Dynamic magnetic information storage or retrieval – General processing of a digital signal – Pulse crowding correction
Reexamination Certificate
2005-06-28
2005-06-28
Faber, Alan T. (Department: 2651)
Dynamic magnetic information storage or retrieval
General processing of a digital signal
Pulse crowding correction
C360S053000, C360S065000
Reexamination Certificate
active
06912100
ABSTRACT:
A magnetic recording/reproducing apparatus includes a partial-response equalization circuit having frequency characteristic of cutting off low-frequency signal components inclusive of DC components; and a maximum-likelihood decoder, in which a reproduced signal outputted from the reproducing head is processed by the partial-response equalization circuit and then inputted into the maximum-likelihood decoder to be data-reproduced, thereby reducing a noise and distortion on the reproduced signal and reducing a data detection error rate.
REFERENCES:
patent: 5581568 (1996-12-01), Togami
patent: 2002/0060869 (2002-05-01), Sawaguchi et al.
patent: 11066755 (1999-03-01), None
Messerschmitt, “Design of a finite impulse response for the Viterbi algorithm adn decision-feedback equalizer,” Processing of ICG, Jun. 1974.
Haykin,Introduction to Adaptive Filters, Dec. 1984.
Matsushita Toru
Nishida Yasutaka
Sawaguchi Hideki
Takano Hisashi
Antonelli Terry Stout & Kraus LLP
Faber Alan T.
Hitachi , Ltd.
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