可用于HDTV解码器的基于ROM查找表的IDCT电路大规模集成电路实现  

LSI Implementation of ROM Look-up Table Based Inverse Discrete Cosine Transform for HDTV Decoder

作　　者：杨宇红[1] 张文军[1] 胡力[1] 

机构地区：[1]上海交通大学图像通信与信息处理研究所,上海200030

出　　处：《上海交通大学学报》2006年第1期24-27,共4页Journal of Shanghai Jiaotong University

摘　　要：介绍了采用基于ROM查找表的全数字反离散余弦变换(IDCT)电路的算法原理及其并行架构的大规模集成电路实现.首先将二维IDCT转换为两个一维IDCT变换,根据蝶形算法进一步转换为矩阵的乘加运算.通过将连续输入的一个块的奇列或偶列的4个数据进行数据位重排,即将4个数据中相同的位组合在一起,则可用一个ROM查找表实现不同位的乘加运算.避免了硬件上的乘法器开销,具有很高的实现效率并节省硬件资源面积,因此可用于HDTV的实时解码器中,有助于降低电路的功耗.该电路已用于已开发的MPEG-2 MP@HL高清解码芯片,采用0.18μmCMOS工艺成功进行了流片.This paper presented an ROM look up table （LUT） based inverse discrete cosine transform （IDCT） algorithm and its LSI implementation having parallel architecture. First, the 2-D IDCT is transformed into two cascaded 1-D IDCT. Then 1-D IDCT can be implemented by multiplication and addition of matrix according to butterfly computation. By integrating the bits of the same position of four continuous input data in even or odd columns of a block, the calculation of multiplication and addition of different bits of the four data can be implemented with the same ROM LUT. The circuit can be effectively implementated with reduced area and low power for real time HDTV decoder. The IDCT circuit was successfully used in the MPEG-2 MP@HL decoder chip with SMIC 0.18 μm CMOS technology.

关 键 词：反离散余弦变换 ROM查找袁 HDTV解码器 大规模集成电路 

分 类 号：TN919.81[电子电信—通信与信息系统]