发明名称 |
TLN SIGNAL GENERATING APPARATUS USED IN OPTICAL DISC DRIVE AND OPTICAL DISC DRIVE EQUIPPED WITH THE APPARATUS, AND OPTICAL DISC DRIVE EQUIPPED WITH AMPLITUDE ADJUSTING APPARATUS FOR TRACKING ERROR SIGNAL |
摘要 |
An optical disc drive equipped with a TLN signal generating apparatus is disclosed. The TLN signal generating apparatus includes a TLN signal generating circuit for generating a TLN signal (track loss signal) based on signals obtained from an optical pick-up; a digitizing circuit for digitizing the TLN signal by comparing it with a reference level; and a correction circuit for correcting the TLN signal so that it is accurately digitized by the digitizing circuit irrespective of an offset component which is a direct current component contained in the TLN signal. The correction circuit is comprised of an offset component detecting circuit for detecting a level of the offset component contained in the TLN signal; and a signal control circuit for controlling, responsive to the level of the offset component detected by the offset component detecting circuit, a level of the TLN signal generated by the TLN signal generating circuit so that the level of the TLN signal will become a level which does not receive any influence from the level of the direct component. The correction circuit can also be comprised of a signal correcting circuit which amplifies an alternating current component contained in the TLN signal without eliminating a directed current component contained in the TLN signal.
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申请公布号 |
US6606286(B1) |
申请公布日期 |
2003.08.12 |
申请号 |
US19980223245 |
申请日期 |
1998.12.30 |
申请人 |
MITBURRI ELECTRIC CO., LTD |
发明人 |
MAEKAWA YUICHI |
分类号 |
G11B7/085;G11B7/09;G11B7/095;(IPC1-7):G11B5/09 |
主分类号 |
G11B7/085 |
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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