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

摘要： 提出一种新的基于量化DCT域的音频水印算法，根据DC分量和AC分量在水印的鲁棒性和不可听性中起着不同的影响来设计水印算法，使水印的鲁棒性和不可听性得到更好的权衡。首先，把音频数据分成含有8个数据的不重叠块，然后，对每个数据块进行DCT变换；通过对DCT系数中DC分量和第四AC分量进行轮流调制来完成水印嵌入，每个数据块嵌入1 bit信息。实验表明该水印算法对于叠加噪声，有损压缩，重量化等常见的数字信号处理具有较好的鲁棒性，同时，水印系统具有很好的不可听性。

关键词: 音频水印, 量化, 离散余弦变换, 鲁棒性