Inductive loop detector with automatic frequency change

Details Inductive loop detector with automatic frequency change Inductive loop detector with automatic frequency change

2008-01-29

2008-01-29

Lee, Benjamin C. (Department: 2612)

Communications: electrical

Vehicle detectors

C340S941000, C340S551000, C324S200000, C324S207150

Reexamination Certificate

active

07324014

ABSTRACT:
A system and method is disclosed to the elimination of cross talk between inductive loop detector units in a security system. The system includes appropriate devices for assigning different operational frequencies of each loop detector circuit to avoid cross talk. In a further aspect it provides a system and method for determining actual operational frequencies of various loop detector circuits in a security system and for changing the resonant frequencies to eliminate cross talk.

REFERENCES:
patent: 3943339 (1976-03-01), Koerner et al.
patent: 6380868 (2002-04-01), Hilliard et al.
patent: 7132959 (2006-11-01), Seabury et al.
patent: 0 419 273 (1991-03-01), None
patent: 2 138 613 (1984-10-01), None
patent: 2 149 952 (1985-06-01), None
patent: 04346088 (1992-12-01), None
English Abstract for Japanese Patent JP60064287A, Apr. 12, 1985.
British Search Report for British Patent Application No. GB0405297.3 dated Jul. 26, 2004.

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