In order to solve digital audio files' copyright protection issue in network, an audio digital watermarking algorithm based on wavelet coefficients energy ratio is proposed. Through the statistics, two adjacent wavelet coefficients energy ratio in every audio section is partitioned into two regions,and the probability of the energy ratio falling in each region is made of 1/2,one region is used to embed bit '0' while the other is used to embed bit '1 '. It's proved by the experiments that the transparency and the robustness of the algorithm is satisfied even in the circumstances of low embedding strength;moreover, the identifiable watermark is still able to be extracted when attacked by re-sampling,re-quantising and random shear attack to a certain extent.%为了解决网络中数字音频文件版权保护这一问题.提出一种基于小波系数能量比的音频数字水印算法,通过统计,把每一段音频中,相邻两段小波系数能量比值划分在两个区域,使得能量比值落在每个区域的概率是1/2,用一个区域嵌入比特‘0',另一区域嵌入比特'1'.经实验分析,该算法即使在嵌入强度低的情况下,也能有比较好的透明性和鲁棒性,在受到重采样、重量化、一定程度的随机剪切等攻击,仍能提取可识别的水印.
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