A clock pulse generator has a first clock pulse generator for generating a burst lock clock pulse signal synchronized with a color burst signal contained in a video signal; a second clock pulse generator for generating a line lock clock pulse signal synchronized with a horizontal synchronizing signal...http://www.google.ca/patents/US5025310?utm_source=gb-gplus-sharePatent US5025310 - Clock pulse generator capable of being switched to process both standard and non-standard television signals
