Information estimation method, information recording/reproducing equipment, information reproducing equipment and information recordingmedium

A technology for signal evaluation and recording media, applied in optical recording/reproduction, digital recording/reproduction, digital signal error detection/correction, etc. It can solve the problems of inability to evaluate signal quality and inability to accurately estimate error rate, etc.
CN100423115CInactive Publication Date: 2008-10-01KK TOSHIBA +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
KK TOSHIBA
Publication Date
2008-10-01
Estimated Expiration
Not applicable · inactive patent

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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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Description

technical field

[0001] The present invention relates to a signal evaluation method for evaluating a signal reproduced from an information recording medium, an information recording / reproducing apparatus, and an information recording medium. More specifically, the present invention relates to improvements in an evaluation device and evaluation method for reproducing a signal from an information recording medium and evaluating the reproduced signal. Background technique

[0002] As a signal processing procedure performed by an information recording / reproducing apparatus, a PRML (Partial Response and Maximum Likelihood) discrimination method is known in the technical field.

[0003] KOKAI Japanese Patent Application Publication No. 2002-358738 discloses a technique for evaluating signal quality in a system employing the PRML authentication method.

[0004] According to the technique publicly disclosed by KOKAI, a differential metric distribution is prepared. Based on the assu...

Claims

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