Logarithmic lookup tables

Details Logarithmic lookup tables Logarithmic lookup tables

2005-09-27

2005-09-27

Ngo, Chuong D (Department: 2193)

Electrical computers: arithmetic processing and calculating

Electrical digital calculating computer

Particular function performed

Reexamination Certificate

active

06950841

ABSTRACT:
In one embodiment, the invention is directed toward techniques for generating results in a logarithmic domain. The techniques may exploit properties of a logarithmic function to reduce the memory requirements needed to implement lookup tables. For example, the techniques may utilize non-uniform sampling over a logarithmic or logarithmic-like function to reduce the number of entries needed for a given lookup table. In particular, the techniques may involve separating a number into an exponent component and a mantissa component. Each of these different components can then be converted from a first domain to a second domain using different lookup tables.

REFERENCES:
patent: 5600581 (1997-02-01), Dworkin et al.
patent: 5642305 (1997-06-01), Pan et al.
patent: 11212768 (1999-06-01), None

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