发明名称 |
Disk drive and detection method using pre-pit detection and push-pull signal generation |
摘要 |
A push pull signal is detected from a disk-shaped storage medium on which wobbling grooves are formed as recording tracks and address information is recorded by forming pre-pits on lands between adjacent grooves. The detected push-pull signal is compared with a reference voltage thereby generating a land pre-pit detection signal. Of pulses included in the land pre-pit detection signal, those pulses having a small pulse width are regarded as noise pulses and removed thereby obtaining a corrected land pre-pit detection signal. The number of pulses included in the land pre-pit detection signal is counted, and the reference voltage is controlled in accordance with the counted number of pulses.
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申请公布号 |
US7304923(B2) |
申请公布日期 |
2007.12.04 |
申请号 |
US20030673193 |
申请日期 |
2003.09.30 |
申请人 |
SONY CORPORATION |
发明人 |
SANO TATSUSHI;BAMBA MITSUYUKI;MIYOSHI TOSHIMASA |
分类号 |
G11B7/00;G11B20/10;G11B7/004;G11B7/005;G11B7/09;G11B19/00;G11B27/19;G11B27/24 |
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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