Patent ID: 6249229
Filing Date: 2001-06-19
Classification: G08B

Abstract:
A pulse-listen electronic article security (EAS) system for detecting the presence of a security tag within a detection zone comprising:a transmitter for radiating a first electromagnetic signal into the detection zone, the first electromagnetic signal being a time sequence of RF bursts emitted during each of a plurality of contiguous frame intervals, a duration of each of the frame intervals being one of a plurality of different values; anda 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 and providing an output signal if a security tag is detected, wherein 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.