Audio watermarking for copyright protection based on psychoacoustic model and adaptive wavelet packet decomposition

Abstract

A novel audio watermarking scheme for copyright protection is proposed. By modifying the relationship between adjacent coefficients, the watermark message is embedded in the wavelet packet domain. The embedding procedure is controlled by a psychoacoustic model to guarantee inaudibility. The new method combines the psychoacoustic model with wavelet packets to choose the best basis of wavelet packet decomposition such that the decomposed subbands are closer to critical bands. Therefore, the masking threshold in the new approach is larger than those proposed previously. In this way, the proposed scheme enlarges the range for the watermark to resist attacks and it becomes more robust. Experimental results show that the proposed scheme can effectively resist a variety of signal manipulations and attacks, including MPEG compression, low-pass filtering, resampling, adding white or random noise, etc.