Patent ID: 6351216
Filing Date: 2002-02-26
Classification: G08B

Abstract:
An electronic article surveillance (EAS) receiver, comprising:primary antenna means for receiving a first signal comprising an EAS tag signal and an interference noise signal, said primary antenna means coupled to a primary channel means for amplifying and filtering said first signal; reference antenna means for receiving a second signal comprising said interference noise signal, said reference antenna means coupled to a reference channel means for amplifying and filtering said second signal; an adaptive filter connected to said reference channel means, said adaptive filter responsive to an update algorithm including means for updating said adaptive filter, an output of said adaptive filter being approximately equal to said interference noise signal; and, summing means, connected to said adaptive filter and to said primary channel means, for subtracting the output of said adaptive filter from an output of said primary channel means, wherein an output of said summing means is approximately equal to said EAS tag signal.