Patent ID: 6356125
Filing Date: 2002-03-12
Classification: H04N

Abstract:
A ramp generator for producing a ramp signal corresponding to a video frame comprised of v video lines (where v is an integer from 0 to m), each video line having h pixels (where h is an integer from 0 to n), said ramp generator comprising:first, second, and third coefficient registers for storing coefficients A, B, and C, respectively; a first selector for selecting the coefficients A, B, and C stored in the coefficient registers; first and second feedback registers for storing first and second accumulated values, respectively; a second selector for selecting the first and second accumulated values stored in the feedback registers; an adder for producing said ramp signal by incrementally adding the coefficients selected by said first selector to the accumulated values selected by said second selector; said first accumulated value being output as the ramp signal from said adder; the output of said adder also being fed back to said first and second feedback registers so that the incremented first and second accumulated values can be stored respectively therein; and control means for controlling said first and second selectors so that said second accumulated value is incremented by the adder for each video line to equal Bv+C, and said first accumulated value is incremented by the adder for each pixel to equal Ah+Bv+C.