Abstract: Disclosed is a cathode ray tube (CRT) character generator system which includes delay apparatus for storing digitally generated raster control signals. Raster control signals thus stored are combined with more recent raster control signals in an analog fashion in order to generate a composite, or interpolated, raster control signal which is resolved in horizontal time increments of finer resolution than that obtainable from the original digitally generated raster control signal. Raster control signals of prior horizontal scan lines are also compared with those of more recent horizontal scan lines in order to detect the steepness of the slope, if any, along the edges of the character to be displayed. A rise-time control signal is generated to control the rise and fall times of the interpolated raster control signal in proportion to this detected slope.

Abstract: A voltage controlled, active variable delay circuit for pulse signals, and a video signal time base corrector incorporating that variable delay circuit. The variable delay circuit includes a cascaded chain of electronic inverters, each of which has a propagation delay time dependent upon the level of an applied control voltage, and a pulse shaping circuit which regenerates substantially the input pulse waveform.