Surveillance system including transmitter and receiver synchroni

Details Surveillance system including transmitter and receiver synchroni Surveillance system including transmitter and receiver synchroni

1985-09-17

1987-04-14

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

340572, G08B 1324

Patent

active

046582410

ABSTRACT:
An article surveillance system includes a structure responsive to a first pulsed inductive magnetic field, periodically derived by a power line activated generator. The structure derives a second pulsed inductive magnetic field having a predetermined occurrence time relative to the occurrence time of the first magnetic field. A receiver for the second magnetic field is power line activated. The occurrence time of the first magnetic field and the activation time of the receiver to be responsive to the second magnetic field are synchronized. The synchronization of the transmitter and receiver is provided by separate zero crossing detectors for the power lines respectively activating the transmitter and receiver. The power lines activating the transmitter and receiver are likely to have zero crossings at different predetermined time positions because they are likely to be across two different phases of a three-phase power line. The receiver and transmitter includes separate circuits for compensating for the different zero crossing time positions.

REFERENCES:
patent: 4274090 (1981-06-01), Cooper
patent: 4384281 (1983-05-01), Cooper
patent: 4476459 (1984-10-01), Cooper et al.
patent: 4531117 (1985-07-01), Nourse et al.
patent: 4565996 (1986-01-01), Close

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