By Yiqing Lin, Waleed H. Abdulla
This e-book illustrates the generally used and novel methods of audio watermarking for copyrights defense. the writer examines the theoretical and sensible step-by-step consultant to the subject of knowledge hiding in audio sign akin to song, speech, broadcast. The publication covers new strategies built through the authors are absolutely defined and MATLAB courses, for audio watermarking and audio caliber tests and in addition discusses tools for objectively predicting the perceptual caliber of the watermarked audio signals.
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Additional info for Audio Watermark: A Comprehensive Foundation Using MATLAB
N/2 is the Robustness Test The goal of the robustness test is to test the ability of a watermarking system resistant to signal modifications in real applications. In the robustness test, various attacks are applied to the watermarked signal and produce a number of attacked signals. Then, watermark detection is performed on each attacked signal to check whether the embedded watermark survives or not. 4) A competent robustness test should comprise an extensive range of possible attacks. e. SDMI standard, STEP 2000 and StirMark for Audio, which are described in Appendix A, B and C respectively.
In psychoacoustic modelling, we use empirically determined masking models to analyze which frequency components contribute more to the masking threshold and how much “noise” can be mixed in without being perceived. This notion is applicable to audio watermarking, of which the imperceptibility is one prerequisite. Typically, in some audio watermarking techniques such as spread spectrum watermarking [74, 75] and wavelet domain watermarking [7, 76], the watermark signal is added to the host signal as a faint additive noise.
It is equal to 12 dB for bit rates no less than 96 kbits=s and 0 dB for bit rates less than 96 kbits=s per channel . Sound tracks used in our experiments are of CD quality, whose bit rates are normally greater than 96 kbits=s. Therefore, by comparing Fig. 19 to Figs. 8, the threshold in quiet in Fig. 19 is shifted downward by 12 dB. , noise-like) maskers. k/. 12) 38 2 Principles of Psychoacoustics a Initial PSD Normalized PSD Threshold in Quiet Sound pressure level (dB) 100 50 0 −50 −100 −150 0 4000 8000 12000 16000 20000 Frequency (Hz) b Initial PSD Sound pressure level (dB) 100 Normalized PSD Threshold in Quiet 50 0 −50 −100 −150 1 3 5 7 9 11 13 15 17 19 21 23 25 Critical band rate (Bark) Fig.
Audio Watermark: A Comprehensive Foundation Using MATLAB by Yiqing Lin, Waleed H. Abdulla