High rate runlength limited codes for 8-bit ECC symbols
US6201485A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 9, 1999 |
| Grant date | Mar 13, 2001 |
| Priority date | — |
| Expiry date | Jul 9, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B20/1813
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A methodology for designing and implementing high rate RLL codes is optimized for application to 8-bit ECC symbols, and provides modulation code rates including rate 32/33; rate 48/49; rate 56/57; rate 72/73; rate 80/81 and other code rates for use in magnetic recording channels. A relatively small subcode encoding--one easy to implement--is applied to a portion of the input stream, and the resulting base codeword is partitioned into nibbles that, in turn, are interleaved among the unencoded ECC symbols. Code constraints on the subcode word nibbles depend upon the values of adjacent unencoded symbols. The resulting codes provide excellent density and error propagation performance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.