Research And Application Of Digital Audio Watermarking System

The development of broadband communication networks and the appearance of multimedia data in a digital format nowadays opened many challenges and opportunities for innovation. Versatile and simple-to-use software and decreasing prices of digital devices have made it possible for consumers to create and exchange ultimedia data. As a kind of protection for intellectual ownership-Watermarking become an important technological and research issue.The main challenge in digital audio watermarking is that if the perceptual transparency parameter is fixed, the design of a watermark system cannot obtain high robustness and a high watermark data rate at the same time. In this thesis, We address three research problems on audio watermarking as follows:(1) How can the detection performance of a watermarking system be improved using algorithms based on communications models for that system?(2) How can overall robustness to attacks to a watermark system be increased using attack characterization at the embedding side?(3) What is the highest watermark bit rate obtainable, under the perceptual transparency constraint, and how to approach the limit?An approach that combined theoretical consideration and experimental validation, including digital signal processing, psychoacoustic modeling and communications theory, is used in developing algorithms for audio watermarking.The main outcome of this thesis is base on analyzing and improving available algorithms, using communication models to increase the detection performance, using Attack characterization section to enhance the robust and an acceptable increase in computational complexity. Thereby develop a novel audio watermarking algorithm, with the state-of-the-art performance .The algorithms' performance is validated in the presence of the standard watermarking attacks. The main technical solutions include algorithms for embedding high data rate watermarks into the host audio signal, using channel models derived from communications theory for watermark transmission and the detection and modeling of attacks using attack characterization procedure. The thesis also includes a thorough review of the state-of-the-art literature in the digital audio watermarking.