Dynamic information storage or retrieval – Binary pulse train information signal – Including sampling or a/d converting
Reexamination Certificate
2009-02-27
2011-11-29
Edun, Muhammad N (Department: 2627)
Dynamic information storage or retrieval
Binary pulse train information signal
Including sampling or a/d converting
C369S059230, C369S059260, C369S047100
Reexamination Certificate
active
08068399
ABSTRACT:
A signal evaluation method according to the present invention is a method for evaluating a read signal, retrieved from an information recording medium, based on a binarized signal generated from the read signal by a PRML method. The method includes the steps of: detecting the patterns of multiple paths associated with the binarized signal and merging into the same state; getting the ideal value of a correct pattern associated with the binarized signal and that of an erroneous pattern that is similar to, but different from, the correct pattern; calculating the difference between a distance from the ideal value of the correct pattern to the read signal and a distance from that of the erroneous pattern to the read signal; calculating, based on the difference, an expected error rate for each predetermined group of patterns by the PRML method; and calculating a standard deviation that is associated with a total error rate, which is obtained by adding together the error rates of the predetermined groups of patterns, and that is used for evaluating the read signal.
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Hino Yasumori
Kimura Naohiro
Miyashita Harumitsu
Nakata Kohei
Edun Muhammad N
Panasonic Corporation
Renner , Otto, Boisselle & Sklar, LLP
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