发明名称 |
Data writing density judging apparatus and method |
摘要 |
An improved data writing density judging apparatus and method for a disc capable of judging a writing density of a disc by detecting an amount of cross talk or detecting a tracking error signal. Cross talk is detected when a disc track is scanned by a beam. A tracking error signal is detected when a pick-up member jumps a certain track while the pick-up member moves across a disc track. The improved apparatus and method computes a ratio between a minimum value and a maximum value of an envelope signal based on the detected amount of cross talk a writing density can be determined. The improved apparatus and method also converts a tracking error signal which is a high frequency analog signal into a digital signal that is used to compute a time required for a pick-up member to jump a certain track. Based on the computed time which is compared with a reference value, a writing density of a disk can also be determined.
|
申请公布号 |
US5774438(A) |
申请公布日期 |
1998.06.30 |
申请号 |
US19950550652 |
申请日期 |
1995.10.31 |
申请人 |
LG ELECTRONICS, INC. |
发明人 |
PARK, CHONG YEOP;NAM, CHANG WOO;LEE, JONG JUN |
分类号 |
G11B7/0037;G11B7/085;G11B19/12;(IPC1-7):G11B3/90 |
主分类号 |
G11B7/0037 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|