一种基于回声隐藏的数字音频水印改进算法  

Digital Audio Watermarking Adaptive Algorithm Based on Echo Hiding

作　　者：雷鸣[1] 王新房[1] 刘侨[1] 孙鑫[1] 

机构地区：[1]西安理工大学自动化与信息工程学院,西安710048

出　　处：《计算机系统应用》2013年第7期81-84,94,共5页Computer Systems & Applications

摘　　要：在前后向双核回声隐藏思想的基础上,提出了一种基于回声隐藏的改进算法.根据设定的水印的嵌入率来确定音频段的能量阈值,选择短时能量高于此阈值的音频段嵌入水印信息,并且引入功率倒谱检测法来检测水印信息.仿真结果表明改进后的算法具有不可感知性更高,隐藏效果好并且显著降低了水印信息检测的误码率.Based on the method of dual backward and forward delay kernels, an improved algorithm of echo hiding in which watermark codes embedded the audio signal is proposed in this paper. The energy of each segment into which the original audio is first divided was computed. The energy threshold of audio segments is set by the given rate of embedding watermark codes. Then the audio segments whose energy value above the energy threshold are embedded with the watermark codes and the secret information is detected with a power cepstrum computing method. The simulation results show that the improved algorithm has a significant improvement in imperceptibility and can remarkably decrease the bit error rate of detected watermark codes.

关 键 词：回声隐藏 短时能量 能量阈值 功率倒谱 

分 类 号：TP309.7[自动化与计算机技术—计算机系统结构]