基于Turbo码的抗干扰音频水印算法

Algorithm of anti-jamming audio watermark based on Turbo code

提出了一种基于Turbo码的抗干扰音频水印算法。该算法在水印嵌入之前先利用Turbo码对一维化后的水印序列进行编码,将编码后的码字序列嵌入到小波变换的低频系数做奇异值分解后的对角矩阵中。在水印提取时采用Turbo迭代译码算法进行译码得到水印序列,文中编译码部分是在传统的Turbo码外部加入了另一个伪随机交织器来达到抵抗突发错误的目的。仿真实验表明,该算法不仅对一般的随机错误有很强的鲁棒性,而且对突发错误也有一定的鲁棒性。

An algorithm of anti-jamming audio watermark based on Turbo code is presented. Firstly, the decreased dimen- sional watermark sequence with turbo code is encoded, then the watermark sequence is embedded into the diagonal matrix which are decomposed by the singular value using low frequency coefficients after the wavelet transform. Finally, we can get the watermark sequence during the watermark extraction, decoding with Turbo iterative decoding algorithm. A pseu- do random interleaver is attached on the turbo encoder to enhance the robustness of anti burst errors. Simulation results show that the algorithm has strong robustness on anti-general random errors attack and good robustness on anti-burst er- rors attack.