| 摘要 |
PROBLEM TO BE SOLVED: To properly detect a digital watermark by improving ruggedness of the digital watermark embedded in processed variously voice contents. SOLUTION: This device is provided with watermark signal detection parts 11 for calculating detected values of a watermark signal by using two or more keys to a PCM data of voice contents for each channel, an adding part 12 of two or more detected values for adding detected values corresponding to each channel and each key at each possible combination of each channel and each key, and a comparison selection part for selecting and outputting one addition result from among each addition result by the adding part 12 of two or more detected values. Moreover, this device is provided with a message reconstruction part 13 which accumulates these detected values at different accumulation cycles and reconstructs a message embedded as a digital watermark from the accumulated detected values and also performs boundary detection of the voice contents, to detect the voice contents in which the digital watermark is embedded, and a detection result output part 14 which synthesizes each result processed by the message reconstruction part 13 and outputs the result. COPYRIGHT: (C)2006,JPO&NCIPI
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