Digital magnetic recording/reproducing apparatus

Details Digital magnetic recording/reproducing apparatus Digital magnetic recording/reproducing apparatus

2005-03-29

2005-03-29

Chin, Stephen (Department: 2634)

Pulse or digital communications

Receivers

Particular pulse demodulator or detector

C714S751000, C714S752000, C714S753000, C714S754000, C714S755000, C714S758000

Reexamination Certificate

active

06873665

ABSTRACT:
A digital magnetic recording/reproducing apparatus includes an LVA (List Viterbi Algorithm) detector which produces first to nth best sequences (n>1) of a decoded result, and replaces a likelihood ratio and a path memory of the ith best sequence (i=2, 3, . . . , n) with those of the (2i−1)th best sequence when contents of path memories of the (i−1)th and ith best sequences are equal to each other and an absolute value of a difference between likelihood ratios of the (i−1)th and (2i−1)th best sequences is smaller than a decision threshold. Alternatively, the LVA detector initializes a likelihood ratio of the ith best sequence to be a likelihood ratio of the (i−1)th best sequence with a constant difference value added thereto when contents of path memories of the (i−1)th and ith best sequences are equal to each other.

REFERENCES:
patent: 5208816 (1993-05-01), Seshardi et al.
patent: 5537444 (1996-07-01), Nill et al.
patent: 5822340 (1998-10-01), Stenström et al.
patent: 5889823 (1999-03-01), Agazzi et al.
patent: 6046874 (2000-04-01), Takahashi
patent: 6-284018 (1994-10-01), None
patent: 8-293164 (1996-11-01), None
patent: 9-213008 (1997-08-01), None
J. Lee et al., “An Advanced Winchester Disk Controller”,Proceedings of Technical Papers, 1989 International Symposium on VLSI Technology, Systems and Applications, May 17-19, 1989, Taipei, Taiwan, pp. 376-379, published by IEEE, 1989.
N. Seshadri et al., “List Viterbi Decoding Algorithms with Applications”,IEEE Transactions on Communications, vol. 42, No. 2/3/4, Feb./Mar./Apr. 1994, pp. 313-323.
Y. Lin et al., “A Generalized Viterbi Algorithm for Detection of Partial Response Recording Systems”,IEEE Transactions on Magnetics, vol. 32, No. 5, Sep. 1996, pp. 3983-3985.

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