System for remote, interactive communication with a metal under

Details System for remote, interactive communication with a metal under System for remote, interactive communication with a metal under

1988-05-11

1989-09-19

Griffin, Robert L.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

34087002, 34087028, 455603, 455608, H04B 900

Patent

active

048688932

ABSTRACT:
Apparatus for transmitting meter data in serial form by IR emissions to a remote, hand-held communicator having a front-end detector circuit including a photodiode responding to the meter data and dissipating a d.c. term occasioned by indirect ambient illumination of the photodiode in the IR region. Corresponding control communication from the communicator to the meter is provided by IR emissions directed from an emitter of narrow beam angle to a wider angle receiving photodiode mounted with the meter at a location shielding it from direct sun illumination emanating above a horizontal plane extending from the immediate region of the photoresponsive receiver. Higher data transmission rates of 19.2 Kbaud are available in conjunction with an FSK transmission approach employing two channels.

REFERENCES:
patent: 4037219 (1977-07-01), Lewis
patent: 4091273 (1978-05-01), Fuller
patent: 4213119 (1980-07-01), Ward et al.
patent: 4281325 (1981-07-01), Jarva
patent: 4398172 (1983-08-01), Carroll
patent: 4426662 (1989-01-01), Skerlas
patent: 4641374 (1987-02-01), Oyama
patent: 4646084 (1987-02-01), Burrows
patent: 4680704 (1987-07-01), Konicek
patent: 4684248 (1987-08-01), Cinzori

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