公开(公告)号：US5966357A

公开(公告)日：1999-10-12

申请号：US883706

申请日：1997-06-27

申请人： Jai-Choon Ryoo

发明人： Jai-Choon Ryoo

IPC分类号： G11B7/00 ,  G11B7/0037 ,  G11B7/004 ,  G11B7/005 ,  G11B7/085 ,  G11B7/09 ,  G11B19/12 ,  G11B3/90

CPC分类号： G11B19/12 ,  G11B7/0037 ,  G11B7/0945

摘要： A disk discrimination method for a digital versatile disk (DVD) system uses a sum signal and a focus error signal as a difference signal obtained from the amount of light detected from divided optical detection areas of a divided-by-eight photodiode in a loaded disk, to discriminate whether a loaded disk is a DVD or compact disk (CD). When offsets of the sum signal and the focus error signal are normal, and are larger than predetermined reference signals, it is judged that the loaded disk is a DVD, while the loaded disk is judged to be a CD when the sum signal and the focus error signal are smaller than the reference signals. When disk type discrimination fails, an optical pickup moves a predetermined number of times to retry discrimination. Such discrimination method increases reliability of the discrimination results.

摘要翻译： 用于数字通用盘（DVD）系统的盘识别方法使用和信号和聚焦误差信号作为从在加载盘中的八分之一光电二极管的分割光检测区域检测的光量获得的差信号 以鉴别加载的盘是DVD还是光盘（CD）。 当和信号和聚焦误差信号的偏移正常并且大于预定的参考信号时，判断装入的盘是DVD，而当和信号和焦点被判定为CD时 误差信号小于参考信号。 当盘类型识别失败时，光学拾取器移动预定次数以重试鉴别。 这种辨别方法提高了辨别结果的可靠性。