Calculator for calculating a.sup.x with the base a of any positive number by calculating common logarithm of a
US4158889A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 8, 1978 |
| Grant date | Jun 19, 1979 |
| Priority date | — |
| Expiry date | Feb 8, 1998 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F7/556
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A calculator for calculating a.sup.x with the base a of an optional positive number comprises a first circuit for calculating log.sub.10 a. A multiplier calculates x.multidot.log.sub.10 a,which is separated into an integral part z.sub.i and a fractional part z.sub.f. The integer z.sub.i represents the place of the decimal point in the desired result. A second circuit calculates 10.sup.z .sbsp.f which gives the desired result as a number equal to or greater than unity and smaller than ten. The number is stored in a register without the decimal point. With the decimal point put as indicated by the integer z.sub.i, the number gives the desired result. A second circuit may comprise a combination of operation registers, a multiplier, and an adder for calculating the power by combination of multiplication and addition.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.