Dynamic information storage or retrieval – Condition indicating – monitoring – or testing – Including radiation storage or retrieval
Reexamination Certificate
2004-01-26
2008-09-23
Feild, Joseph (Department: 2627)
Dynamic information storage or retrieval
Condition indicating, monitoring, or testing
Including radiation storage or retrieval
C369S053310, C369S053220, C714S100000
Reexamination Certificate
active
07428203
ABSTRACT:
Reproduction signals include patterns for which recognition errors are likely. With respect to such patterns, probable error patterns are prepared. Tables showing correct patterns and error patterns are prepared, and evaluation values accurately representing signal quality are calculated. In an apparatus using a PRML method, discrimination data and a plurality of predetermined bit sequence pairs are examined to detect matching. A bit sequence and corresponding two ideal responses are calculated. Euclidean distances between the two ideal responses and equalization signals are obtained, and the difference between the Euclidean distances is further obtained. A quality evaluation value of a reproduction signal is calculated based on a mean value, a standard deviation, an appearance probability of the predetermined bit sequence, and a Hamming distance between the predetermined bit sequence pairs.
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Iwanaga Toshiaki
Kashihara Yutaka
Nagai Yuji
Nakano Masaki
Ogawa Masatsugu
Feild Joseph
Gupta Parul
Kabushiki Kaisha Toshiba
NEC Corporation
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
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