Adaptive digital audio watermarking method based on DCT and lifting wavelet transform

Abstract

In order to protect copyright,an adaptive digital audio watermarking method based on Discrete Cosine Transform(DCT) and lifting wavelet transform was proposed,which was based on computing power of lifting wavelet and the largest auditory tolerance of DC coefficients after DCT transform.Firstly,the original audio signal was decomposed into low-frequency and high frequency component after lifting wavelet transform,then DCT was performed on the low-frequency component and watermarks were embedded into the DC coefficient sequences according to the largest DC auditory tolerance after DCT coefficients transform.Meanwhile,considering the balance between the robustness and the imperceptibility of the audio watermarking,the adaptive adjustments were used for embedded watermarking.The experimental results show that the proposed method not only has low computational complexity,but also is robust to malicious replace operation and common signal attacks like noise adding and low-pass filtering.