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US 7,729,071 B2Granted
Readback apparatus and readback method
AssigneeKabushiki Kaisha Toshiba
InventorKohsuke Harada
Life of this patent
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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.
Claims14
A readback apparatus comprising:
- a variance calculator to calculate a variance value of a signal read by a head from a disc medium;
- an estimation unit configured to estimate 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;
- a likelihood calculator to calculate a soft decision likelihood value for the signal using the degree of offtracking and the interference power;
- and
- a decoder to perform error correcting decoding using the soft decision likelihood value.
2 more elements
A readback method including:
- calculating a variance value of a signal read by a head from a disc medium;
- estimating 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;
- calculating a soft decision likelihood value for the signal using the degree of offtracking and the interference power;
- and
- performing error correcting decoding using the soft decision likelihood value.
2 more elements
Dependencies are inferred from the claim text.