Floating point to logarithm converter

Details Floating point to logarithm converter Floating point to logarithm converter

1991-12-26

1994-11-15

Mai, Tan V.

Boots, shoes, and leggings

364748, 341 75, 341106, G06F 700

Patent

active

053654650

ABSTRACT:
A method converts an n-bit floating point number to a logarithmic representation, the number having a first set of bits assigned to a mantissa, and a second set of bits assigned to an exponent. The logarithmic representation has a characteristic and a fraction. The method: (a) sets the characteristic of the logarithm equal to the second set of bits; (b) selects from a logarithm table a first logarithm of a first subset of the first set; (c) selects from the logarithm table a slope of a logarithmic function at the first logarithm; (d) multiplies the slope times a second subset of the first set to obtain an interpolated value; (e) adds the interpolated value to the first logarithm to obtain the fraction; and (f) adds the characteristic and the fraction to obtain the logarithmic representation.

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patent: 4777613 (1988-10-01), Shahan et al.
patent: 4858163 (1989-08-01), Boreland
patent: 4891754 (1990-01-01), Boreland
patent: 5197024 (1993-03-01), Pickett

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