Sampled amplitude read channel for processing multiple data streams in a disc storage system
US5852524A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 27, 1997 |
| Grant date | Dec 22, 1998 |
| Priority date | — |
| Expiry date | May 27, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/5926
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In a disc storage system employing multiple recording heads to increase throughput by providing simultaneous access through multiple data streams, a sampled amplitude read channel is disclosed for detecting, in parallel, estimated data sequences from the read signals associated with each data stream. Timing recovery in the read channel is implemented through interpolation, that is, by asynchronously sampling the analog read signals and interpolating to synchronous sample values. In this manner, a frequency synthesizer can generate a single reference clock for clocking operation of all the discrete time circuitry, thereby eliminating noise caused by multiple clocks as well as simplifying diagnostics. Furthermore, interpolated timing recovery avoids noise due to cross-talk between voltage controlled oscillators (VCOs) that would likely occur in a conventional synchronous sampling timing recovery design. A significant advantage is that the read channel can reside in a single integrated circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.