Watermark data embedding apparatus and extracting apparatus

Details Watermark data embedding apparatus and extracting apparatus Watermark data embedding apparatus and extracting apparatus

2003-02-11

2008-05-06

Vu, Kim (Department: 2135)

Electrical computers and digital processing systems: support

Multiple computer communication using cryptography

Particular communication authentication technique

C713S179000, C713S180000, C380S236000, C380S237000, C382S207000, C382S270000, C382S273000

Reexamination Certificate

active

07370204

ABSTRACT:
By a program process, CPU31embeds a watermark data into a waveform data stored in wave memory41a. The program includes a step for detecting a characterizing part (attack part and loop part) of a waveform data that represents a waveform of a musical tone where the characterizing part represents characteristics of the musical tone, and a step for embedding a watermark data into a part of the waveform data excluding the detected characterizing part. Further, CPU31can also extract the watermark data by a program process including a step for detecting the characterizing part and a step for extracting the watermark data embedded in a part excluding the detected characterizing part. Thus, from waveform data including a watermark data, natural musical tones can be reproduced without deteriorating the characteristics of the musical tones at the time of reproduction.

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