Abstract
In this paper, a robust and perceptually transparent single-level and
multi-level blind audio watermarking scheme using wavelets is proposed. A
randomly generated binary sequence is used as a watermark, and wavelet
function coding is used to embed the watermark sequence in audio signals.
Multi-level watermarking is used to enhance payload capacity and can be
used for a different level of security. The robustness of the scheme is
evaluated by applying different attacks such as filtering, sampling rate
alteration, compression, noise addition, amplitude scaling, and cropping.
The simulation results obtained show that the proposed watermarking scheme
is resilient to various attacks except cropping. Perceptual transparency
of watermark is measured by using Perceptual Evaluation of Audio Quality
(PEAQ) basic model of ITU-R (PEAQ ITU-R BS.1387) on Speech Quality
Assessing Material (SQAM) given by European Broadcasting Union (EBU).
Average Objective Difference Grade (ODG) measured for this method is
-0.067 and -0.080 for single-level and multi-level watermarked audio
signals, respectively. In the proposed single-level digital audio
watermarking scheme, the payload capacity is increased by 19.05% as
compared to the single-level Chirp-Based Digital Audio Watermarking
(CB-DAWM) scheme.
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