Video compensation subcircuit

Details Video compensation subcircuit Video compensation subcircuit

1980-03-10

1982-02-02

Waring, Alvin H.

Communications: electrical

Visual indication

Movable

358148, 358183, 340744, G06F 314

Patent

active

043142451

ABSTRACT:
A video compensation subcircuit which solves a problem encountered with many inexpensive video monitors having very high frequency video input signals, namely that horizontal lines on the monitor's screen appear much brighter than the vertical lines. The subcircuit solves the problem by attenuating the video signal whenever the signal is developing a horizontal line, thus balancing the intensity of horizontal and vertical lines as they appear on the screen. The hardware of the subcircuit includes a "D" type flip-flop which delays the incoming video signal for one clock pulse so that the delayed signal and the video signal can be compared to see if a horizontal line is being developed on the monitor's screen. If a horizontal line is being developed a subtraction signal is produced which subtracts from a pulsed version of the video signal to produce a compensated video output signal.

REFERENCES:
patent: 3986186 (1976-10-01), Cochran
patent: 4228433 (1980-10-01), Matsumoto

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