关键词: 音频水印, 最不重要位, 量化, 倒谱

Abstract: In order to protect copyright, a novel cepstrum transform watermarking algorithm in wavelet domain was proposed. The proposed algorithm adopted the idea of Least Significant Bit (LSB) and quantization. Firstly, the audio signal was divided into several segments; the segment was transformed with wavelet domain and complex cepstrum. Then the LSB of mean of complex cepstrum coefficients was computed. Lastly, the watermark was embedded into the mean of complex cepstrum coefficients through changing its odd and even. When extracting, only the LSB of mean of complex cepstrum coefficients was judged to restore the watermark. The algorithm was blind. The embedding processing of the proposed algorithm does not depend on any threshold, and it is more conducive to the practical application of the algorithm. The experimental results show that the algorithm is very robust to re-sampling, re-quantization, low filter, amplitude attack, etc.

Key words: audio watermarking, Least Significant Bit (LSB), quantization, cepstrum