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    • 6. 发明授权
    • Electronic article security system employing variable time shifts
    • 采用可变时间偏移的电子物品安全系统
    • US06249229B1
    • 2001-06-19
    • US09374655
    • 1999-08-16
    • Eric EcksteinJohn DaviesEdwin HoptonNimesh ShahBent Svendsen
    • Eric EcksteinJohn DaviesEdwin HoptonNimesh ShahBent Svendsen
    • G08B1314
    • G08B13/2482G08B13/2488
    • 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.
    • 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。
    • 9. 发明授权
    • Radio frequency detection and identification system
    • 射频检测识别系统
    • US07187289B2
    • 2007-03-06
    • US11123736
    • 2005-05-06
    • Eric EcksteinJohn D. ParanzinoNimesh Shah
    • Eric EcksteinJohn D. ParanzinoNimesh Shah
    • G08B13/14
    • G08B13/2414G08B13/2417G08B13/2431G08B13/2448G08B13/2482G08B13/2488
    • A system is disclosed for detecting the presence of an article. The system includes a transmitter for radiating a first electromagnetic signal at a predetermined primary frequency and a resonant tag secured to the article. The resonant tag generates a second electromagnetic signal in response to receiving the first electromagnetic signal. The second electromagnetic signal has components at the primary frequency and at a predetermined secondary frequency different from the primary frequency. The system also includes a receiver for receiving the second electromagnetic signal and a computer connected to an output of the receiver. The computer processes the received second electromagnetic signal and generates an output signal when the secondary frequency is detected in the second electromagnetic signal.
    • 公开了一种用于检测物品的存在的系统。 该系统包括用于以预定主频率辐射第一电磁信号的发射器和固定到物品的谐振标签。 响应于接收到第一电磁信号,谐振标签产生第二电磁信号。 第二电磁信号具有主频率和与主频率不同的预定次频的分量。 该系统还包括用于接收第二电磁信号的接收器和连接到接收器的输出的计算机。 当在第二电磁信号中检测到次频时,计算机处理所接收的第二电磁信号并产生输出信号。