发明名称 |
Reproduced signal evaluation apparatus and method, reproduction apparatus and method, and recording apparatus and method |
摘要 |
The present invention provides an apparatus and a method for precisely and adequately evaluating actual quality of reproduced data whenever applying a maximum likelihood decoder for converting signal reproduced from a recording medium into binary signal Based on data arrays of a pair of binary data outputted from a "Viterbi" decoder, SAM values are secured by selecting any of path-metric differential values (00) and (11) being the difference between a pair of values compared when renewing path-metric values PMM (00) and (11) outputted from the "Viterbi" decoder. The minimum SAM value for an ideally-reproduced signal is outputted from a constant generating circuit. If the SAM values are verified as valid, and yet, if the SAM values coincide with the equation "input SAM values"<="data value outputted from the constant generating circuit", then squared values outputted from a square circuit are averaged by an averaging circuit. Finally, the average value is outputted as the reproduced signal evaluation.
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申请公布号 |
US7200094(B2) |
申请公布日期 |
2007.04.03 |
申请号 |
US20050113557 |
申请日期 |
2005.04.25 |
申请人 |
SONY CORPORATION |
发明人 |
FUJIMOTO KENSUKE;YOSHIMURA SHUNJI;FUKUMOTO ATSUSHI;TANAKA YASUHITO |
分类号 |
G11B5/76;G11B7/0045;G11B7/005;G11B20/10;G11B20/18;H03M13/39;H03M13/41 |
主分类号 |
G11B5/76 |
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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