Communications: electrical – Continuously variable indicating – With meter reading
Patent
1988-01-20
1990-06-19
Weldon, Ulysses
Communications: electrical
Continuously variable indicating
With meter reading
332109, 34082572, 341176, G08C 1900, H04B 900
Patent
active
049357360
ABSTRACT:
Apparatus and method for remotely controlling electrical loads having resistive or complex impedances. The apparatus features a controller having a transmitter and a companion receiver. The transmitter is preferably hand-held and includes a command generator at which commands are selected; a modulator responsive to the command signals for generating modulation signals containing the load control information; an oscillator responsive to the modulation signals for generation short-duration bursts of r.f. carrier whose positions in time convey the load control information; and an antenna for radiating the modulated, r.f. carrier. The receiver includes an antenna responsive to the transmitter; a detector responsive to the receiver antenna for generating signals corresponding to the transmitter modulation signals; a converter responsive to the detector signals for changing the detector signals to a form convenient for processing; a decoder responsive to the converter for generating load control signals; and a driver connected to the loads and responsive to the control signals for implementing the commands selected at the transmitter. The method includes steps for generating command signals including control data; generating short-duration modulation signals in response to the command signals; varying the amplitude of an r.f. carrier with the modulation signal to generate bursts of r.f. carrier having positions in time that convey the load control information and, thereafter, radiating the r.f. carrier. Additionally the method includes steps for receiving the modulated carrier; demodulating the carrier; converting the detector signal for processing; decoding the load control information; and generating load control signals for driving the loads.
REFERENCES:
patent: 3337992 (1967-08-01), Tolson
patent: 4027276 (1977-05-01), Shaughnessy
patent: 4072898 (1978-02-01), Hellman et al.
patent: 4143368 (1979-03-01), Route et al.
patent: 4251812 (1981-02-01), Okada et al.
patent: 4413261 (1983-11-01), Greenberg
patent: 4626848 (1986-12-01), Ehlers
Merit Electronic Design Co., Ltd.
Scifo Paul C.
Weldon Ulysses
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