专利名称：Signal evaluation method, information
recording/reproducing apparatus,information reproducing apparatus, andinformation recording medium
发明人：Kashihara, Yutaka c/o Kabushiki Kaisha
Toshiba,Nagai, Yuuji Kabushiki KaishaToshiba,Ookubo, Shuichi,Ogawa,Masatsugu,Nakano, Masaki,Iwanaga,Toshiaki
申请号：EP04000723.9申请日：20040115公开号：EP1443509A3公开日：20060111
专利附图：
摘要：Reproduction signals include patterns for which recognition errors are likely.With respect to such patterns, probable error patterns are prepared. Tables showingcorrect patterns and error patterns are prepared, and evaluation values accuratelyrepresenting signal quality are calculated. In an apparatus using a PRML method,discrimination data and a plurality of predetermined bit sequence pairs (PT, PF) areexamined to detect matching. A bit sequence and corresponding two ideal responses arecalculated. Euclidean distances (EPF,S, EPT,S) between the two ideal responses andequalization signals are obtained, and the difference (D) between the Euclidean distancesis further obtained. A quality evaluation value of a reproduction signal is calculated basedon a mean value, a standard deviation, an appearance probability of the predeterminedbit sequence, and a Hamming distance between the predetermined bit sequence pairs.
申请人：KABUSHIKI KAISHA TOSHIBA,NEC CORPORATION
地址：1-1, Shibaura 1-chome, Minato-ku Tokyo JP,7-1, Shiba 5-chome, Minato-kuTokyo JP
国籍：JP,JP
代理机构：Henkel, Feiler & Hänzel
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