VIDEO-SIGNAL PROCESSING SYSTEM AND METHOD WITH ABOVE-WHITE-LEVEL NOISE INVERSION

This disclosure depicts method and apparatus for processing a television video signal, particularly for processing a noise-adulterated video signal as developed by synchronous-type video detectors. The disclosed method and apparatus involves sensing in a video signal developed by a synchronous-type video detector noise components having amplitude levels exceeding a predetermined reference level above a level which corresponds to a maximum white video display. A modified video signal is developed for supply to the luminance controls of a video image display device. In the modified signal the sensed above-white-level noise energy is inverted so as to prevent over-driving of the associated image display device. The noise-adulterated video signal from the video detector is supplied directly to a sync separator and AGC stage without noise inversion so as to avoid the introduction of a spurious DC component capable of falsely altering the video signal level relative to an AGC reference level.