一個改進的基于直流電平偏移的音頻水印算法

根據水印調整直流電平偏移的音頻水印算法具有很好的低通和杭噪性能當水印發生去同步時，如果同步點偏移不大，直流電平的符號不會改變，但當同步點偏移很大時，直流電平可能變號，從而導致水印提取錯誤。為此，提出了在宿主音頻中嵌入同步訓練序列的抵制去同步攻擊的改進算法實驗結果表明，算法對隨機裁剪等去同步攻擊的魯棒性得到了明顯提高.

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.