Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1988-05-16
1989-12-19
Britton, Howard W.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358136, 375 27, H04N 737
Patent
active
048886408
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 then run asynchronously to select scan lines for refresh. The refresh generators each employ counters for counting a selected number M, which has no factors in common with the number of scan lines of a frame, to select scan lines for refresh which have respectively different spatial positions in adjacent frames to avoid generating visible refresh artifacts. The number of frames in a refresh cycle is adaptively changed to stabilize the fill of the transmitter rate buffer.
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Acampora Alfonse A.
Bunting Richard M.
Britton Howard W.
Davis Jr. James C.
General Electric Company
Squire William
Webb II Paul R.
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