Method and apparatus for determining the magnitude of a square r

Details Method and apparatus for determining the magnitude of a square r Method and apparatus for determining the magnitude of a square r

1986-05-21

1987-09-15

Harkcom, Gary V.

Boots, shoes, and leggings

364730, G06F 738

Patent

active

046944176

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.

REFERENCES:
patent: 3748440 (1973-07-01), Alexander
patent: 3829671 (1974-08-01), Gathright et al.
patent: 3917935 (1975-11-01), Lazecki
patent: 4486846 (1984-12-01), McCallister et al.
patent: 4584556 (1986-04-01), Chan
Hemel, "Square Root Extraction with Read Only Memories", Computer Design pp. 100-104, Apr. 1972.

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