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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.:

US 4694417 B1

PDFFull Text
Date of Patent:
Sep. 15, 1987

Filed:

May. 21, 1986

Method and apparatus for determining the magnitude of a square root of a

Applicant:
Inventor:

Robert H Cantwell, Sudbury, MA (US);

Assignee:

Raytheon Company, Lexington, MA (US);

Attorneys:

Dawson; Walter F.

Sharkansky; Richard M.

Primary Examiner:

Gary V Harkcom

Assistant Examiner:

Dale M Shaw

Int. Cl.
CPC ...
G06F / ;
U.S. Cl.
CPC ...
364752 ; 364730 ;
Abstract

A vernier address scale reduces the number of addressable memory locations required for numerical look-up tables. Read-only memories (ROMs) store the data of linear or non-linear functions. Decoders determine which ROM is selected and advantage is taken of accuracy improvement as numbers become larger by dropping least significant bits as the vernier address scale moves from one ROM table to another. Accuracy is further improved by using a method of one-half level quantization step for rounding. This reduces the size of numerical tables for math processing of reciprocals, roots of numbers, powers of numbers, logarithms, trigonometric and exponential functions.

Find Patent Forward Citations

Cantwell, Robert. (1987). Method and apparatus for determining the magnitude of a square root of a (U.S. Patent No. 4694417). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/4694417

Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile

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