基于复倒谱系数均值比较的数字音频水印算法

An Audio Watermarking Algorithm Based on Complex Cepstrum Coefficient Mean Comparison

提出一种基于复倒谱系数均值比较的数字音频健壮、透明及盲水印算法。该算法把音频信号划分为若干帧,每帧划分为若干个节,每节包含若干个相同的采样点,对每帧的前二节实施复倒谱变换,然后比较前二节复倒谱系数的均值,结合水印序列为“0”或“1”,采取缩小、增加或不改变复倒谱系数均值的方法,在复倒谱系数中嵌入水印。实验证明,该算法具有较强的健壮性,较好的透明性,提取水印属盲水印提取,能经受重新量化、重采样、添加噪声、低通滤波、音频格式转换等常见信号处理及攻击。与SMM算法比较,其透明性、健壮性更好。

This paper proposed a robust, transparent and blind digital audio watermarking algorithm base on complex cepstrum coefficient mean comparison. The audio signal has been divided into several frames, and the frame has been divided into several sections including the same samples. The first two sections of each frame has been transformed by complex cepstrum, means of complex cepstrum coefficient of the first two sections has been compared, according to means comparison and combining watermark bit, adopting the way of not changing, increasing or reducing coefficient of the complex cepstrum, watermarks has been embedded into the complex cepstrum coefficient. The result demonstrates that the algorithm is robust, transparent and blind against common signal processing manipulations and attacks, such as re-sample, remodulation, noise, low-pass filter and conversion etc. Compared with the SMM algorithm, it has better transparency and robustness.