一种基于CORDIC算法改进的高速低功耗DCT协处理器设计

A High-Speed Low-Power Modified CORDIC DCT Coprocessor

介绍了一种支持MPEG2压缩协议,应用于ARM9内核、高速低功耗的二维DCT协处理设计研究.该协处理器利用行列分解法,并行优化实现二维DCT数据结构,明显提高了8×8数据块的处理速度.与此同时,应用改进的CORDIC算法——移位代替乘法并优化移位算法实现一维DCT.仿真结果表明,对于此种一维DCT算法硬件实现,在符合MPEG2精度和ARM9数据传输频率的前提下比文献[2]速度提高了30%,面积却减少了50%.这种协处理器可以在移动多媒体设备的编解码模块中得到广泛应用.

A supported MPEG2 protocol,applied to ARM9 core,high-speed and low-power two-dimensional DCT coprocessor is introduced.With the optimization of the structure of two-dimensional DCT co-processor,the speed of processing 8×8 block is largely improved.At the same time,A modified one-dimensional DCT CORDIC algorithm is applied,using a special shifter in place of traditional multiplier.The simulation result showed that,Based on the precision and the transition frequency requirement,for this one-dimensional DCT implemented by hardware,the speed is 30% faster than paper[2] while the area has decreased by 50%.This Coprocessor can be largely used in the Code/Decode module of multimedia products.