| 摘要 |
PROBLEM TO BE SOLVED: To provide electronic watermark technique, applied to an analog acoustic signal and a digital acoustic signal which prevents an acoustic signal, including an electronic watermarking from deteriorating in sound quality when heard, and also improves articulation of an acoustic signal having been processed, by incorporating an electronic watermark and discriminating performance.SOLUTION: Envelope information and spectrum information are generated from a special harmonic group obtained by controlling a delay time which is sufficient to induce Haas Effect (time discrimination) as an amplitude function of an acoustic signal, and multiplied by data in a storage memory of the electronic watermark, a pseudo-harmonic components are regenerated and added to the acoustic signal, and division (multiplication with coefficient inversion) of a false harmonic component region is performed during reproduction to demodulate an electronic watermark code (WM code). |
