Readback apparatus and readback method

Details Readback apparatus and readback method Readback apparatus and readback method

Filed on

2007-08-30

Date issued

2010-06-01

Examiner

Olson, Jason C (Department: 2627)

Patent Class

Dynamic magnetic information storage or retrieval

SubClass

General processing of a digital signal

Other Related Categories

C360S065000

Type

Reexamination Certificate

Status

active

Patent number

07729071

Description

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.

REFERENCES:
patent: 2007/0211362 (2007-09-01), Li et al.
patent: 2002-367291 (2002-12-01), None
patent: 2003-68024 (2003-03-01), None
patent: 2005-166089 (2005-06-01), None
Notice of Reason for Rejection from the Japanese patent office for application No. 2006-348003, Mailed Jan. 6, 2009, with English language translation, thereof, total of 5 pages.
Abbott et al.; “Offtrack Interference and Equalization in Magnetic Recording”, IEEE Transactions on Magnetics, vol. 24, No. 6, pp. 2964-2966, (1988).
Abbott et al.; “Performance of Digital Magnetic Recording With Equalization and Offtrack Interference”, IEEE Transactions on Magnetics, vol. 27, No. 1, pp. 705-716, (1991).
Roh et al.; Single-Head/Single-Track Detection in Interfering Tracks, IEEE Transactions on Magnetics, vol. 38, No. 4, pp. 1830-1838, (2002).

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