COLOR SYSTEM AUTO-CHANGING DEVICE FOR USING COLOR KILLER VOLTAGE

摘要

a color signal processor(1) for generating a killer voltage level from a video color signal; a comparator(2) for comparing the killer voltage level with a reference voltage level of color mode, a microprocessor(4) for detecting, shaping and controlling the drum PG signal of the video head and generating head switching pulse; a first switching circuit(3) for allowing the head switching pulse to be outputted selectively; a flip-flop(5) for changing or maintaining the output according to the head switching pulse; and a second switching circuit(6) for providing a color mode control signal to the color signal processor(1) according to the voltage level outputted from the flip-flop(5).