The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 04, 2008
Filed:
Nov. 29, 2004
Hisao Sato, Suwa, JP;
Hisao Sato, Suwa, JP;
Seiko Epson Corporation, , JP;
Abstract
An error function calculation device, which performs processing of calculating an error function F(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(T)/F(T) (i is at least one integer among 1 to n, and n is a natural number) calculated for T, obtained by an n-th order polynomial approximation of the error function F(T), or a multiplied value which is obtained by multiplying the value of F(T)/F(T) by a constant. The calculation section reads the value of F(T)/F(T) 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(T) by a fixed-point arithmetic using the value of F(T)/F(T) or the multiplied value.