基于心理声学模型的自适应量化同步数字音频水印算法  

Adaptive quantization and synchronous digital audio watermarking algorithm based on psychoacoustic model

作　　者：王永琦[1] 杨洋[2] 邓琛[1] 

机构地区：[1]上海工程技术大学电子电气学院,上海201620 [2]上海工程技术大学高职学院,上海200437

出　　处：《电子技术应用》2009年第7期153-156,共4页Application of Electronic Technique

基　　金：上海高校选拔培养优秀青年教师科研专项基金(05XPYQ50)

摘　　要：针对传统的固定步长量化方法对不同种类音频载体适应性较差的缺点,基于心理声学模型,在获取的语音信号的DCT域的低频系数中量化地嵌入水印信息,量化步长由掩蔽阈值自适应控制,以满足水印的盲检测。同时引入了同步信号的思想,利用同步信号和水印序列号定位水印的嵌入位置。实验结果表明,该算法不仅具有较好的不可感知性,而且对诸如低通滤波、有损压缩、重采样和剪裁等攻击均具有较好的顽健性。The existing quantization audio watermarking algorithms have generally adopted the fixed quantizations strategy, which is unavailable for variety kinds of audio. Watermarking was embedded by quantizing DCT low-band coefficients of digital audio signal. The embedding strength was adaptively controlled by the masking threshold. The idea of embedded synchronic signal is proposed, which uses the synchronic signal for locating the watermark location. Experiment results show that the propsed watermarking scheme is inaudible and robust against various signal processing, such as lowpass filtering , noise adding, re-sampling and cutting.

关 键 词：数字音频水印 心理声学模型 自适应量化 同步信号 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]