Dynamic magnetic information storage or retrieval – General recording or reproducing – Specifics of equalizing
Patent
1996-09-16
1998-10-20
Psitos, Aristotelis M.
Dynamic magnetic information storage or retrieval
General recording or reproducing
Specifics of equalizing
360 46, 360 51, 375229, G11B 535
Patent
active
058255702
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: 5422760 (1995-06-01), Abbott et al.
patent: 5442492 (1995-08-01), Cunningham et al.
patent: 5459679 (1995-10-01), Ziperovich
patent: 5526200 (1996-06-01), Yada
patent: 5638225 (1997-06-01), Tsuboi et al.
IEEE Transactions on Magnetics, vol. 31, No. 2, pp. 1103-1108; Mar. 1995.
IBM TDB, vol. 36, No. 3, pp. 457 to 467; Mar. 1993.
Tietze/Schenk, Halbleiter-Schaltungstechnik, 6th Edition; Springer Publications; Berlin, Hidelberg, New York, Tokyo; pp. 745 to 747; 1983.
M.J. Ferguson, Optimal Reception for Binary Partial-Response Channels, The Bell System Technical Journal, vol. 51, No. 2, pp. 493-505, Feb., 1972.
F. Dolivo, W. Scott and G. Ungerbock, Fast Timing Recovery For Partial-Response Signaling Systems, 1989 IEEE CH2655-9/89-0000-0573, pp. 573-577.
IEEE Transactions on Magnetics, vol. 31, No. 2., Mar. 1995, p. 1003 to 1108 .
Kanegae Masahide
Kondou Masao
Sugaya Tomoki
Tanaka Hiroyuki
Fujitsu Limited
Psitos Aristotelis M.
Wamsley Patrick
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