Top and bottom pincushion distortions correcting circuits to be

Details Top and bottom pincushion distortions correcting circuits to be Top and bottom pincushion distortions correcting circuits to be

1987-12-04

1989-03-07

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

H01J 2956

Patent

active

048109398

ABSTRACT:
A top and bottom pincushion distortions correcting circuit suitable for a television receiver using a picture tube having the face plate of aspherical surface. This distortion correcting circuit comprises an adder circuit which adds a parabolic signal of horizontal cycle and a sine wave signal of horizontal cycle with adequate mixture rate and a waveform shaper which converts a saw wave signal of vertical cycle to an S-shaped wave signal. A combining signal obtained from the adder circuit is modulated by the S-shaped wave signal in the balanced modulator. The top and bottom pincushion distortions of raster are corrected by the modulated combining signal. The combining signal corrects pincushion distortions of the top and bottom scanning lines of raster and the S-shaped wave signal is used for correcting the pincushion distortion of internal raster.

REFERENCES:
patent: 4496882 (1985-01-01), Oliver et al.

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