Digital Audio Watermarking Based On Wavelet Transform And Phase Modulation

The digital media has become a main way for information communication along with the rapid development of digital technology and computer networks. However, the currently rapid development of digital signal processing and internet transmission techniques have threatened the copyright of digital data severely. Therefore how to effectively protect the copyright of digital products in an open network environment becomes an attractive topic.Traditional information security system can only safeguard information transmitting process, but can't control the decoded media data. So it can't prevent the illegal copy of the private. As a novel way to solve these problems, digital watermarking technology begins to be popularly researched and used.Digital watermark is the most active of the hiding technologies. The technology embeds some data into a carrier data, and this data can be checked with some methods. There're some rules about the watermarking that would be used to protect the copyright of the data. The embedded information should not interface the carrier data be used in gear, which is named invisible. Also, the carrier data might be compressed or be processed so as to suit many requirements. Even under these situations, the watermark should still be checked, which is called as robustness. By several years hard investigate, it have been proved that watermark techniques must be noninvertible, otherwise, the singleness of the embedded information would can not be guaranteed.The emphasis of this thesis is some new algorithms about audio watermarking. Firstly, this paper introduces the development and some related concepts of digital watermarking, which elucidates the background and significance of the research. Secondly, the fundament and general framework of watermark are stated and basic demands are listed. Then based the previous work and current research situation (such as HAS), two audio watermarking schemes are presented.1) The first is An Adaptive Audio Digital Watermarking Based on DWT. Initial audio information should be transformed by DWT, firstly. And then, the location of embedding watermark would be selected based on human auditory system (HAS). The watermark is embedded into the audio signal by quantifying some of its coefficients...