Applied Digital Watermarking System on Digital Audio Signals

• Main Authors: Lee Jia Wei, 李家維
• Other Authors: Chang Long Wen
• Format: Others
• Language: zh-TW
• Published: 2003
• Online Access: http://ndltd.ncl.edu.tw/handle/25402823015561461414

碩士 === 國立清華大學 === 資訊工程學系 === 91 === In this thesis, we propose a digital watermarking scheme applied to digital audio signals to protect copyright. This watermark can be a 2D logo, a barcode image, or other information about the music. To satisfied two main features: inaudibility and robustness, we works on frequency domain. In this system, we do block DCT to original digital audio signal and embed watermarks into the coefficients. In order to get the embedded watermark in the correct position, we add a small signal in front of blocks for synchronization. We test this scheme under common audio editing processing, like re—sampling, re—resolution, and MP3 compression. Experiments show that we can extract watermark correctly in most situations, especially in MP3 compression.