Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Patent
1979-01-29
1982-01-26
Bookbinder, Marc E.
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
455608, 340709, 340711, H04B 900
Patent
active
043132278
ABSTRACT:
A light energy information transmission system for transmitting digital coded information as a modulated light signal. The light energy information transmission system is preferably comprised of four remote control units each of which transmits a series of amplitude modulated infrared information pulses at a discrete frequency and a single receiver module for demodulating the information pulses received from each control unit and for transmitting the information carried thereby to a computing system. Each portable control unit includes a digital joystick which is movable in any direction in an X-Y plane and a keyboard having a plurality of keyswitches for selectively inputting the information to be transmitted. The information is then encoded as a 12-bit data word, and transmitted as a series of amplitude modulated infrared pulses which are detected by the receiver module. The infrared pulses are reconverted to electrical pulses, demodulated and transmitted to the computing system. Each control unit has a channel selector for selecting a discrete carrier frequency to identify the particular control unit and the receiver module includes a switching circuit, automatically controlled by a digital processor, for selectively tuning the receiver to receive information from each control unit separately in a predetermined sequence.
REFERENCES:
patent: 4045777 (1977-08-01), Mierzwinski et al.
patent: 4111421 (1978-09-01), Mierzwinski
patent: 4150284 (1979-04-01), Trenkler et al.
Bookbinder Marc E.
Coles Edward L.
Heiting Leo N.
Merrett N. Rhys
Sharp Melvin
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