EAS system with requency hopping

Details EAS system with requency hopping EAS system with requency hopping

1992-10-13

1994-09-20

Swann, Glen

Communications: electrical

Condition responsive indicating system

Specific condition

340551, G08B 13187

Patent

active

053493320

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.

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patent: 4352098 (1982-09-01), Stephen et al.
patent: 4356477 (1982-10-01), Vandebult
patent: 4429302 (1984-01-01), Vandebult
patent: 4642640 (1987-02-01), Woolsey et al.
patent: 4736207 (1988-04-01), Siikarla et al.
patent: 5109217 (1992-04-01), Siikarla et al.
Schilling, Donald L. et al., "Spread Spectrum Goes Commercial" IEEE Spectrum, Aug. 1990.

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