基于心理声学模型和临界频带子波变换的数字声频水印  

Audio watermarking based on psychoacoustic model and critical band wavelet transform

作　　者：陶智[1] 赵鹤鸣[2] 顾济华[1] 吴迪[2] 

机构地区：[1]苏州大学物理科学与技术学院,苏州215006 [2]苏州大学电子信息学院,苏州215006

出　　处：《声学学报》2006年第2期114-119,共6页Acta Acustica

基　　金：国家自然科学基金(60572076)江苏省高校自然科学研究计划(05JKB510113)资助项目

摘　　要：提出了一种基于临界频带子波变换的声频数字水印算法。首先根据心理声学模型,计算载体声频信号的掩蔽阈值,利用人耳听觉的临界频率与临界频带子波变换域的相似性,将掩蔽门限映射到临界频带子波域,然后将水印信号嵌入到中低频子波系数中,嵌入强度由掩蔽阂值自适应控制。实验结果表明:该算法隐藏水印具有很强的掩蔽性,对原始语音的影响基本上察觉不出来;叠加了水印的声频信号对数据压缩、加噪、重采样、低通滤波等常用声频信号处理技术具有很好的鲁棒性。Watermark embedding algorithm based on critical band wavelet transform of digital audio signal is proposed in this paper. The masking threshold for each audio signal segment was calculated on the basic of psychoacoastic model. According to the similarity between critical band of human auditory system and critical band wavelt transform, a watermark was embedded into the low-band and mid-band coefficients of digital wavelet. The embedding strength was adaptively controlled by the masking threshold. The experiment results show that the embedded watermark signal is inaudible, and the watermarked audio signal has good robustness against many attacks such as compression, noise, re-sampling, low-pass filtering.

关 键 词：数字水印算法 心理声学模型 临界频带 数字声频 子波变换 掩蔽阈值 声频信号 信号处理技术 临界频率 掩蔽门限 

分 类 号：TP309[自动化与计算机技术—计算机系统结构]