Patent 7191200 was granted and assigned to Silicon Integrated Systems on March, 2007 by the United States Patent and Trademark Office.
The method and apparatus use two inequalities to determine whether an estimated value obtained from conventional method and a correct value obtained from ideal conversion is identical. When those values are the same, the estimated value is not corrected; otherwise, according to the difference between those values, one is added or subtracted from the estimated value to obtain the correct result.