发明名称 |
Disk drive and pre-pit detection method |
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.
|
申请公布号 |
US2004136284(A1) |
申请公布日期 |
2004.07.15 |
申请号 |
US20030673193 |
申请日期 |
2003.09.30 |
申请人 |
SONY CORP |
发明人 |
SANO TATSUSHI;BAMBA MITSUYUKI;MIYOSHI TOSHIMASA |
分类号 |
G11B20/10;G11B7/00;G11B7/004;G11B7/005;G11B7/09;G11B19/00;G11B27/19;G11B27/24;(IPC1-7):G11B7/00 |
主分类号 |
G11B20/10 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|