发明名称 |
Disc player having a prepit detecting circuit |
摘要 |
A disc player having a prepit detecting circuit which can correctly detect prepits even if phases or amplitude levels of a plurality of read signals read out from a recording disc are deviated from each other. A phase difference between a first read signal and a second read signal read out by first and second reading elements arranged in two regions divided along the direction of recording tracks of a recording disc is detected. A first phase correction read signal is obtained by adjusting the phase of the first read signal by an amount according to the phase difference. A differential value between the first phase correction read signal and the second read signal is outputted as a prepit detection signal.
|
申请公布号 |
US6339581(B1) |
申请公布日期 |
2002.01.15 |
申请号 |
US19990425178 |
申请日期 |
1999.10.22 |
申请人 |
PIONEER CORPORATION |
发明人 |
YOSHIDA MASAYOSHI;SHIMODA YOSHITAKA;YANAGAWA NAOHARU;NAGAHARA SHINICHI |
分类号 |
G11B7/00;G11B7/0045;G11B7/005;G11B7/007;(IPC1-7):G11B7/00 |
主分类号 |
G11B7/00 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|