EAS SYSTEM EMPLOYING PSEUDORANDOM CODING SYSTEM AND METHOD

摘要

A system and method is provided for reducing noise interference in a way that employs pseudorandom coding. A transmitter and receiver are provided to send and receive a string of non-periodic pulses (10, 20). The string of non-periodic pulses (10, 20) can be a sequence of pseudorandom codes. The random transmission of pulses in a non-periodic manner promotes a significant immunity to periodic interferences of constant noise operating in a surveillance area. The string of non-periodic pulses can be mutually space and binary, in the form of 0 or 1, and can include several bits per cycle to measure the mean and standard deviation of the string of non-periodic pulses received. A circuit is coupled to the transmitter and receiver for comparing the portion of the string of non-periodic pulses received with the string of non-periodic pulses transmitted. An alarm (30) is triggered if the portion of the string of non-periodic pulses is above a threshold value.