一种基于LDPC码的离散小波域语音隐藏算法  

A DWT Speech Hiding Algorithm Based on LDPC

作　　者：陈琦[1] 张连海[1] 

机构地区：[1]解放军信息工程大学信息工程学院,河南郑州450002

出　　处：《通信技术》2008年第11期123-125,共3页Communications Technology

摘　　要：研究了一种将保密语音隐藏在公开的音频载体中的信息隐藏算法。首先对保密语音进行改进型多带激励(IMBE)编码,并进行LDPC编码后形成秘密信息;然后对音频载体进行离散小波变换,通过修改相邻时频段的能量而嵌入秘密信息。提取时按同样的方法确定相邻时频段的能量值以盲恢复秘密信息,并经LDPC译码和IMBE解码还原保密语音。仿真实验表明该算法对音频压缩、加噪等攻击具有较高的鲁棒性。A novel information hiding algorithm for security speech communication is proposed in this p First, Improved Multi-Band Exited（IMBE） coding is used for security speech, and the bits are encoded by Then open audio is converted into segments and discrete wavelet transform（DWT） is performed. The sec information is embedded by modifying the sub segments energy of DWT. At the receiver, based on the same the sub-segments energy is determind and the hiding bit is recoverd without original audio. The secret me s aper. LDPC. urity thod, peech is recoverd by IMBE decoding. Simulation results show that the method is robust to some attacks such as low pass filter, adding noise and so on

关 键 词：LDPC码 离散小波变换 信息隐藏 语音保密 改进型多带激励编码 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]