发明名称 |
Data readout device and data readout method |
摘要 |
A data readout device generates decoded data based on a data bit determined by performing a hard-decision on likelihood data. The likelihood data is generated using an iterative decoding method corresponding to a turbo-coding process. The decoding process is performed on a sampled value obtained by sampling a signal read out from a magneto-optical disk at a predetermined sampling period. A reliability determination part detects whether each obtained data bit was obtained from likelihood data within a predetermined range defined with respect to a histogram of log likelihood ratios. When it is detected that a data bit was obtained by a hard-decision on likelihood data within the predetermined range, the data bit is regarded as being obtained by a hard-decision whose reliability is not sufficient. In this way, the error correcting decoder can perform ECC-based decoding operations including loss-correction processes depending on respective reliability-determination results that distinguish reliabilities among respective data bits.
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申请公布号 |
US7287211(B2) |
申请公布日期 |
2007.10.23 |
申请号 |
US20030339548 |
申请日期 |
2003.01.09 |
申请人 |
FUJITSU LIMITED |
发明人 |
TAGUCHI MASAKAZU;ITAKURA AKIHIRO |
分类号 |
G11B20/10;H03M13/03;G11B20/18;H03M13/00;H03M13/15;H03M13/29;H03M13/41;H03M13/45 |
主分类号 |
G11B20/10 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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