Disc production apparatus, the signal processing circuit, the disk manufacturing method, signal processing method, a disk, an optical disk reproduction apparatus, a demodulation circuit, an optical disk reproducing method and demodulation method

摘要

PROBLEM TO BE SOLVED: To record various data so as to be reproduced by an optical pickup reproducing data column without affecting reproduction of the data column by pit column or the like, to be hardly copied in the case of illegal copy, further, to be hardly found.;SOLUTION: Pits or the like are displaced in the direction of an inner periphery and an outer periphery of an optical disk and sub-data such as key data are recorded, displacement for this sub-data is made by a binary sequence.;COPYRIGHT: (C)2006,JPO&NCIPI