发明名称 |
Dual CD/DVD player with automatic disc identification |
摘要 |
An apparatus for playing back an optical recording medium automatically and quickly identifies the kind of optically recorded disc (CD or DVD) loaded in the apparatus. After a disc to be checked has been loaded in the apparatus, the disc is first driven in a DVD servo mode. If a peak value of a focus error signal detected in this mode is larger than a threshold value, the checked disc is recognized as a DVD. If the detected peak value of the focus error signal is smaller than the threshold value, the checked disc is thereafter driven in a CD servo mode. The checked disc is recognized as a CD if a peak value of a focus error signal detected in this mode is larger than a threshold value, which may be different from the above-mentioned threshold value.
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申请公布号 |
US5986985(A) |
申请公布日期 |
1999.11.16 |
申请号 |
US19970969641 |
申请日期 |
1997.11.13 |
申请人 |
ALPINE ELECTRONICS, INC. |
发明人 |
KAWAMURA, HISATOSHI;UEKI, JIRO |
分类号 |
G11B7/0037;G11B7/004;G11B7/09;G11B7/135;G11B7/20;G11B19/12;(IPC1-7):G11B7/00;G11B3/90 |
主分类号 |
G11B7/0037 |
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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