关键词: 音频水印, 量化, 离散余弦变换, 鲁棒性

Abstract: A novel algorithm for audio watermarking based on quantizing DCT domain is proposed，the authors design watermarking algorithm according to DC and AC DCT coefficients play different influence in robustness and inaudibility to tradeoff robustness and inaudibility better.Firstly，the authors decompose the audio into no overlapping blocks every block contain eight data，then，every block is performed the DCT transform.Watermark is embedded by modulating DC DCT coefficient or 4th AC DCT coefficient by turns，every block is embedded one bit message.Experimental results show the algorithm is robust to common operations on digital audio signal，such as add noise，lossy compression，re-quantify etc，and inaudibility is satisfaction.

Key words: audio watermarking, quantization, DCT transform, robustness