Pattern-comparing security tag detection system
US4663612A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 7, 1984 |
| Grant date | May 5, 1987 |
| Priority date | — |
| Expiry date | Sep 7, 2004 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08B13/2445
- WIPO fieldControl
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.