Vertical drive generator and horizontal rate gate generator for

Details Vertical drive generator and horizontal rate gate generator for Vertical drive generator and horizontal rate gate generator for

1980-12-22

1982-11-23

Murray, Richard

Facsimile and static presentation processing

Static presentation processing

Attribute control

358150, 358176, H04N 946, H04N 506

Patent

active

043608256

ABSTRACT:
A vertical drive generator and a horizontal gating generator are described which time-share circuitry common to both generators to provide vertical drive pulses and horizontal gating pulses for use in a television receiver. The vertical drive generator converts variable width vertical rate pulses to constant width vertical drive pulses in a manner such that the duration of each drive pulse is determined by a digital counter. In the interval between the generation of successive vertical drive pulses, the counter is reset to provide timing control for the gating generator. In the preferred embodiment, the latter generator develops AGC gating pulses and burst gating pulses at selected times and for selected durations.

REFERENCES:
patent: 3777063 (1973-12-01), Meacham
patent: 4149179 (1979-04-01), Wilcox

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