Apparatus for detecting a chrominance reference burst component to develop a burst gate pulse

摘要

Apparatus for generating a burst gate pulse from composite video includes a threshold detector for generating output pulses on consecutive positive and negative going burst signal cycles. Output signal from the threshold detector is applied to a digital correlator which generates a control signal when a predetermined signal sequence is produced by the detector. The control signal energizes a counter to count clock pulses synchronized with the burst signal to generate a burst gate pulse have a width equal to a predetermined number of burst signal cycle periods.