Write clock pulse generator used for a time base corrector

Details Write clock pulse generator used for a time base corrector Write clock pulse generator used for a time base corrector

H - Electricity

04

N

352/18.31

H04N 9/89 (2006.01) H03L 7/089 (2006.01) H04N 9/896 (2006.01)

Patent

CA 1235800

ABSTRACT OF THE DISCLOSURE 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 inte- ger), 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 fre- quency of the variable oscillator is controlled by the compared output therebetween, whereby to produce a second clock synchro- nized in phase with the color burst signal and the frequency of which is n times the horizontal synchronizing signal.

487218

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