MP3编解码器中MDCT与IMDCT的硬件实现  

Hardware Implementation of MDCT and IMDCT in MP3 Codec

作　　者：刘凡[1] 向洵[2] 

机构地区：[1]中国电子科技集团公司第二十四研究所,重庆400060 [2]重庆科技学院数理系,重庆401331

出　　处：《微电子学》2009年第2期199-202,207,共5页Microelectronics

摘　　要：在MP3编解码器的设计中,前向MDCT与反向IMDCT是两个计算最为复杂的部分。提出了一种新的算法,对MDCT与IMDCT的实现进行优化,极大地降低了运算量。该算法将MDCT与IMDCT的计算分成三步实现:前处理,核心处理,后处理。其中,核心处理部分由MDCT与IMDCT共用,大大减少了对硬件电路的需求,降低了芯片成本。MDCT and IMDCT are the most complicated units in the circuit design of MP3 codec. A novel algorithm was proposed to optimize the implementation of MDCT and IMDCT and reduce computational complexity. In this algorithm, the computation of MDCT and IMDCT was implemented in three steps： pre-process,kernel process and post-process,and the kernel process were shared by MDCT and IMDCT, which greatly reduced the chip area, thus cutting down its cost.

关 键 词：MP3播放器 编解码器 MDCT IMDCT 

分 类 号：TN912[电子电信—通信与信息系统] TN76[电子电信—信息与通信工程]