一个改进的基于直流电平偏移的音频水印算法根据水印调整直流电平偏移的音频水印算法具有很好的低通和杭噪性能当水印发生去同步时，如果同步点偏移不大，直流电平的符号不会改变，但当同步点偏移很大时，直流电平可能变号，从而导致水印提取错误。为此，提出了在宿主音频中嵌入同步训练序列的抵制去同步攻击的改进算法实验结果表明，算法对随机裁剪等去同步攻击的鲁棒性得到了明显提高.A udiow atermarkingt hatm odulatesD C levels hift accordingt o watermark has wonderful low pass and noise resistance performance . When loss of watermarking synchronization occurs, if the shift of synchronization position is trivial, the sign of DC level will not be changed, but if notable, the sign of DC level will be changed, as result watermarking extracting error occurs. In order to resist de-synchronization attacks, an improved algorithm that embeds training sequence in cover audio is proposed. Experimental results show that this technique obviously improves the watermarking robustness resistance to de-synchronization attacks.
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