Communications: electrical – Continuously variable indicating – With meter reading
Patent
1996-10-15
1999-09-28
Horabik, Michael
Communications: electrical
Continuously variable indicating
With meter reading
375200, 375201, 455 46, 34087003, 34087018, G08B 2300
Patent
active
059595507
ABSTRACT:
A remote meter reading system uses transponders adapted to transmit a spread spectrum signal which is generated by frequency modulating data with a carrier signal. The resulting output signal is then spread by phase modulating with a pseudo-random code signal before transmission with the carrier suppressed. At the receiver, the original suppressed carrier is regenerated by squaring a first IF signal and then applying the output signal to a narrow band receiver from which the data can be recovered with a conventional FM discriminator.
REFERENCES:
patent: 5438329 (1995-08-01), Gastouniotis
patent: 5448229 (1995-09-01), Lee
patent: 5459459 (1995-10-01), Lee
patent: 5477216 (1995-12-01), Lee
patent: 5541589 (1996-07-01), Delaney
Horabik Michael
Ramar Technology Ltd.
Wong Albert K.
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