Disk storage system employing error detection and correction of channel coded data, interpolated timing recovery, and retroactive/split-segment symbol synchronization
US6009549A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 15, 1997 |
| Grant date | Dec 28, 1999 |
| Priority date | — |
| Expiry date | May 15, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2020/1476
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A disk storage system is disclosed wherein user data received from a host system is first encoded according to a first channel code having a high code rate, and then encoded according to an ECC code, such as a Reed-Solomon code, wherein the ECC redundancy symbols are encoded according to a second channel code having low error propagation. In the preferred embodiment, the first channel code is a RLL (d,k) code having a long k constraint which allows for longer block lengths (and higher code rates). During read back, a synchronous read channel samples the analog read signal a synchronously and interpolates the asynchronous sample values to generate sample values substantially synchronized to the baud rate. In contrast to conventional synchronous-sampling timing recovery, interpolated timing recovery can tolerate a longer RLL k constraint because it is less sensitive to noise in the read signal and not affected by process variations in fabrication. Additionally, a trellis sequence detector detects an estimated binary sequence from the synchronous sample values, wherein a state transition diagram of the trellis detector is configured according to the code constraints of the first and s…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.