发明名称 |
Pattern-comparing security tag detection system |
摘要 |
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.
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申请公布号 |
US4663612(A) |
申请公布日期 |
1987.05.05 |
申请号 |
US19840648111 |
申请日期 |
1984.09.07 |
申请人 |
SIGMA SECURITY INC. |
发明人 |
MEJIA, EZEQUIEL;TAILLEFER, PIERRE;NGUYEN, PHUC |
分类号 |
G01V3/10;G08B13/24;(IPC1-7):G08B13/18 |
主分类号 |
G01V3/10 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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