基于复倒谱变换的音频数字水印算法

Audio Digital Watermark Algorithm Based on Complex Cepstrum Transform

提出一种基于复倒谱变换的音频数字水印算法。将输入的数字音频信号划分为若干帧,对其中指定帧进行一维复倒谱变换,计算该帧的复倒谱系数均值并与设定阈值进行比较,根据二值水印序列不同取值,通过对复倒谱系数均值采取不同处理方式在复倒谱系数中嵌入水印图像。Matlab仿真结果表明,该算法具有较强鲁棒性,并且嵌入水印后音频没有产生明显的降质现象,透明性较好。

This paper proposes an audio digital watermark algorithm based on complex cepstrum transform.The input digital audio signal is divided into several frames,among which the specified frames are transformed into one dimensional complex cepstrum transform,and the mean value of the complexcepstrum coefficients of the frame is calculated and compared with the set threshold value.According to the different values of the binary watermark sequence,the watermark is embedded into the complex cepstrum coefficients by adopting different processing methods for the mean value of the complex cepstrum coefficients.The Matlab simulation results show that the algorithm is robust,and the audio has no obvious degradation after embedding watermark,and the transparency is better.