Rate 24/25 modulation code for PRML recording channels
US5757294A · kind A · utility
41Cited by
7References
21Claims
0Family size
Assignee
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Key dates
| Filing date | Dec 31, 1996 |
| Grant date | May 26, 1998 |
| Priority date | — |
| Expiry date | Dec 31, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2020/1449
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Rate 24/25 modulation encoding methods and apparatus improve efficiency in a PRML magnetic recording channel. The rate 24/25 code word uses rate 8/9 RLL encoding of one byte of user data, combined with interleaved unencoded bytes to achieve improved code rates with reasonable global run length constraint. Use of the the rate 8/9 RLL (0,3) subcode results in a rate 24/25 RLL (0,11) code, while a rate 8/9 (0,6/5) subcode results in a rate 24/25 RLL (0,14/13) code.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.