Method and apparatus for the correction of a / d - converted output data

摘要

Not - linear correction method for linear correction of the not - linearity of an input / output - characteristic curve for digital data, wherein the input / output characteristic curve - a relationship between an analog signal and a digital signal which includes the steps of:Setting a line in the direct relation to the analog signal into an input area of the analog signal as an ideal a / d - line on an analog signal - digital - data - coordinate system and dividing the input area of the analog signal on n regions;Approach of the input / output - characteristic curve by an approximation line in a range from the n regions, wherein the area of either a minimum value or a maximum value of the analog signal, and the approach line, a other coordinate point than the two end points of the input / output - characteristic curve and a coordinate point of the boundary with an adjacent region;Approach of the input / output - characteristic curve by an approximation line in a different region of the n regions than the region, which contains the minimum value, and the area of the maximum value, wherein the approach line both ends of the input / output - characteristic curve in the other region; andin each of the n regions,(1) Deriving a umsetzgleichung for converting of coordinates of a point on the approach line in accordance with an analog signal value to coordinates of a point on the ideal a / d - line in accordance with the analog signal value, and(2) Converting the digital data output from the a / d - converter (70) by means of the umsetzgleichung.