Telegraphy – Systems – Simplex-reversing periodic
Patent
1974-12-23
1976-10-05
Griffin, Robert L.
Telegraphy
Systems
Simplex-reversing periodic
178 72, 178 76, 178 77, 178DIG12, 178DIG27, 178DIG29, H04N 314
Patent
active
039846296
ABSTRACT:
A flying spot scanner is disclosed for scanning an object document or scene with a spot of light, and producing an electrical video signal representing the object. The scanner can be operated under normal ambient light conditions without a light-shielding enclosure. A light beam is deflected in repetitive scanning fashion over the object. The light beam is modulated in amplitude (intensity) at a radio frequency f.sub.c such as 1.2 MHz. A photodetector is positioned to receive light from the object, and it produces an unwanted electrical ambient light noise signal having a maximum frequency f.sub.a, and an electrical information signal consisting of a carrier at frequency f.sub.c modulated by a video signal having a maximum frequency f.sub.m, where f.sub.c - f.sub.m is larger than f.sub.a. The information signal is separated from the ambient light noise signal by a filter, and the information signal is demodulated to produce a facsimile or video information signal free of noise due to ambient light.
REFERENCES:
patent: 2476698 (1949-07-01), Clapp
patent: 2982816 (1961-05-01), Griengl
patent: 3003026 (1961-10-01), Astheimer
patent: 3230292 (1966-01-01), Routh
patent: 3830972 (1974-08-01), Siverling
Coles Edward L.
Griffin Robert L.
Norton Edward J.
Olson Carl V.
RCA Corporation
LandOfFree
Flying spot scanner unaffected by ambient light does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Flying spot scanner unaffected by ambient light, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Flying spot scanner unaffected by ambient light will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-656395