Readback apparatus and readback method
US7729071B2 · kind B2 · utility
31Cited by
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14Claims
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Key dates
| Filing date | Aug 30, 2007 |
| Grant date | Jun 1, 2010 |
| Priority date | — |
| Expiry date | Nov 25, 2028 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M13/2957
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A readback apparatus (a) calculates a variance value of a signal read by a head from a disc medium, (b) estimates a degree of offtracking of the head from a target track to an adjacent track, and interference power from the adjacent track using the variance value of the signal, (c) calculates a soft decision likelihood value for the signal using the degree of offtracking and the interference power, and (d) performs error correcting decoding using the soft decision likelihood value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.