EAC音频编码技术

利用一种余弦调制多分辨率分析技术提供的高性能频率选择能力，设计了一套完整的音频编解码器。与其它先进的音频编码技术（如MPEG AAC、MP3和AC－3等）相比，该编码技术的多分辨率滤波技术、信号类型判断技术、心理学计算技术和量化技术有其鲜明的特点和优势。实验表明，在没有实现完全自适应的情况下，其单声道编码效率高于优化的AAC编码器核心编码单元的编码效率。

EAC audio encoding technique

First, a kind of filter bank technique of multi-resolution analysis based on cosine modulation is introduced. Then, using the excellent ability of the above filter bank technique to selecting frequency band, a set of audio codec is designed. Compared to other advanced audio codecs (such as MPEG AAC,MP3 and AC-3,etc.),the codec provided here has obvious advantages in aspects of multi-resolution filter bank analysis, signal type judgement, psychoacoustic analysis and quantization. Experiments show that, under the condition of not completely realizing self-adaptivity, the single channel coding efficiency of our codec is already superior to that of the core coding unit of the open code of the AAC codec which has already been elementally optimized.