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    • 3. 发明授权
    • Surveillance system
    • 监管制度
    • US3740466A
    • 1973-06-19
    • US3740466D
    • 1970-12-14
    • JACKSON & CHURCH ELECTRONICS C
    • MARSHALL JBIGLOW J
    • G08B13/194G08B26/00H04N7/18
    • G08B13/19602G08B13/19634G08B13/19641G08B13/19669G08B13/19693G08B26/00
    • A method and apparatus by which surveillance can be maintained over a domain for detecting changes of interest in the domain and ignoring other changes. A parameter of the domain under surveillance is scanned resulting in an electrical signal which is sampled. The resulting sample signals each correspond to an individual sample point or line segment in the domain under surveillance and are digitized. Digitized samples are stored in a memory unit. An arithmetic unit based on a Karnaugh mapping technique compares to current sample with a prior sample from the memory unit for the same sample point or segment in the domain and provides an alert signal when these differ by more than a predetermined amount. A plurality of scanning devices may be provided to a monitor. If an alert occurs, an intrusion logic unit determines if an alert signal previously occurred during a prior scanning period for the same scanning device and if so an alarm is actuated and the monitor is switched to display the signal from that scanning device.
    • 可以通过域维护监视以检测域中感兴趣的变化并忽略其他变化的方法和装置。 扫描监视域的参数,得到采样的电信号。 所得到的采样信号各自对应于监视域内的单个采样点或线段,并被数字化。 数字样本存储在存储单元中。 基于Karnaugh映射技术的算术单元将当前采样与来自存储器单元的先前样本与域中的相同采样点或段进行比较,并且当这些采样点相差超过预定量时提供报警信号。 可以向监视器提供多个扫描装置。 如果发生警报,​​则入侵逻辑单元确定先前在同一扫描设备的扫描周期内是否发生警报信号,如果是,则启动警报并切换显示器以显示来自该扫描设备的信号。