基于 AMR-WB 线谱频率参数的隐写算法

摘要

AMR-WB（Adaptive Multi-Rate-Wideband）的线谱频率 LSF（Line Spectrum Frequency）参数在编码过程中会分裂为若干子矢量。利用编解码过程中的 ISF 索引参数，提出一种在3G 话音中隐藏信息的算法。该算法首先选择用于信息隐藏的 LSF 索引段，然后通过修改所选的 LSF 索引段进行信息隐藏。实验结果表明，改变特定 LSF 索引会在较少影响话音质量的同时隐藏信息，该算法在具有较好隐蔽性的同时又能较少影响语音质量。%In encoding process,the parameters of line spectrum frequency (LSF)of AMR-WB (Adaptive Multi-Rate-Wideband)will be split into several sub-vectors called LSF indexes.This paper proposes an algorithm of hiding information in 3G speech by using the LSF index parameters in encoding/decoding process.The algorithm chooses the LSF index sections for information hiding first,and then hides the information by making modifications on these selected index sections.Experimental results show that to modify certain LSF indexes can lead to information hiding with little degradation of speech quality.Therefore this information hiding algorithm has good concealment quality while degrades little in voice quality as well.