Communications: electrical – Continuously variable indicating – With meter reading
Patent
1994-01-19
1996-04-02
Zimmerman, Brian
Communications: electrical
Continuously variable indicating
With meter reading
34082536, 34082573, 34082547, 455343, 345141, H04Q 100
Patent
active
055044751
ABSTRACT:
A system comprises a central unit and a plurality of display modules each adapted to show on a display information received from the central unit, for example for displaying prices in a store. The central unit comprises a transmitter including a current loop fed with a low-frequency signal modulated according to the information to be transmitted and the system comprises, associated with each display module or group of display modules, a receive circuit, a receive antenna coupled electromagnetically to said current loop and a device for activating the receive circuit at predetermined periods for a limited duration. Each transmission of information by the central unit is preceded by the transmission of a reactivation signal which, when detected by the receive circuit during a phase in which the latter is active, causes it to be held in the active state for at least part of the duration for which said information is transmitted.
REFERENCES:
patent: 3739339 (1973-06-01), Hillhouse et al.
patent: 4002886 (1977-01-01), Sundelin
patent: 4449248 (1984-05-01), Leslie
patent: 4500880 (1985-02-01), Gomersall et al.
patent: 4523332 (1985-06-01), Mori
patent: 4821291 (1989-04-01), Stevens et al.
patent: 4857917 (1989-08-01), Sato
patent: 4996526 (1991-02-01), Deluca
patent: 5089813 (1992-02-01), Deluca et al.
patent: 5111196 (1992-05-01), Hunt
"Modern Digital and Analog Communications Systems" B. P. Lathi 1983 pp. 180, 181, 256-261.
Houdou Michel
Morineau Jacques
Sitour Electronic Systems
Zimmerman Brian
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