Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Patent
1978-08-10
1980-09-16
Griffin, Robert L.
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
358113, 3581941, 350311, H04B 900, H04N 533, H04N 544, G02B 520
Patent
active
042228808
ABSTRACT:
An arrangement or device for optical transmission of communications including a light transmitter with an associated receiver characterized by the receiver having a light collecting body having an index of refraction greater than 1 and containing fluorescent materials which absorb the band of light emitted by the transmitter and create a band of light which is not absorbed by the substance and is detected by the receiver. If more than one transmitter is utilized, they are arranged to transmit in different frequency bands and each transmitter has an associated fluorescent substance which will absorb the discrete separate frequency but not the other frequency bands and emit a fluorescent signal which is only detected by the respective receiver for that transmitter. These fluorescent substances can be in separate light collecting bodies or as a mixture in a single body which has more than one receiver attached thereto.
REFERENCES:
patent: 3426212 (1969-02-01), Klaas
patent: 3927316 (1975-12-01), Citta
patent: 3928760 (1975-12-01), Isoda
patent: 3937949 (1976-02-01), Ishikawa et al.
patent: 3959655 (1976-05-01), Mauer
patent: 4135202 (1979-01-01), Cutler
"Fluorescent Concentrator for Solar Energy Collection" Research Disclosure, Jan. 1975, pp. 20-21. _
Hans-Joachim Griese, "Audio auf Infrarot" Radio Mentor 42 (1976), pp. 440-442. _
"Bright and Economical" Elektronik-Zeitung, 3-25-77. _
W. Greubel and G. Baur, "The Fluorescence-Activated Display `FLAD`", Elektronik, 1977, Heft 6, pp. 55-56. _
Baur Guenter
Greubel Waldemar
Knauer Rudolf
Krueger Hans
Coles Edward L.
Griffin Robert L.
Siemens Aktiengesellschaft
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