Patent
A multi-frequency resonant tag circuit for use with an electronic security system having improved noise discrimination
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TLDR
In this article, a multi-frequency resonant tag circuit with distinct frequencies for detection and discrimination was used in a controlled area such as a retail store and employing a multiuser noise rejection circuitry.Abstract:
An electronic security system adapted for use in a controlled area such as a retail store and employing a multi-frequency resonant tag circuit having distinct frequencies for detection and discrimination. An electromagnetic field is provided within the controlled area at a frequency which is swept through a range including the detection frequency of the resonant tag circuit. In the presence of a tag circuit within the controlled area, pulses are detected by a receiver which includes noise rejection circuitry for discriminating true signals from noise. The noise rejection circuitry is sensitive to expected signals and operative to discriminate true signals from noise on the basis of several different criteria, resulting in substantially reduced false alarm actuation.read more
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Patent
Electronic security system
TL;DR: In this paper, a multi-frequency resonant tag circuit is used for detecting and deactivating a retailer's electronic security system in a retail store, where the tag includes a fusible link integrally formed as part of the circuit and can be fused upon application of an electromagnetic field of predetermined magnitude at the deactivation frequency of the resonant circuit.