To robustly and inaudibly embed copyright information as watermark into music, a two channel digital audio watermarking system based on the Least Significant Bit (LSB) method and Echo Hiding (EH) with new Exponential Time-spread Echo Kernel (ETEK) is proposed. Owing to complementary combination of the LSB method and EH, the proposed system exhibits robustness against various attacks. Furthermore, the proposed ETEK for EH, which creates multiple echoes as reverberation in a real room, makes the sound of the watermarked music more natural than the one obtained by the conventional single echo kernel. Experiments of extracting watermarks from watermarked clips which are processed through various attacks show that the proposed system obtains higher watermark detection rate, or robustness, 26.09% higher than the LSB method and 7.42% higher than EH, moreover, robustness of the proposed ETEK also increases 14% higher than that of the conventional EH. These results of robustness, together with subjective evaluations of sound quality confirm the internet availability in business of the proposed system.
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