基于随机位置选择和矩阵编码的语音信息隐藏方法  

Speech Information Hiding Method Based on Random Position Selection and Matrix Coding

作　　者：吴志军 李常亮 李荣 WU Zhijun;LI Changliang;LI Rong(College of Information Engineering and Automation,Civil Aviation University of China,Tianjin 300300,China)

机构地区：[1]中国民航大学电子信息与自动化学院

出　　处：《电子与信息学报》2020年第2期355-363,共9页Journal of Electronics & Information Technology

基　　金：国家自然基金委员会与中国民航局联合基金(U1933108);天津市自然科学基金(17JCZDJC30900);天津市教委科研计划项目(2019KJ117);2018年中央高校基本科研业务费项目(3122018D007,3122018C003)~~

摘　　要：针对低速率语音编码问题,该文提出基于G.723.1编码标准的信息隐藏算法。在基音预测编码过程中,通过控制闭环基音周期(自适应码本)的搜索范围,该文结合随机位置选择方法(RPS)和矩阵编码方法(MCM),实现秘密信息的嵌入,在语音编码过程中实现了信息的隐藏。RPS方法的采用降低了载体码字之间的关联性,MCM方法的采用降低了载体的改变率。实验结果证明,该文算法下PESQ恶化率平均值最大为1.63%,隐蔽性良好。For the low-rate speech encoding problem, an information hidden algorithm based on the G.723.1 coding standard is proposed. In the pitch prediction coding process, by controlling the search range of the closed-loop pitch period(adaptive codebook), combined with the Random Position Selection(RPS) method and the Matrix Coding Method(MCM), the secret information is embedded, which is implemented in the speech coding process. The adoption of the RPS method reduces the correlation between the carrier code-words, and the adoption of the MCM method reduces the rate of change of the carrier. The experimental results show that the average PESQ(Perceptual Evaluation of Speech Quality) deterioration rate under the algorithm is 1.63%,and the concealment is good.

关 键 词：低速率语音编码 G.723.1编码标准 基音预测 闭环基音周期 

分 类 号：TN912.3[电子电信—通信与信息系统]