Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Patent
1988-03-21
1990-05-01
Griffin, Robert L.
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
350276R, 455603, 340905, H04B 900
Patent
active
049214683
ABSTRACT:
An optical communication system suited for transmitting optical signals to a moving station located on a vehicle comprises a transmitting station to send out coded optical pulse signals through space and a receiving station to receive the pulse signals. The transmitting station comprises a data input device, a signal encoder to convert the data into coded signals, an optical pulse signal generator to deliver the coded optical pulse signals, and a transmitting path setter to set a space path for transmitting the optical pulse signals. The receiving station comprises a receiving device for receiving the optical pulse signals transmitted from the transmitting station, a signal decoder to decode the optical pulse signals into coded signals, and a data display to represent the data in visible form based on the coded signals. The transmitting device may provided with an external light shade for preventing the receiving surface of the receiving device from external lights.
REFERENCES:
patent: 3431504 (1969-03-01), Adler
patent: 3857630 (1974-12-01), Gonzalez
patent: 3876308 (1975-04-01), Alpers
patent: 4307294 (1981-12-01), Campbell
Aisin Seiki Kabushiki Kaisha
Beek L. Van
Griffin Robert L.
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