Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1988-05-16
1989-05-16
Britton, Howard W.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358136, 375 27, H04N 7137
Patent
active
048314390
ABSTRACT:
In a DPCM video digital data communication system, each scan line of a video frame is refreshed with PCM data over a refresh cycle comprising a plurality of frames. Refresh generators at the transmitter and at the receiver are synchronized with an initialization signal and with subsequent refresh cycle synchronizing signals. Also the scan lines and frames are synchronized with corresponding transmitted marker synchronizing signals. The refresh generators run asynchronously between marker synchronizing signals to select scan lines for refresh. The refresh generators each employ counters for counting a selected number M which is an integer having no factors in common with the number of scan lines of a frame to select scan lines for refresh which have different spatial positions in adjacent successive frames to avoid generating visible refresh artifacts.
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Acampora Alfonse A.
Bunting Richard M.
Fedele Nicola J.
Waldman Harvey
Britton Howard W.
Davis Jr. James C.
General Electric Company
Squire William
Webb II Paul R.
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