摘要
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.
出处
《计算机工程与设计》
CSCD
北大核心
2013年第1期32-36,共5页
Computer Engineering and Design
基金
国家自然科学基金项目(61071196
61102131)
教育部新世纪优秀人才支持计划基金项目(NCET-10-0927)
信号与信息处理重庆市市级重点实验室建设基金项目(CSTC2009CA2003)
重庆市杰出青年基金项目(CSTC2011jjjq40002)
重庆市自然科学基金项目(CSTC2009BB2287
CSTC2010BB2398
CSTC2010BB2409
CSTC2010BB2411)
关键词
音频水印
特博码
交织器
突发错误
鲁棒性
audio watermarking
turbocode
interleaver
burst error
robustness