汉明码在数字音频水印嵌入中的应用

Application of Hamming code in digital audio watermarking

汉明码作为一种具有纠错功能的编码技术,在通信领域被广泛研究与应用。为降低水印提取的误码率,文中利用汉明码良好的纠错性能和均值量化的稳定性,提出一种基于汉明码的数字音频水印算法。首先将作为水印信号的二值信号进行汉明编码,并将编码后的汉明码矩阵利用Logistic映射加密,然后将原始音频数据小波变换,通过均值量化将加密后的汉明码嵌入到音频中。实验结果表明,该算法具有较好的透明性,对常规处理具有鲁棒性,有效降低了水印的误码率。

As a coding technique with error correction function,Hamming code is widely studied and applied in the field of communication. To reduce the error rate of watermark extraction,in this paper,using the good performance of Hamming code in error correction and the stability of the mean quantization,a digital audio watermarking algorithm based on Hamming code is proposed. First of all,binary watermark signal is transformed to Hamming code,and encode hamming code matrix by using Logistic mapping encryption. Then the original audio signal is transformed in wavelet domain,and the encoded Hamming code is embedded into audio signal by mean quantization. The experimental results show that the algorithm is inaudible and robust against normal signal- processing operations,the error bit rate of watermark is decreased greatly.