APPARATUS FOR EXTRACTING A VERTICAL SYNCHRONIZING PULSE FROM A COMPOSITE SYNCHRONIZING SIGNAL UDED IN A VIDEO SIGNAL

摘要

An apparatus for extracting a vertical synchronizing pulse from a composite synchronizing signal which comprises a device for regenerating a vertical synchronizing pulse in a continuous form by equally broadening the width of the respective input pulses to an extent at least larger than the width of the respective splits by which the vertical synchronizing pulse included in a composite synchronizing signal separated from a video signal was previously divided at a time interval equal to half the period of the horizontal synchronizing pulse, thereby obtaining a regenerated composite synchronizing signal; and a device for extracting a vertical synchronizing pulse from said regenerated vertical synchronizing pulse.