Vertical synchronizing signal detector for television video signal reception

摘要

A television video vertical sync detector which produces a vertical sync pulse. This detector includes a separating circuit for the production of horizontal sync pulses, equalizing pulses and vertical sync pulses, and a phase control oscillator. The phase control oscillator includes a phase comparator low pass filter, a voltage control oscillator for generating clock pulses, a division circuit and a delay circuit. A sampling circuit is used to generate the final vertical sync pulse.