Being the information pad device which modulates the aforementioned contents data on the basis of the pad data where the information pad device and the information extracting equipment,

摘要

PPROBLEM TO BE SOLVED: To suppress the degradation in quality of container signals when embedding information while maintaining versatility for applicability to various container signals and to correctly judge a synchronous state of embedded data. PSOLUTION: Besides configurations of an information embedding device and an information extraction device, an embedded data string for use is provided with a non-modulation section (X) wherein data are not embedded, as a section for synchronization. For example, one left section out of 9 sections equal to one period is used as the section wherein data are not embedded (a non-modulation section for synchronization), and the other 8 sections are used as sections for symbol embedding. Since signal modulation processing is not performed for the non-modulation section, the number of embedded symbols is 0 in the non-modulation section for synchronization and is not 0 in the other sections when statistics of the numbers of embedded symbols are collected per period. Thus the use of the non-modulation section for synchronization reduces the degradation in quality to allow a synchronous state to be correctly judged. PCOPYRIGHT: (C)2008,JPO&INPIT