VIDEO SIGNAL PROCESSING

High-definition video signal are produced using processing equipment incorporating a unit with two vertical-aperture circuits and and an interpolator, the former taking the signals A and C, passing them through a summation amplifier and a divide-by-two invertor. After combining this signal with B at the summation amplifier, the output signal .DELTA.B (which represents the vertical detail signal of B as compared to the signals A and C) is passed through a noise-coring circuit and any resulting output output added to B at the summation amplifier to produce a signal B* with enhanced vertical detail. Then signals B* and C* are averaged and alternately connected to the output of the unit, thereby to produce a high-definition video signal.