Pattern-comparing security tag detection system

Details Pattern-comparing security tag detection system Pattern-comparing security tag detection system

1984-09-07

1987-05-05

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

340551, G08B 1318

Patent

active

046636129

ABSTRACT:
Security apparatus for detection of a security tag to be hidden in an article to be detected. The digitized waveshape of a tag signature signal preferably obtained by distortion of an oscillating magnetic field, (whereby the distortion signal being detected constitutes a signature signal) is compared with a stored digital representative of a signature signal, and an alarm enable signal is generating in the event of correlation a predetermined number of times in a predetermined time period. The stored signal is modified by the specific factors. The characteristics of the apparatus and of environmental factors. The result is a reliable detection apparatus with a very low false alarm rate.

REFERENCES:
patent: 4382291 (1983-05-01), Nakauchi
patent: 4476459 (1984-10-01), Cooper et al.
patent: 4539558 (1985-09-01), Fearon

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