A Novel Synchronization Invariant Audio Watermarking Scheme Based on DWT and DCT

Synchronization attack is one of the key issues of digital audio watermarking. In this correspondence, a blind digital audio watermarking scheme against synchronization attack using adaptive quantization is proposed. The features of the proposed scheme are as follows: 1) a kind of more steady synchronization code and a new embedded strategy are adopted to resist the synchronization attack more effectively; 2) he multiresolution characteristics of discrete wavelet transform (DWT) and the energy-compression characteristics of discrete cosine transform (DCT) are combined to improve the transparency of digital watermark; 3) the watermark is embedded into the low frequency components by adaptive quantization according to human auditory masking; and 4) the scheme can extract the watermark without the help of the original digital audio signal. Experiment results shows that the proposed watermarking scheme is inaudible and robust against various signal processing such as noise adding, resampling, requantization, random cropping, and MPEG-1 Layer III (MP3) compression