Write precompensation optimization in a PRML channel using a sel

Details Write precompensation optimization in a PRML channel using a sel Write precompensation optimization in a PRML channel using a sel

1994-10-04

1996-02-20

Psitos, Aristotelis

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Pulse crowding correction

360 46, 360 53, G11B 509

Patent

active

054934540

ABSTRACT:
Write precompensation optimization for a partial response maximum likelihood ("PRML") magnetic recording channel adapted to a mass production environment. Optimal write precompensation may be determined by writing a tribit data pattern known to produce worst case nonlinear transition shift ("NLTS") onto a magnetic recording medium; reading back the recorded data pattern; and calculating the mean-squared error ("MSE") for one or more of the equalized data sample levels associated with the PRML channel to be optimized. The writing and reading back process is repeated with varying amounts of precompensation applied to the written pattern. The optimal amount of write precompensation is determined either by minimizing the MSE for a selected sample level or by minimizing MSE between the middle and the upper or lower of the ternary PRML sample levels.

REFERENCES:
patent: 5241429 (1993-08-01), Holsinger
patent: 5341249 (1994-08-01), Abbott et al.
Newby et al, "The Effects of Nonlinear Distortion on Class IV Partial Response", IEEE Trans. on Magnetics vol. 22, pp. 1203-1205 (1986).
Palmer et al., "Identification of Nonlinear Write Effects Using Pseudorandom Sequences", IEEE Trans. on Magnetics, vol. 23, pp. 2377-2379, (1987).
Zperovich, "Performance Degradation of PRML Channels Due to Nonlinear Distortions", IEEE Trans. on Magnetics, vol. 27, No. 5, pp. 4825-4827 (1991).

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