Watermarking of audio signals through changing the phase of their maskers

Authors:
Radek Zezula;Jiří Mišurec
Affiliations:
Department of Telecommunications, Brno University of Technology, Brno, Czech Republic;Department of Telecommunications, Brno University of Technology, Brno, Czech Republic
Venue:
CSECS'08 Proceedings of the 7th conference on Circuits, systems, electronics, control and signal processing
Year:
2008

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Abstract

This article deals with audio signal watermarking as an alternative to securing the copyright of authors of digital audio data. The proposed method exploits tonal and non-tonal components in audio signal to determine suitable phase components for their modification during digital watermark embedding. This method is robust enough as regards loss compression algorithms, which exploit the masking threshold for audio signal compression. This is due to the fact that the embedded watermark is above the level of the masking curve (which is determined just from tonal and nontonal components) and so the watermark is not removed by the effect of a loss compression algorithm. At the same time, the watermark preserves a really low level of watermark-to-signal ratio (WSR), whereby its imperceptibility in watermarked data is guaranteed.