Method of compressing lookup table for reducing memory, non-linear function generating apparatus having lookup table compressed using the method, and non-linear function generating method
US6900747B2 · kind B2 · utility
13Cited by
6References
20Claims
0Family size
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Key dates
| Filing date | Oct 15, 2003 |
| Grant date | May 31, 2005 |
| Priority date | — |
| Expiry date | Nov 14, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M7/30
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
In a method of compressing a lookup table for reducing memory, a non-linear function generating apparatus having a lookup table compressed using the method, and a non-linear function generating method, X-coordinates of the non-linear function are separated into a plurality of sections including steps that have predetermined step sizes. Y-coordinate values corresponding to X-coordinate values are extracted for each step. The Y-coordinate values are stored in predetermined addresses in a memory, wherein the step sizes are different according to the sections. In this manner, memory capacity occupied by the lookup table is reduced.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.