Method for calculating an error detecting code
US7716556B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 8, 2006 |
| Grant date | May 11, 2010 |
| Priority date | — |
| Expiry date | Mar 11, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2220/2537
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A method applied to an optical disc drive for calculating an error detection code corresponding to a data sector is disclosed. The data sector includes a plurality of bytes arranged in a matrix having N lines along a first direction and M lines along a second direction perpendicular to the first direction. The method includes: along the first direction, calculating error detection codes corresponding to M bytes located at each of the N lines, wherein for each of the N lines, only bytes having error bits affect an error detection code for the line; adjusting an error detection code of each of the N lines according to a displacement between each of the N lines and a last line of the N lines; and then determining the error detection code of the data sector by summing up the displacement-adjusted error detection code of each of the N lines.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.