Telegraphy – Systems – Simplex-reversing periodic
Patent
1974-03-08
1976-05-04
Griffin, Robert L.
Telegraphy
Systems
Simplex-reversing periodic
178 76, 178DIG3, H04N 112, H04N 712
Patent
active
039550451
ABSTRACT:
In a facsimile transmission system, a transmitter comprises a read photodetector which scans a document for video content and a lead photodetector which scans the document in advance of the read photodetector. The output of the read photodetector is coupled to a modulator which generates signals for transmission to a facsimile receiver at a remote location. The output of the read photodetector and the lead photodetector are also coupled to timing circuitry which automatically initiates a fast scanning mode for the read and lead photodetectors after a predetermined time lapse without detection of a dark, information-bearing area on the document. The facsimile receiver which comprises a stylus for scanning a copy medium and a demodulator for controlling marking on the copy medium by the stylus also includes timing circuitry for automatically initiating a fast scanning mode after a predetermined lapse in time between received signals representing dark, information-bearing areas. The fast scanning modes at the transmitter and receiver are terminated in response to the first dark, information-bearing area detected by the read or lead photodetector.
REFERENCES:
patent: 3670099 (1972-06-01), Oliver
Coles Edward L.
Exxon Research and Engineering Company
Griffin Robert L.
Norris N.
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