Digital audio watermark algorithm based on modified-DWT

Making use of two-dimension binary image as watermarking information, the audio data as embedded target, a blind audio digital watermarking algorithm based on wavelet transform is presented. First, the watermarking image has been processed by pseudorandom permutation, and then converted it into a one-dimension sequence; second, the audio data has been divided and discrete wavelet transform, the watermarking is embedded into the high-frequency sub-band by modifying the parity of the original audio signal wavelet coefficients. The watermark can be extracted without the original audio signal. Experiments show that the algorithm is simple and practical and the watermarking is imperceptible and robust against some common signal processing operations.