Facsimile and static presentation processing – Facsimile – Recording apparatus
Patent
1981-08-25
1983-08-09
Griffin, Robert L.
Facsimile and static presentation processing
Facsimile
Recording apparatus
358264, 358213, 358294, H04H 140
Patent
active
043982212
ABSTRACT:
A horizontal scan sync signal is generated at every predetermined time interval allowing for a time period necessary for one line of video data to be stored in a RAM. In response to the horizontal scan sync signal, a video signal is transferred in parallel to a shift register inside a solid scanning element. When a microprocessor or CPU has failed to take in video data within a predetermined period of time after the appearance of the horizontal scan sync signal, shift clock pulses are forcibly generated so that a video signal is coupled from the solid scanning element to a binary circuit.
The interval between successive horizontal sync signals, in response to which the CPU takes in each line of video data, may be made relatively short to schedule artificial periods in which the CPU does not take in any video data. By utilizing such a specific period, the components of a video signal output of the solid scanning element which appear within a given period can be processed to prepare a threshold value.
REFERENCES:
patent: 3499975 (1970-03-01), Arps
patent: 3622695 (1971-11-01), Rugaber
patent: 4296440 (1981-10-01), Rosenheck
patent: 4297727 (1981-10-01), Ogawa et al.
Alexander David G.
Coles Edward L.
Griffin Robert L.
Ricoh & Company, Ltd.
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