using passive elements, e.g. diodes

Full Title

Scanning details of television systems; Combination thereof with generation of supply voltages > by means not exclusively optical-mechanical (H04N3/36 takes precedence) > by deflecting electron beam in cathode-ray tube > Circuits for controlling dimensions, shape or centering of picture on screen > Distortion correction, e.g. for pincushion distortion correction, S-correction > using passive elements, e.g. diodes