Research on Digital Audio Watermark Based on Complex Cepstrum Transform

This paper proposes a new algorithm of digital audio watermark based on the complex cepstrum transform.The audio signal is divided into several frames which include the same samples,the mean value of frames is calculated,the frames of mean value is greater than or equal 0 is transformed by complex cepstrum,and mean value of complex cepstrum coefficient of the frames and threshold value is compared,according to the result of comparison and combining watermark bit,adopting the way of not changing,increasing or reducing coefficient of the complex cepstrum.Watermark is embedded into the complex cepstrum coefficients.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.