发明名称 |
Method of vertical deviation disc detection |
摘要 |
A method for detecting whether vertical deviation of an optical disc occurs is provided. First, before a pickup head is successfully focused on the optical disc, a pickup head is actuated based on an input control signal so as to generate a focus error signal with a plurality of S-curves. Then, a plurality of zero crossing points of the S-curves in the focus error signal is identified and a plurality of input control values respectively corresponding to the zero crossing points is obtained. A variation of the input control values is then calculated. Whether vertical deviation of the optical disc occurs can be determined according to the variation of the input control values.
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申请公布号 |
US8345520(B2) |
申请公布日期 |
2013.01.01 |
申请号 |
US201113334362 |
申请日期 |
2011.12.22 |
申请人 |
MEDIATEK, INC.;WU SHANG-WEI;HO HSU-FENG |
发明人 |
WU SHANG-WEI;HO HSU-FENG |
分类号 |
G11B7/00;G02B7/04;G02B27/40;G11B7/0037;G11B7/09;G11B7/095;G11B27/36 |
主分类号 |
G11B7/00 |
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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