Digital circuit for calculating a logarithm of a number

Details Digital circuit for calculating a logarithm of a number Digital circuit for calculating a logarithm of a number

1993-05-28

1994-11-08

Mai, Tan V.

Boots, shoes, and leggings

G06F 700

Patent

active

053633210

ABSTRACT:
A digital circuit computes the logarithm of a number. The circuit makes the computation by first determining a multiplicity of factors f.sub.i from a predetermined set of factors such that the product of the multiplicity of factors f.sub.i and the number equals the base of the logarithm. A memory stores the logarithms of all the numbers in the predetermined set. The circuit then looks-up and sums the logarithms of the multiplicity of factors f.sub.i, and then subtracts the sum from one to yield the logarithm of the number.

REFERENCES:
patent: 3631230 (1971-12-01), Chen
patent: 4583180 (1986-04-01), Kmetz
patent: 4626825 (1986-12-01), Burleson et al.
Andrews "Algorithm for finding Logarithms of binary numbers to the base two", IBM Tech Discl. Bull., vol. 11 No. 8, Jan. 1969, pp. 94-916.
IBM TDB vol. 11, No. 8, Jan. 1969, pp. 914.
Computer Design, vol. 13, No. 7, Jul. 1974, Littleton, Mass., p. 106 M. Ciugudean, "Algorithm for Computing Logarithms and Antilogarithms".
Electronics Letters, vol. 12, No. 4, Feb. 19, 1976, Enage, GB, pp. 106-107, S. Magar et al., "Fast Logarithmic D. A. Conversion With Small Error".

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