INVERSE CALCULATION APPARATUS, INVERSE CALCULATION METHOD AND INVERSE CALCULATION PROGRAM

摘要

PROBLEM TO BE SOLVED: To provide an inverse calculation apparatus, an inverse calculation method and an inverse calculation program for calculating the inverse of input data without using a memory in which the tilt data or segment data of the approximate expression of an inverse proportional curve are stored.;SOLUTION: A data conversion part 10 converts input data into intermediate data settled in a predetermined data extent by a first bit shift operation to the input data. A value region specification part 11 specifies a range to which the intermediate data belongs from ranges with values as factorials of 2 as boundary values set within the data extent. An inverse calculation part 12 calculates the coefficients of the primary approximate expression of the inverse proportional curve with the intermediate data as variables, and calculates the inverse of the intermediate data from the calculated coefficients and the intermediate data. A data re-conversion part 13 converts the inverse of the intermediate data into the inverse of the input data by a second bit shift operation corresponding to the first bit shift operation.;COPYRIGHT: (C)2008,JPO&INPIT