MEPG-4AAC中信息隐藏的研究

Practical data-hiding in MEPG-4 AAC audio

为了方便存储和传输,基于心理模型的音频压缩格式得到了广泛的应用.音频信息隐藏技术能够在不降低音质的情况下在音频文件或音频流中传送与音乐相关的内容如歌词、作曲、歌唱家信息或者版权信息等.提出了一种在低码率AAC音频流中隐藏信息的算法,该算法基于人的听觉心理模型的基础上,在量化过程中进行信息的嵌入,并在MPEG-2/4 AAC编码器上进行了实验,结果证明该算法具有较好的鲁棒性,安全性高,并且隐藏容量可以灵活调整.

Perceptual audio coding has become a customary technology for storage and transmission of audio signals. This paper describes a new concept for simultaneous low bitrate encoding and information hiding for audio signals. Based on the perceptual model, the information hiding is implemented in the quantization process of the audio content which is favorable for robustness, signal quality and security. Experimental results obtained from implementation of an extended MPEG （ moving picture experts group） - 2/4 AAC （advanced audio coding） encoder verify the pacticability of the scheme.