一种基于ITSEH的音频水印算法的研究与仿真  

Research and Simulation on Audio Watermarking Using Improved Time Spread Echo Hiding

作　　者：毛力[1,2] 樊养余[1] 王慧琴[2] 王可[2] 

机构地区：[1]西北工业大学电子信息学院,陕西西安710072 [2]西安建筑科技大学信息与控制工程学院,陕西西安710055

出　　处：《计算机仿真》2014年第5期175-178,204,共5页Computer Simulation

基　　金：国家863计划资助项目(2007AA01Z324);教育部高校回国人员扶持基金项目(K05055);陕西省教育厅产业化项目(2011JG12);陕西省教育厅专项科研项目(11JK1048)

摘　　要：针对版权保护问题,提出了一种基于改进型时域扩展回声隐藏(Improved Time Spread Echo Hiding,ITSEH)的盲音频水印算法。运用混沌映射对水印序列加密生成水印信号,使用改进的PN(Pseudo Noise)序列构造幅频响应较小的回声核,基于心理声学模型实现水印嵌入强度的自适应,利用复倒谱分析中相关函数的峰值特性改进水印信号的提取方法,并通过混沌映射解密为表征版权的水印序列。理论分析和仿真表明改进算法提高了水印的不可感知性和鲁棒性。This paper presented a blind audio watermarking algorithm based on Improved Time Spread Echo Hiding （ITSEH）. The application of chaotic mapping results in watermark. The improved Pseudo Noise （PN） sequence yields an echo kernel whose magnitude response has smaller magnitudes in the perceptually significant region. The psychoacoustics model ensures that the embedded watermark in the original audio is self-adaptive. The correlation function has more large peaks from which a modified decoding function was derived, then watermark bits were decrypted to derive the actual watermark sequence by utilizing chaotic mapping. Theoretical analysis and simulation examples illustrate that the algorithm improves both the imperceptibility and robustness of watermarks.

关 键 词：音频水印 时域扩展回声隐藏 心理声学模型 复倒谱分析 混沌映射 

分 类 号：TP391.9[自动化与计算机技术—计算机应用技术]