| 摘要 |
A readback apparatus calculates (3, 4) a variance value of a signal read by a head from a disc medium, estimates (5) 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, calculates (7) a soft decision likelihood value for the signal using the degree of offtracking and the interference power, and performs (8) error correcting decoding using the soft decision likelihood value.
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