CIRCUIT FOR EAST-WEST PIN-CUSTION DISTORTION CORRECTION IN A VIDEO-FREQUENCY RECEIVER

摘要

1. Circuit for correcting the East-West cushion distortion of an image reproduced on the screen of a television tube, comprising a correction capacitor (Cc ), a correction inductance (Tc ) which is serially connected to the horizontal deviation coil (Ld ), and a switch (3) which is controlled so as to influence the value of said inductance (Tc ), the control being effected by a circuit comprising a phase modulator (2), the input of which is connected to a generator (1) of parabolic signals at the image frequency and to a feedback branch (PB ) injecting a signal representing the deviation coil current back into the input of the modulator (2), characterized in that the correction capacitor (Cc ) being disposed such that the voltage at its terminals represents the current intensity in the deviation coil (Ld ), one of the capacitor terminals is connected to a constant potential and the other therminal is directly connected to the feedback input.