基于量化的小波域数字音频水印算法

提出了一种基于量化的小波域数字音频水印算法，该算法首先将视觉可辨的二值水印图像降维成一维水印序列，再将水印序列伪随机排序并与m序列作扩频调制，最后对数字音频信号作分段离散小波变换，调制信号通过量化处理过程嵌入到离散小波变换后的系数中，提取水印信号无需使用原始数字音频信号，仿真实验表明水印是不可察觉的，经过mp3有损压缩，低通滤波，重采样等操作后仍具有很强的稳健性。

Digital audio watermarking algorithm based on quantization in wavelet domain

This paper presents a digital audio watermarking algorithm based on quantization in wavelet domain. The visually recognizable binary watermark image could be converted into the one dimensional sequence in the algorithm. The sequence is permuted pseudo randomly and is modulated by using m sequence. The digital audio signal is converted into segments and discrete wavelet transform is performed. The modulated signal is embedded in coefficients in wavelet domain by quantization process. The method can extract the watermark without the original digital audio signal. The experimental results show that the watermark is imperceptible and the algorithm is robust to many operations to digital audio signal, such as mp3 loss compression, low pass filter, resample and so on.