发明名称 |
Disc discriminating method and information reproducing apparatus using thereof |
摘要 |
The invention relates to a disc discriminating method and an optical disc information reproducing apparatus wherein DVD-RAM which is DVD-RAM1 or DVD-RAM2 and DVDRW which is DVD-RW or DVD+RW which cannot be respectively determined based upon distance from the surface of a disc to the recording face, the number of recording faces and the reflectance can be discriminated. In case an optical disc is DVD-RAM or DVDRW, the amplitude of a push-pull tracking error signal is measured by a microcomputer in a state in which servo control is executed based upon a focus error signal. Determination is performed based upon the amplitude of the push-pull tracking error signal, when the amplitude of the push-pull tracking error signal is larger than a predetermined value, the optical disc is judged as DVD-RAM and when the amplitude is smaller than the predetermined value, the optical disc is judged as DVDRW.
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申请公布号 |
US2002150017(A1) |
申请公布日期 |
2002.10.17 |
申请号 |
US20010910586 |
申请日期 |
2001.07.20 |
申请人 |
ONO KAZUHIKO;FUKUDA HIROTOSHI;IKEDA TAKESHI |
发明人 |
ONO KAZUHIKO;FUKUDA HIROTOSHI;IKEDA TAKESHI |
分类号 |
G11B19/12;G11B5/09;G11B7/00;G11B7/004;G11B7/005;G11B7/085;G11B7/09;(IPC1-7):G11B7/00 |
主分类号 |
G11B19/12 |
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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