Apparatus and method for digital correction of non-linearity using a piecewise linear approximation technique
US6573934B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 3, 1998 |
| Grant date | Jun 3, 2003 |
| Priority date | — |
| Expiry date | Dec 3, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/202
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Digital correction of non-linearity using a piecewise linear approximation method generates uniform errors of minimal magnitude regardless of the size of an input signal. The non-linear curve is partitioned into a number of sections which are increased over conventional techniques, without increasing the number of function values, or the amount of hardware required. A non-linear curve is divided into a first direct line and a second direct line using a piecewise linear approximation method. A third direct line links two points spaced to either side of an inflection point at the intersection of the first and second direct lines by a predetermined distance. The slope of the third direct line corresponds to the average of the slopes of the first and second direct lines. When an input x lies in the section of the third direct line, a corrected signal according to the third direct line is generated. When the input x is between a predetermined point of the first or second direct lines and the starting point of the third direct line, a corrected signal according to the first or second direct lines is generated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.