一种基于离散余弦变换的数字语音篡改恢复算法  

A Tamper Recovery Scheme for Digital Speech Forensics Based on Discrete Cosine Transform

作　　者：赵岩松 钱清 熊晶晶 ZHAO Yansong;QIAN Qing;XIONG Jingjing(College of Foreign Languages,Xinyang Normal University,Xinyang 464000,China;School of Information,Guizhou University of Finance and Economics,Guiyang 550025,China;Medical Department,Xinyang Central Hospital,Xinyang 464000,China)

机构地区：[1]信阳师范学院外国语学院,河南信阳464000 [2]贵州财经大学信息学院,贵州贵阳550025 [3]信阳市中心医院医务科,河南信阳464000

出　　处：《信阳师范学院学报（自然科学版）》2022年第4期645-650,共6页Journal of Xinyang Normal University(Natural Science Edition)

基　　金：国家自然科学基金项目(61902085)。

摘　　要：利用离散余弦变换(Discrete Cosine Transform, DCT),提出了一种篡改恢复的语音水印算法。首先,分析了语音信号DCT系数的分布,选取部分DCT系数并编码,生成语音信号压缩数据。然后,将帧号和压缩数据一起作为水印信息,嵌入到语音信号DCT域中,得到含水印的信号。在语音被攻击后,由帧号定位被攻击帧,提取被攻击帧的压缩数据,以此来重构被攻击的内容进行篡改恢复。最后,通过实验证明了本文算法的有效性。A speech watermarking algorithm for tampering recovery based on Discrete Cosine Transform(DCT) is proposed. First, the distribution of DCT coefficients of the speech signal is analyzed, and some DCT coefficients are selected and encoded to generate compressed data of the speech signal. Then, the frame number and compressed data are used as the watermark and embedded in the DCT domain to obtain a watermarked signal. When the speech is attacked, the attacked frame is detected by the frame number. And the compressed data of the attacked frame is extracted to reconstruct the attacked content for tampering recovery. Finally, the experiments are conducted to verify the effectiveness of the algorithm.

关 键 词：数字语音 数字水印 篡改定位 篡改恢复 

分 类 号：TP309.7[自动化与计算机技术—计算机系统结构] TN912.3[自动化与计算机技术—计算机科学与技术]