Audio Watermarking Using Psychoacoustic Models

การทำลายน้ำสัญญาณเสียงโดยอาศัยหลักการไซโคอะคูสติก

Name: Sukhanittha Poomdaeng

Organization : King Mongkut's University of Technologhy Thonburi. Faculty of Engineering. Computer Engineering

keyword: Audio Watermarking

; การทำลายน้ำสัญญาณเสียง

Abstract: Audio watermarking using psychoacoustic models is proposed in this special projectstudies. The additive watermarking technique is used to embed a unique pseudo-randomsequence, considered as a watermark, into the transformed domain of audio signal. Inthe embedding process, the discrete wavelet transform is first applied to the audio signalto obtain the watermarking media, i.e. the DWT coefficients. The watermark strength isthen properly adjusted based on weighting factors, which are derived from twopsychoacoustic models, before directly embedding into the DWT coefficients. Based onthe fact that the human ear is less sensitive to high frequency components, the energy ofwatermark to be embedded in such regions can be increased without any perceptibleeffect. The strength of watermark is then modified according to the DWT coefficientsobtained from levels of wavelet transform. Furthermore, since the human ear is lesssensitive to noises contained within the rich details audio signal, the watermark strengthis thus modified according to the variance of the DWT coefficients at various subbands.In the experiments, we examine several versions of the watermarked audio obtainedfrom both embedding schemes, i.e. with and without psychoacoustic models, by thesubjective listening tests. After various types of attacks, e.g. compression at differentlevels, are applied, the experimental results show that at the equivalent quality of thewatermarked audio, judged by the human hearing system, the audio watermarking withpsychoacoustic yields higher robustness against attacks.

King Mongkut's University Technology Thonburi. Library

Address: กรุงเทพมหานคร (Bangkok)

Email: info.lib@mail.kmutt.ac.th

Name: Thumrongrat Amornraksa

Role: Advisor

Created: 2004

Issued: 2007-06-19

Modified: 2007-07-20

วิทยานิพนธ์/Thesis

ISBN: 9741844999

CallNumber: CPE562

eng

DegreeName: Master of Engineering

Level: Master's Degree

Descipline: Computer Engineering

Grantor: King Mongkut's University of Technology Thonburi

©copyrights King Mongkut's University of Technology Thonburi

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