Title: Method for protecting audio data
Application Number: 200310111929 Application Date: 2003.10.29
Publication Number: 1540600 Publication Date: 2004.10.27
Approval Pub. Date: Granted Pub. Date: 2005.12.14
International Classifi-cation: G09C5/00,G11B20/10
Applicant(s) Name: Zhongshan Univ. Address: 510275
Inventor(s) Name: Wu Shaoquan, Huang Jiwu
Attorney & Agent:
Abstract:
     In the invention, using wavelet transform decomposes digital audio data, and pretreatment is carried out for watermark by scrambling and dimension reduction method. Synchronizing signal and treated watermark are embedded into low-frequency range of wavelet transform. Finally, audio containing synchronizing signal and watermark is obtained after wavelet inverse transform. Comparing with original audio data, human auditory system cannot make difference between them. But, procedure of picking up watermark can track audio data or declare ownership. Watermark can be any meaningful self-defined information. The invention protects audio data or file transferred on network.
Time: 11