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1. 发明授权

US4635041A Theft protection system particularly for shop areas 失效
标题翻译：防盗系统特别适用于店面
公开(公告)号：US4635041A
公开(公告)日：1987-01-06
申请号：US690497
申请日：1984-12-10
申请人： Mogens Maimann , Bent Svendsen
发明人： Mogens Maimann , Bent Svendsen
IPC分类号： G08B13/24
CPC分类号： G08B13/2488
摘要： In a theft protection system, particularly for a shop area, several exit passages with individual antenna systems are surveyed by means of a single transmitter for the transmission of electromagnetic interrogation signals and a single receiver for reception of resonance signals generated by unauthorized removal of a good, the antenna system for all the exit passages being connected to the transmitter and the receiver through multiplexers. A central control unit controls the multiplexers so as to actuate the antenna systems in successive time frames, whereby only one antenna system is made operative at a time. With each exit passage is associated an alarm device which is only activated for an alarm release from an alarm-actuating circuit connected to the control unit in case of compliance with at least one positive and one negative alarm criterion.
摘要翻译： PCT No.PCT / DK84 / 00027 Sec。 371日期1984年12月11日第 102（e）日期1984年12月11日PCT提交1984年4月10日PCT公布。出版物WO84 / 04191 日期为1984年10月25日。在防盗系统中，特别是对于商店区域，具有单个天线系统的几个出口通道通过用于传输电磁询问信号的单个发射器和用于接收谐振信号的单个接收器进行测量通过未经授权的拆卸而产生的，用于所有出口通道的天线系统通过多路复用器连接到发射机和接收机。中央控制单元控制多路复用器以便在连续的时间帧内致动天线系统，由此一次只能操作一个天线系统。每个出口通道相关联的报警装置仅在符合至少一个正和负的报警标准的情况下才被激活用于从连接到控制单元的报警启动电路的报警释放。

2. 发明授权

US06249229B1 Electronic article security system employing variable time shifts 有权
标题翻译：采用可变时间偏移的电子物品安全系统
公开(公告)号：US06249229B1
公开(公告)日：2001-06-19
申请号：US09374655
申请日：1999-08-16
申请人： Eric Eckstein , John Davies , Edwin Hopton , Nimesh Shah , Bent Svendsen
发明人： Eric Eckstein , John Davies , Edwin Hopton , Nimesh Shah , Bent Svendsen
IPC分类号： G08B1314
CPC分类号： G08B13/2482 , G08B13/2488
摘要： A pulse-listen electronic article security (EAS) system for detecting the presence of a security tag within a detection zone is disclosed. The EAS system includes a transmitter for radiating a first electromagnetic signal into the detection zone. The first electromagnetic signal is a time sequence of RF bursts emitted during each of a plurality of contiguous frame intervals in which the duration of each of the frame intervals is one of a plurality of different values. The EAS system also includes a receiver synchronized with the transmitter for receiving a second electromagnetic signal re-radiated from a security tag in the detection zone in response to the first electromagnetic signal. The receiver provides an output signal if a security tag is detected. The values of the plurality of the frame interval durations are selected to be different from the values of frame interval durations of other EAS systems thereby rendering the EAS system substantially free of false alarms or blockages caused by the operation of other EAS systems.
摘要翻译：公开了一种用于检测检测区内的安全标签的存在的脉冲收听电子物品安全（EAS）系统。 EAS系统包括用于将第一电磁信号辐射到检测区域的发射器。第一电磁信号是在多个相邻帧间隔中的每一个期间发射的RF突发的时间序列，其中每个帧间隔的持续时间是多个不同值之一。 EAS系统还包括与发射机同步的接收机，用于响应于第一电磁信号接收从检测区域中的安全标签重新辐射的第二电磁信号。如果检测到安全标签，则接收器提供输出信号。多个帧间隔持续时间的值被选择为与其他EAS系统的帧间隔持续时间的值不同，从而使EAS系统基本上没有由其他EAS系统的操作引起的假警报或阻塞。

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