基于小波和复倒谱变换的音频水印技术

提出了一种基于小波分解和复倒谱的音频数字水印算法。该算法通过对原始语音信号进行三级小波分解，提取出小波近似分量，从近似分量中选取重要系数。利用复倒谱变换系数的不相关性，对重要系数进行复倒谱变换实现解相关运算，最终把水印嵌入到语音复倒谱域中，实现了在语音信号中嵌入二值图像，提高了水印嵌入算法的不可听性。实验证明该方法在抗常见的信号处理如加噪、滤波、重采样、有损压缩等方面具有较好的稳健性。

An Audio Digital Watermarking Algorithm Based on Wavelet Transform and Cepstrum Transform

This paper proposed an audio digital watermarking algorithm based on wavelet and cepstrum transform. This algorithm decomposed original audio in three level wavlete,extracted the wavelet approximate components and selected important coefficients from them.Then tansformed the important coefficients in cepstrum domain so that decomposed the correlation of them using the irrelevance of the cepstrum coefficients.At last the watermarks were embedded in the cepstrum domain.Realizing to embed a binary image watermark into the audio signal and improved the imperceptibility of watermarks. Experimental results show that this algorithm has better robustness on resisting common signal processing such as adding noise, filtering, resampling and lossy compression.