University of Auckland COMPSYS 401 A Project Audio Watermarking Final Report

An audio watermarking technique based on complementary filter band division is developed by Andrew Sung and me, Dackson Lam, as the final year project. This report presents the workings and results of the project in details. It has shown that audio watermarking is chosen for investigation due to its recentness and importance to the audio recording industry. Then, the report provides the background knowledge of audio watermarking. Then, it examines and compares four audio watermarking methods which are based on DC level shifting, quadrature mirror filter (QMF) bank band division, frequency masking and spread spectrum. The report justifies that the QMF bank scheme is chosen for implementation at first because it is a relatively robust blind watermarking scheme. This scheme is developed to be based on complementary filter bank later because perfect reconstruction of a signal in a QMF bank is not achieved in practice. The results from the evaluation of the developed scheme are presented. It shows that the modified scheme is a successful watermark scheme. Next, the graphical user interface (GUI) created for accessing the watermarking scheme is introduced. At last, the report proposes the possible future improvements such as robustness to different attacks to enhance this watermark scheme. COMPSYS401A Project Dackson LAM Group 61 Audio Watermarking 2536685 Declaration of originality This report is my own unaided work and was not copied from nor written in collaboration with any other person. Signed: ___________________________ COMPSYS401A Project Dackson LAM Group 61 Audio Watermarking 2536685