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:
Oct. 03, 2000
Filed:
Apr. 06, 1998
Keisuke Yasui, Tokyo, JP;
Teruo Okabe, Tokyo, JP;
Kabushiki Kaisha Sega Enterprises, Tokyo, JP;
Abstract
Methods and systems consistent with the present invention provide an arithmetic unit, which uses a high speed yet small circuit, using a highly precise method for numerical interpolation that uses Newton-Raphson method. A table for referencing sampling values and operation results is stored successively and alternately in two simultaneously accessible memories 422, 423. A table reference address determining portion 4211 takes the table reference address from the input B. The access control circuit 4212 prepares an address for accessing each memory from the table reference address and reads table values. The interpolation operating portion 4213 interpolates the table value at a precision of half the final precision. The Newton-Raphson operation 4214 performs the Newton-Raphson operation once with the primary interpolated numerical value as the initial value and attains the calculation results with the final precision by precise square convergence.