Dynamic magnetic information storage or retrieval – General processing of a digital signal – Head amplifier circuit
Patent
1995-11-17
1999-02-16
Hindi, Nabil
Dynamic magnetic information storage or retrieval
General processing of a digital signal
Head amplifier circuit
360 51, G11B 509
Patent
active
058726667
ABSTRACT:
Reproducing apparatus with an A/D (analog-to-digital) converter, which realizes high-accuracy data sampling, high-speed data transfer, low dissipation power and low cost. PR (partial response) processing is performed by receiving encoded signals, delaying the received signals on the basis of a reference clock, and adding the delayed signals and the received signals in analog signal form. The added signals are converted into digital values on the basis of the reference clock by the A/D converter, and Viterbi decoding is performed on the basis of the converted digital values. Owing to the PR processing which is performed at a stage preceding the A/D converter, a frequency band for the A/D conversion can be lowered, and hence, the high-accuracy data sampling is permitted.
REFERENCES:
patent: 4340882 (1982-07-01), Maio et al.
patent: 5233482 (1993-08-01), Galbraith et al.
patent: 5341249 (1994-08-01), Abbott et al.
patent: 5563864 (1996-10-01), Kobayashi et al.
Dictionary of Computers, Information Processing & Telecommunications, Jerry M. Rosenberg, p. 212, 1984.
Ashikawa Kazutosi
Hirooka Tsuguyoshi
Mita Seiichi
Miyazawa Shoichi
Saiki Eisaku
Hindi Nabil
Hitachi , Ltd.
Neal Regina Y.
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