一种基于回声隐藏的倒谱提取优化算法  

Developed cepstrum method for data extraction based on echo hiding

作　　者：段柳云[1] 宗节保[1] 王莹[1] 成鸿飞[1] 尹忠[1] 

机构地区：[1]武汉大学电子信息学院,湖北武汉430079

出　　处：《电子设计工程》2010年第7期77-79,共3页Electronic Design Engineering

基　　金：国家大学生创新性实验计划(091048640)

摘　　要：在回声隐藏算法的基础上,提出一种倒谱提取优化算法。新算法改进了传统倒谱对回声位置的判断标准,提高了数据提取正确率。通过引入原始语音数据的倒谱值作为参照量,重新定义回声位置的判断标准,弥补了传统倒谱算法的缺陷。MATLAB仿真结果证明:即便在回声衰减系数较小的情况下,算法依然能明显地提高数据提取的正确率,且稳定性良好。A developed cepstrum method of data estraction based on echo hiding is proposed in this paper for data embedded within audio signal. A new criterion of echo location is defined and this new algorithm can greatly improve the accuracy of data extraction. What＇s greatly different from the traditional cepstrum is that the cepstral value of the oroginal signal is introduced in as a reference to help define the new criterion. The the accuracy of data extraction is improved by using the new cepstral criterion which makes the advantage of the developed algotithm clear. Large numbers of simulation experiments in MATLAB show that the new algotithm can obviously improve the accuracy even though the echo attenuation coefficient is small. What＇s more,the new algorithm has a good stability.

关 键 词：回声隐藏 倒谱法 优化 位置判断标准 

分 类 号：TP309[自动化与计算机技术—计算机系统结构]