Method and system for reducing effect of interference in integrated metal detection/electronic article surveillance systems

摘要

An integrated electronic article surveillance ("EAS")/metal detection system (10). The system (10) includes a transmitter (30) operable to transmit an EAS interrogation signal, where the EAS interrogation signal establishes an interrogation zone and is used to detect EAS markers and metal objects within the interrogation zone. The EAS interrogation signal is transmitted at a first frequency during an EAS detection cycle and at a second frequency during a metal detection cycle. The system (10) includes a receiver (34) operable to detect a signal received from an EAS marker, and a metal detector module (38) operable to detect a metal object in proximity to the integrated EAS/metal detection system (10), where the metal detector module (38) includes a filter (39) tuned to substantially filter out the first transmission frequency.