Content-based audio watermarking method to resist de-synchronization attacks

According to the low-level steady statistics of audio signal and uncorrelated property of Stationary wavelet transform (SWT), a blind adaptively quantized audio watermarking algorithm based on NCG (Normed Centre of Gravity, NCG) is proposed in this paper to resist de-synchronization attacks. Firstly, the audio signal is framed by equalized length. Secondly, the coordinates of NCGS are detected from the framed audio, Finally, the copyright information is embedded into the low frequent coefficients of SWT domain region which includes the NCGS. Experimental results show that the scheme is robust against common signal processing attacks and malicious tampering attacks. More importantly, meanwhile security of the algorithm is guaranteed by using secret keys.