公开(公告)号：EP1052612B1

公开(公告)日：2006-06-07

申请号：EP98911172.9

申请日：1998-04-01

申请人： Kowa Company. Ltd. ,  Matsui, Kineo

发明人： MATSUI, Kineo ,  IWAKIRI, Munetoshi

IPC分类号： G09C5/00 ,  H03M7/30 ,  G10L19/00 ,  G11B20/00

CPC分类号： G11B20/00086 ,  G10L19/018 ,  G10L21/00 ,  G10L25/00 ,  G11B20/00913 ,  H04B1/707

摘要： In order to bury watermark information in an original one-dimensional data, first a 1st spread one-dimensional data x(t) is generated by spreading the spectrum of the original one-dimensional data s(t) by using a PN series g(t). Then the 1st spread one-dimensional data is subjected to modified discrete cosine transformation. The specific frequency component value of the MDCT coefficient is so adjusted as to correspond to the watermark information. By subjecting the adjusted frequency component to the reverse conversion, a 2nd spread one-dimensional data x'(t) is generated. Lastly, by the reverse spectrum-spreading using the same PN series as those used in the spectrum-spreading, watermark one-dimensional data in which the watermark information is buried is generated.

公开(公告)号：EP1052612A1

公开(公告)日：2000-11-15

申请号：EP98911172.9

申请日：1998-04-01

申请人： Kowa Co., Ltd. ,  Matsui, Kineo

发明人： MATSUI, Kineo ,  IWAKIRI, Munetoshi

IPC分类号： G09C5/00 ,  H03M7/30 ,  G10L9/16

CPC分类号： G11B20/00086 ,  G10L19/018 ,  G10L21/00 ,  G10L25/00 ,  G11B20/00913 ,  H04B1/707

摘要： In the process of embedding watermark information in one-dimensional source data, first spread one-dimensional data x(t) is generated by subjecting one-dimensional source data s(t) to spectrum-spreading operation using a PN sequence g(t). This first spread one-dimensional data x(t) then undergoes a modified discrete cosine transformation. A specific frequency component value of the MDCT coefficients is modulated to provide association with the watermark information. The modulated frequency component then undergoes inverse transformation to generate second spread one-dimensional data x'(t). Then, using the same PN sequence in the spreading, the second spread one-dimensional data is subjected to spectrum-despreading to produce digitally watermarked one-dimensional data in which watermark data has been embedded.

摘要翻译： 在一维源数据中嵌入水印信息的过程中，通过使用PN序列g（t）对一维源数据s（t）进行频谱扩展操作来生成第一扩展一维数据x（t） 。 首先扩展的一维数据x（t）然后经历修正的离散余弦变换。 调制MDCT系数的特定频率分量值以提供与水印信息的关联。 调制频率分量然后进行逆变换以产生第二扩展一维数据x'（t）。 然后，在扩展中使用相同的PN序列，对第二扩展的一维数据进行频谱解扩，以产生嵌入了水印数据的数字水印的一维数据。