Variable picture size circuit for a television receiver

Details Variable picture size circuit for a television receiver Variable picture size circuit for a television receiver

1983-09-22

1985-10-15

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315411, 358180, H01J 2956

Patent

active

045477086

ABSTRACT:
A horizontal deflection circuit periodically applies a horizontal trace voltage to a horizontal deflection winding for generating horizontal scanning current therein. A modulator circuit is responsive to control signals for varying the horizontal trace voltage to develop concurrent variations in the amplitude of the horizontal scanning current. A side pincushion control signal is applied to the modulator circuit to vary the horizontal trace voltage at a vertical rate for developing variations in the amplitude of the horizontal scanning current that produce side pincushion correction. A horizontal size control signal is applied to the modulator circuit to vary the horizontal trace voltage for changing the picture size in the horizontal direction. A vertical deflection circuit generates in a vertical deflection winding a vertical scanning current having an amplitude that varies with variations in a vertical size control signal for changing the picture size in the vertical direction.

REFERENCES:
patent: 3097262 (1963-07-01), Ehrenhaft
patent: 3235767 (1966-02-01), Bahring
patent: 3713000 (1973-01-01), Driskell et al.
patent: 3908083 (1975-09-01), Hiraki et al.
patent: 4028726 (1977-06-01), Argy

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