PRML regenerating apparatus

Details PRML regenerating apparatus PRML regenerating apparatus

1996-09-13

1998-12-08

Psitos, Aristotelis M.

Dynamic magnetic information storage or retrieval

General recording or reproducing

Specifics of equalizing

360 46, 360 45, 360 40, G11B 5035

Patent

active

058478914

ABSTRACT:
Disclosed is a PRML regenerating apparatus for regenerating a signal read by a head from a storage medium. This PRML regenerating apparatus has a waveform equalizing circuit for waveform-equalizing the read signal, a maximum-likelihood decoder for maximum-likelihood-decoding, after obtaining a determination value by comparing the equalized output with upper and lower slice levels, this determination value and a control circuit for setting variable a distance between the upper slice level and the lower slice level of the maximum-likelihood decoder. The distance between the upper and lower slice levels can be thereby set variable in accordance with an equalization characteristic. A ternary determination circuit of the maximum-likelihood decoder is constructed of a memory for storing a correspondence table of the equalized output and the upper or lower slice level versus the determination result and the next upper or lower slice level. The ternary determination circuit can be thereby actualized with a simple configuration.

REFERENCES:
patent: 4272729 (1981-06-01), Riley, Jr.
patent: 4644564 (1987-02-01), Dolivo et al.
patent: 4707681 (1987-11-01), Eggenberger et al.
patent: 4786890 (1988-11-01), Marcus et al.
patent: 4888775 (1989-12-01), Karabed et al.
patent: 4970609 (1990-11-01), Cunningham et al.
patent: 5060088 (1991-10-01), Dolivo et al.
patent: 5105316 (1992-04-01), Cronch et al.
patent: 5222002 (1993-06-01), Hase et al.
patent: 5248970 (1993-09-01), Sooch et al.
patent: 5367411 (1994-11-01), Nishiyama et al.
patent: 5406427 (1995-04-01), Shimoda
patent: 5442492 (1995-08-01), Cunningham et al.
patent: 5442760 (1995-08-01), Abbott et al.
patent: 5459679 (1995-10-01), Ziperovich
patent: 5526200 (1996-06-01), Yada
patent: 5638225 (1997-06-01), Tsuboi
IBM TDB, vol. 36, No. 3, pp. 457 to 467; Mar. 1993.
Tietze/Schenk, Halbleiter-Schaultungstechnik, 6th Edition; Springer Publications; Berlin, Hidelberg, New York, Tokyo; pp. 745 to 747; 1983.
IEEE Transactions on Magnetics, vol. 31, No. 2., Mar. 1995, pp. 1003 to 1108.

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