为了解决现有音频水印算法透明性与鲁棒性之间的矛盾，提出了一种基于DCT系数符号的音频零水印算法。算法按水印尺寸对时域音频数据做等长分帧，求取每帧数据的绝对值平均值，依次按时序做离散余弦变换( DCT)。算法选取数值最大的DCT系数，利用水印属性与最大DCT系数符号做异或运算，得到水印密钥，实现了零水印的嵌入。实验结果表明该算法可以很好地抵抗各类常规的信号处理破坏，水印鲁棒性较强。%In order to solve the contradiction between the transparency and the robustness in the existing audio watermark algorithm,a zero-watermark algorithm based on DCT coefficients processing is proposed. The audio is split into equal frames based on size of watermark, and then calculate the average of the absolute value of each frame and using the average do DCT. The algorithm selects the maximum val-ue of the DCT coefficient,applying the watermark characteristic and maximum value of DCT coefficient for XOR operation to get water-mark key,accomplishing the zero-watermarking embedded. The experimental results show that the algorithm is a strong watermark ro-bustness which can be very good resistance to various types of conventional signal processing.
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