Digital signal processor for electronic article gates

Details Digital signal processor for electronic article gates Digital signal processor for electronic article gates

1990-01-02

1991-06-11

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

G08B 1318

Patent

active

050235982

ABSTRACT:
A frequency-swept electromagnetic field is generated in an interrogation zone and signals received from the interrogation zone are processed to detect the presence of a marker with a resonant tank circuit in the zone. Detection is achieved by the use of averaging techniques of a plurality of sweeps wherein peaks above a defined level are stored in a persistence table. A symmetry test is made on the peaks and if the peaks are persistence and symmetrical the presence of a marker is indicated since background noise will not exhibit persistence and symmetry.

REFERENCES:
patent: 4168496 (1979-09-01), Lichtblau
patent: 4812822 (1989-03-01), Feltz et al.
patent: 4859991 (1989-08-01), Watkins et al.
patent: 4888579 (1989-12-01), ReMine et al.

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