Dynamic magnetic information storage or retrieval – General recording or reproducing – Specifics of equalizing
Reexamination Certificate
2008-09-17
2010-10-19
Mercedes, Dismery E (Department: 2627)
Dynamic magnetic information storage or retrieval
General recording or reproducing
Specifics of equalizing
C360S031000, C360S039000, C360S062000
Reexamination Certificate
active
07817367
ABSTRACT:
To effectively suppress a signal in a low frequency region in which the medium noise and the signal distortion are concentrated, and in order to effectively utilize a detected component of the reproduced signal in the low frequency region, a target of partial response equalization to the perpendicularly recorded/reproduced signal is set so that the low-frequency component around the direct current is suppressed to a regulated quantity for both the effective suppression and the effective utilization. Accordingly, a maximum-likelihood decoding process is carried out through the target of partial response equalization. Reliability of data detection is made higher and a signal-to-noise ratio is improved, so that the noise from the recording medium can be reduced more and it is possible to provide a high-density magnetic recording/reproducing apparatus.
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Nishida Yasutaka
Sawaguchi Hideki
Takano Hisashi
Tsuchinaga Hiroyuki
A. Marquez, Esq. Juan Carlos
Hitachi Global Storage Technologies Japan Ltd.
Mercedes Dismery E
Stites & Harbison PLLC
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