Metal detector for control of access combined in an integrated f

Details Metal detector for control of access combined in an integrated f Metal detector for control of access combined in an integrated f

1995-05-04

1996-06-04

Swann, Glen

Communications: electrical

Condition responsive indicating system

Specific condition

324244, G08B 1324

Patent

active

055237398

ABSTRACT:
Metal mass detector (M.D.) operates on "foi" audio frequency transmissions provided in reception, with auxiliary circuitry for the processing of coded information signals, transmitted at "foi.+-..DELTA.f" (fo.sub.i =fo.sub.1, fo.sub.2 . . . fo.sub.n 1.ltoreq.i.ltoreq.n) adjacent to but not coinciding with the carrier frequencies of the transmission windings of the metal detector, combined with an active type, electronic transponder card with one or more windings forming a part of a high impedance circuitry for "foi" frequency signals.

REFERENCES:
patent: 3839709 (1974-10-01), Sugiura
patent: 3891980 (1975-06-01), Lewis et al.
patent: 4866424 (1989-09-01), Parks
patent: 5241298 (1993-08-01), Lian et al.

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