作为新一代最有效的高保真数字音频编码手段，MPEG AAC具有压缩比高，重建音频质量好，编解码过程模块化，声道配置灵活等特点，并且不同的层次具有不同的算法复杂度。-As a new generation of the most effective means of high-fidelity digital audio coding, MPEG AAC with high compression, the reconstruction of good quality audio, codecs, the process of modular, flexible channel configuration, and different algorithms have different levels of complexity.