Digital horizontal processor

Details Digital horizontal processor Digital horizontal processor

1987-05-01

1988-04-19

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358150, H04N 514

Patent

active

047394030

ABSTRACT:
A digital horizontal processor includes a first counter initiated by a horizontal sync pulse for determining a first time interval. When the first counter overflows, it initiates counting in a second counter and in a third counter and initiates a horizontal drive pulse. A feedback pulse is developed at the center of retrace of the video. A latch is coupled between the first and second counters. A reset pulse periodically enables a flip flop to generate, upon occurrence of the feedback pulse, a correction signal to operate the latch to load the count of the second counter into the first counter as a preset. The overall time from horizontal sync to center of retrace is held constant.

REFERENCES:
patent: 3781470 (1973-12-01), Horn
patent: 3891800 (1975-06-01), Janssen et al.
patent: 4351001 (1982-09-01), McGinn

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