| 摘要 |
PROBLEM TO BE SOLVED: To provide an electronic watermark encoding device etc., for effectively protecting speech data while freely providing data representing speeches. SOLUTION: A speech data input unit E1 of the electronic watermark encoding device E acquires the speech data representing a speech, and a pitch specifying unit E2 specifies the frequency of a pitch component of the speech; and a BPFE 4 extracts a pitch component having a frequency near the frequency, and a BRFE 3 extracts a non-pitch component. A pitch shift unit E5 shifts the frequency of the pitch component so as to have a pattern representing a value of data to be embedded as an electronic watermark, and an adding unit E6 adds the processed pitch component to the non-pitch component. The electronic watermark decoding device acquires electronically watermarked speech data and extracts a pitch component similarly to the electronic watermark encoding device E, and a pitch array extracting unit specifies embedded data from a pattern of frequency shifting of the pitch component. COPYRIGHT: (C)2007,JPO&INPIT
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