Phase responsive composite video signal control system
Patent 4642682 Issued on February 10, 1987. Estimated Expiration Date: 
April 27, 2004. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
April 27, 2004. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3558806 3604841 3610815 3637920 3735026 3740459 3824336 3893166 Electronic signal mixer Signal comparator circuit InventorsAssigneeApplicationNo. 06/604845 filed on 04/27/1984US Classes:358/520, Hue, saturation and luminance348/104, Color TV348/650Scene by scene color correctionExaminersPrimary: Shepperd, John W.Attorney, Agent or FirmInternational ClassesH04N 9/11 (20060101)H04N 9/64 (20060101) AbstractA 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.Other References
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