公开(公告)号：US06400658B1

公开(公告)日：2002-06-04

申请号：US09275814

申请日：1999-03-25

申请人： Chang-Jin Yang ,  Pyong-Yong Seong ,  Seong-Sin Joo ,  Soo-Yul Jung ,  Jung-Eon Seo ,  Yong-Jae Lee ,  Jang-Hoon Yoo ,  Tae-Kyung Kim

发明人： Chang-Jin Yang ,  Pyong-Yong Seong ,  Seong-Sin Joo ,  Soo-Yul Jung ,  Jung-Eon Seo ,  Yong-Jae Lee ,  Jang-Hoon Yoo ,  Tae-Kyung Kim

IPC分类号： G11B17221

CPC分类号： G11B27/24 ,  G11B7/005 ,  G11B7/00718 ,  G11B7/00745 ,  G11B19/04 ,  G11B20/18 ,  G11B27/3027 ,  G11B2220/216 ,  G11B2220/2575

摘要： A DVD-RAM disk reproduction apparatus for reducing an error during detection of ID data, which includes a first operational amplifier for obtaining a sum signal resulting from the addition of four picked-up signals picked up by divided-by-four photodiodes from a DVD-RAM disk having a header region and a recording region, second and third operational amplifiers for respectively obtaining two sum signals corresponding to the upper and lower regions of the header region resulting from the addition of the first and second picked-up signals and the third and fourth picked-up signals, respectively, a fourth operational amplifier for obtaining a difference signal between the two sum signals, a header region detector for detecting upper and lower header region signals corresponding to the upper header region and the lower header region based on the difference signal, and detecting a header region signal corresponding to a header region by logically summing the two detected signals, a first multiplexer for selecting one of the two sum signals obtained by the second and third operational amplifiers according to the upper header region signal, and a second multiplexer for selecting the sum signal selected by the first operational amplifier and the sum signal selected by the first multiplexer according to the header region signal, to thereby output the selected result to an equalizer. Thus, during detection of ID data in a header region, a difference signal between the picked-up four signals is not used, but a signal resulting from the addition of two signals among the picked-up signals according to the corresponding upper and lower regions of the header region is selectively used. Accordingly, ID data can be detected from a signal without deterioration, to thereby reduce an error and thus improve a detection margin.

摘要翻译： 一种用于在ID数据检测期间减少误差的DVD-RAM盘再现装置，其包括第一运算放大器，用于获得由DVD的四分之一光电二极管拾取的四个拾取信号的相加而得到的和信号 -RAM盘，具有标题区域和记录区域，第二和第三运算放大器，用于分别获得对应于由所述第一和第二拾取信号的相加产生的标题区域的上部和下部区域的两个和信号，以及第三个 和第四拾取信号，分别用于获得两个和信号之间的差分信号的第四运算放大器，用于检测对应于上标题区域和下标题区域的上标题区域信号和下标头区域信号的标题区域检测器， 差分信号，并且通过对两个检测到的信号进行逻辑求和来检测与标题区域相对应的标题区域信号，第一个mul 层叠器，用于根据上标头区域信号选择由第二和第三运算放大器获得的两个和信号之一;以及第二多路复用器，用于选择由第一运算放大器选择的和信号和由第一多路复用器选择的和信号， 到标题区域信号，从而将所选择的结果输出到均衡器。 因此，在标题区域中的ID数据的检测期间，不使用拾取的四个信号之间的差分信号，而是根据相应的上部和下部区域在拾取信号之间添加两个信号而产生的信号 选择使用标题区域。 因此，可以从信号中检测ID数据而不劣化，从而减少误差，从而提高检测余量。