Video signal correction system with low chrominance circuit for modifying currections
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United States of America Patent
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-
Feb 23, 1988
Issued Date -
N/A
app pub date -
Jul 29, 1985
filing date -
Apr 27, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A phase responsive video parameter control system operative for correcting hue, saturation, and luminance of a phase encoded component of a composite video signal. A digital phase detector detects the instantaneous hue of the video image, and provides a signal which selects which one of a plurality of color intervals or bands the detected instantaneous hue falls in. Prestored digital correction values associated with the selected color interval are retrieved from memory and converted into analog correction signals which modify the phase, amplitude, and DC level of the composite video signal. New digital correction values, which reflect operator control panel adjustments, may be loaded into memory during the vertical retrace interval, thereby allowing frame-by-frame color correction.
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