发明授权
- 专利标题: Signal evaluation method and signal evaluation apparatus
- 专利标题(中): 信号评估方法及信号评估装置
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申请号: US12394281申请日: 2009-02-27
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公开(公告)号: US08068399B2公开(公告)日: 2011-11-29
- 发明人: Harumitsu Miyashita , Kohei Nakata , Yasumori Hino , Naohiro Kimura
- 申请人: Harumitsu Miyashita , Kohei Nakata , Yasumori Hino , Naohiro Kimura
- 申请人地址: JP Osaka
- 专利权人: Panasonic Corporation
- 当前专利权人: Panasonic Corporation
- 当前专利权人地址: JP Osaka
- 代理机构: Renner, Otto, Boisselle & Sklar, LLP
- 主分类号: G11B5/09
- IPC分类号: G11B5/09
摘要:
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.
公开/授权文献
- US20090225639A1 SIGNAL EVALUATION METHOD AND SIGNAL EVALUATION APPARATUS 公开/授权日:2009-09-10