DIGITAL VERTICAL BEAM LANDING CORRECTION CIRCUIT

摘要

Circuitry corrects vertical beam landing errors for color cathode ray tubes. A digital delay circuit provides horizontal scan line video pixel information at its proper location to produce a distortion corrected raster. Accurate correction is provided by a combination of scan line offset between the input and output video signals and by sample interpolation techniques that effectively form derived pixels that have an apparent location that corrects the scanning distortions. The location of the derived pixel relative to the video pixel samples is determined by the selection of the interpolating coefficients.