Method and apparatus for performing mathematical functions using polynomial approximation and a rectangular aspect ratio multiplier
USRE39385E1 · kind E1 · reissue
Assignee
Inventors
Key dates
| Filing date | Aug 19, 1993 |
| Grant date | Nov 7, 2006 |
| Priority date | — |
| Expiry date | Aug 19, 2013 |
Classification
- Technology area (CPC —)General
Abstract
A method for approximating mathematical functions using polynomial expansions is implemented in a numeric processing system (10) which comprises a control and timing circuit (18), a microprogram store (20) and a multiplier circuit (34). The multiplier circuit (34) may comprise a rectangular aspect ratio multiplier circuit (40) having an additional ADDER INPUT to enable the repeated evaluation of first order polynomials to evaluate polynomial expansions associated with each mathematical function. A constant store (28) is used to store predetermined coefficients for the polynomial expansion associated with each mathematical functions function. The microprogram store (20) is used to store argument transformation routines, polynomial expansions and result transformation routines associated with each mathematical function. The questions raised in reexamination request No. 90/004,138, filed Feb. 12, 1996, have been considered and the results thereof are reflected in this reissue patent which constitutes the reexamination certificate required by 35 U.S.C. 307 as provided in 37 CFR 1.570(e).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.