is opened, unless the alarm is silenced by operation of a concealable portable transmitter, intended to be carried by authorized persons. The transmitter when actuated transmits a control signal, which may be coded, to a receiver-driver, which then completes a shunt circuit around the door or window, etc., so that the latter can be opened without setting off the alarm.In one embodiment of the invention, in which the receiver-driver depends upon house current for its operation, an alternative means of silencing the alarm is provided. If the house current fails, thereby rendering the receiver-driver inoperative, a second shunt circuit around the door or window, etc., is automatically armed, and the second shunt circuit can then be completed by manual operation of a lock-actuated switch. The key necessary to operate the lock is issued only to authorized persons.
    • 未经授权的人员通过打开门或窗等等可以进入受保护的空间,但是允许授权人员进入,而不发出警报,安全系统就会发出警报。 当门或窗等打开时,报警器自动发出,除非由授权人员携带的可隐藏便携式变送器的操作使报警器无效。 当被致动时,发射器将可编码的控制信号传送到接收器驱动器,接收机驱动器然后完成围绕门或窗等的分流电路,使得后者可以在不设置报警的情况下打开。