Top/bottom pincushion correction circuit

Details Top/bottom pincushion correction circuit Top/bottom pincushion correction circuit

1993-09-10

1995-09-12

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

H01J 2956

Patent

active

054499828

ABSTRACT:
A pincushion correction circuit has a pair of units having a first and a second differential comparator circuit for sampling the upper portion and lower portion of a vertical sawtooth wave signal, respectively, a first and a second multiplier circuit for squaring outputs of the first and second differential comparator circuits, and a first and a second amplitude adjusting circuit, besides a conventional voltage/current converter, a multiplier and an amplifier circuit. The outputs of the two amplitude adjusting circuits are summed by an adder and supplied to the amplifier circuit; whereby top and bottom pincushion distortions are individually adjustable.

REFERENCES:
patent: 4395662 (1983-07-01), Sexton, Jr.
patent: 4501996 (1985-02-01), Yamaguchi
patent: 4518898 (1985-05-01), Tarnowski et al.
patent: 4642531 (1987-02-01), Jobling et al.
patent: 4692804 (1987-09-01), Aoki et al.
patent: 4795946 (1989-01-01), Nishiyama
patent: 4927219 (1990-05-01), Golik

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