Twisting distortion correcting circuitry

Details Twisting distortion correcting circuitry Twisting distortion correcting circuitry

1974-06-10

1976-05-25

Wilbur, Maynard

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315387, H01J 2956

Patent

active

039596893

ABSTRACT:
A twisting distortion correcting circuit to remove the twisting distortion in a picture on a television receiver in such a way that beam current of the television receiver is detected, and the high frequency components and the d.c. components in the detected beam current are removed so as to obtain a voltage wave form analogous to the mean horizontal deflection current wave form, and then the voltage wave form obtained is fed to the horizontal oscillation circuit whose oscillating frequency is controlled by the output voltage of the AFC circuit, whereby the twisting distortion of the picture is corrected by producing the twisting distortion opposite to that of picture caused by a substantial variation of the beam current.

REFERENCES:
patent: 2574946 (1951-11-01), White
patent: 2829303 (1958-04-01), Knechtli

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