抗PCM A/μ律压缩及其转换的语音密写  

Steganography in Speech Immune to PCM A/μ Law Compression and Mutual Conversion

作　　者：胡礼才[1] 王朔中[1] 

机构地区：[1]上海大学通信与信息工程学院,上海200072

出　　处：《电子与信息学报》2007年第9期2226-2229,共4页Journal of Electronics & Information Technology

基　　金：国家自然科学基金(60372090)资助课题

摘　　要：该文提出一种在数字语音信号中嵌入隐蔽信息的方法。根据PCM A/μ律压缩及其转换特性,采用对某些宿主语音样本预修改和动态选择嵌入比特位的方法,使密写信号不仅没有感知失真,而且经A/μ律压缩及其相互转换处理后仍可无误提取嵌入的隐蔽数据,因此含密语音信号不仅可在Internet上传输,还可在跨国PSTN中传输。实验结果表明了该方法的有效性。A steganographic method is proposed for embedding secret information in digital speech signals. Depending on the PCM A/μ law compression/decompression characteristics and mutual conversion between the two laws, appropriate bit planes are chosen in modifying the host speech samples to embed secret data. The induced distortion is highly imperceptible, and the embedded information is robust against A/μ law compression and mutual conversion, therefore suitable for transmission not only through the Internet but also through international PSTN. Experimental results indicate the effectiveness of the proposed method.

关 键 词：密写 A/μ律 量化间隔 A/μ律转换 

分 类 号：TP309[自动化与计算机技术—计算机系统结构]