Patent ID: 6425082
Filing Date: 2002-07-23
Classification: G10L,G11B,H04B

Abstract:
A method for embedding watermark information in one-dimensional source data, comprising the steps of:(a) performing spectrum-spreading by an operation equivalent to multiplying the one-dimensional source data by a specific positive/negative value sequence that randomly assumes positive/negative values having a specific absolute value, thereby generating first spread one-dimensional data; (b) subjecting the first spread one-dimensional data to orthogonal transformation; (c) modulating a specific frequency component value of transform coefficients obtained through the orthogonal transformation to provide association with the watermark information; (d) subjecting the modulated frequency component to inverse orthogonal transformation to generate second spread one-dimensional data; and (e) performing spectrum-despreading on the second spread one-dimensional data using the specific positive/negative value sequence to generate digitally watermarked one-dimensional data in which the watermark information has been embedded.