Write clock pulse generator used for a time base corrector

Abstract From the Canadian patent

A write clock pulse generator is disclosed in which, a horizontal synchronizing signal is separated from an input video signal and supplied to a PLL (phase locked loop) circuit to form a first clock with the frequency of nfH (n is an integer), a color burst signal is separated from the input video signal and used to drive a gate type variable oscillator to thereby form a second clock synchronized in phase with the color burst signal and whose average frequency is nfH a dif-, ference between the pulse widths of the clocks resulting from counting down the first and second clocks to l/M and the frequency of the variable oscillator is controlled by the compared output therebetween, whereby to …