Leroy A Booker

US Patent:

53493320, Sep 20, 1994

Filed:

Oct 13, 1992

Appl. No.:

7/959685

Inventors:

David B. Ferguson - Delary Beach FL
LeRoy A. Booker - Pompano Beach FL
Craig R. Szklany - Boyton Beach FL

Assignee:

Sensormatic Electronics Corportion - Deerfield Beach FL

International Classification:

G08B 13187

US Classification:

340572

Abstract:

An EAS system in which a transmitter transmits an RF transmitter signal into an interrogation zone and a receiver receives RF signals from the interrogation zone. The received RF signals include any RF tag signals generated by tags situated in the zone and adapted to respond to the RF transmitter signal. In order to reduce interference effects, the RF carrier frequency of the transmitter signal is adapted to take on a plurality of different frequency values during different ones of a plurality of finite dwell time periods of the RF transmitter signal.