MPEG专用IDCT处理器的优化设计

An Optimized VLSI Implementation of IDCT for MPEG

二维离散余弦逆变换 ( Inverse Discrete Cosine Transform,IDCT)是运动图象专家组( Moving Picture Expert Group,MPEG)视频解码器的重要模块之一 .提出了一种优化的二维IDCT超大规模集成电路 ( Very Large Scale Integrated Circuit,VLSI)实现结构 .利用 IDCT的矩阵乘法中固定系数的内在特点 ,采用公用表达式的方法 ,降低 IDCT实现规模 ,提高了电路的速度 .采用了 0 .6μm CMOS电路工艺 ,芯片面积约为 3.5mm× 3.5mm,速度可达 1 0 0

Inverse discrete cosine transform (IDCT) is an important module in MPEG decoder. In this paper,an optimized VLSI implementation for IDCT is presented.According to the optimizing method,the property of the constants in the array multiply for IDCT is utilized.By using the common expressions,the implementation complexity of IDCT is reduced greatly. The 0 6μm\|CMOS technology is applied to the IDCT,with the chip size about 3 5mm×3 5mm and the frequency 100MHz.