AbS-LPC低速率压缩语音信息隐藏技术综述

An Overview of Steganography for AbS-LPC Low-bit-rate Compressed Speech

合成分析线性预测编码(AbS-LPC)是目前最常用的语音编码方案,广泛应用于多种低速率语音编码器中。基于AbS-LPC的信息隐藏技术成为了语音信息隐藏中新的研究热点,秘密信息的嵌入主要面向三个域:音调合成滤波、LPC合成滤波器、压缩语音码流中的码元。本文分别对这三个嵌入域的信息隐藏方法进行综述,归纳总结现有方法的特点,并指出该领域的研究方向。

Analysis by Synthesis-Linear Predictive Coding(AbS-LPC)is the most popular speech coding scheme and widely used in many low-bit-rate speech codecs.Steganography based on AbS-LPC has become one new research focus in the field of speech steganography.There are mainly three embedding domains for secret information,including pitch synthesis filter,LPC synthesis filter,and code elements in compressed speech stream.In this paper,we systematically described the steganography methods of the three embedding domains and summarized their characteristics.After that,the research directions in this field were pointed out.