A digital audio watermark embedded scheme based on spread spectrum in time-domain and frequency-domain is overview. A conclusion that the length of pseudorandom sequence and height correlation of audio carrier directly impact the false-alarm and false dismissal probability of detection is obtained by analysing the statistical characteristics of coherent detection. The correctness of the above-mentioned conclusion was proved by experiment and simulation. The common whitening filters are concluded. The synchronization difficulty of the spread-spectrum digital audio watermark is discussed in this paper. The problems existing in current technology are summarized and the prospect of the future development in this field is pointed out.%论述了时域、频域的扩频数字音频水印嵌入方案.通过分析相关检测的统计特性,得出伪随机序列的长度与音频载体本身的高度相关性直接影响检测的虚警和漏警概率,且通过实验仿真验证了上述结论的正确性,并归纳了目前常用的白化滤波器.讨论了扩频数字音频水印的同步问题,最后总结了当前存在的问题并对其发展进行了展望.
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