Phase responsive composite video signal control system
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United States of America Patent
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Oct 24, 1989
Issued Date -
N/A
app pub date -
Jan 11, 1988
filing date -
Apr 27, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Improvements in a phase responsive video parameter control system for correcting hue, saturation and luminance of a phase encoded composite video signal are disclosed. The system has a phase detector that detects which of a plurality of color intervals or hue bands the instantaneous signal falls in. Luminance, hue and saturation corrections for each band are applied to the uncorrected video. The improvements include correction signal selection circuit that select the correction signals twice per subcarrier cycle, a damping circuit that smooths the transition between two correction signals when the hue moves to a different color interval or band, and a phase shifter that allows the centers of the bands to be moved without changing the width of the band.
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