| 摘要 |
An error function calculation device, which performs processing of calculating an error function F<SUB>M</SUB>(T) having T (positive real number) as a variable and M (M is an integer of 0 or more) as an order, includes a coefficient table and a calculation section. The coefficient table stores a value of F<SUB>M+i</SUB>(T<SUB>0</SUB>)/F<SUB>M</SUB>(T<SUB>0</SUB>) (i is at least one integer among 1 to n, and n is a natural number) calculated for T<SUB>0</SUB>, obtained by an n-th order polynomial approximation of the error function F<SUB>M</SUB>(T), or a multiplied value which is obtained by multiplying the value of F<SUB>M+i</SUB>(T<SUB>0</SUB>)/F<SUB>M</SUB>(T<SUB>0</SUB>) by a constant. The calculation section reads the value of F<SUB>M+i</SUB>(T<SUB>0</SUB>)/F<SUB>M</SUB>(T<SUB>0</SUB>) or the multiplied value from the coefficient table, and performs at least a part of the processing of calculating a value of the error function F<SUB>M</SUB>(T) by a fixed-point arithmetic using the value of F<SUB>M+i</SUB>(T<SUB>0</SUB>)/F<SUB>M</SUB>(T<SUB>0</SUB>) or the multiplied value.
|
