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在Clenshaw’s递归算法基础上,采用奇偶双路并行和蝶型单元技术,提出一种高效的MDCT/IMDCT递归结构,将N点MDCT/IMDCT的计算周期降低到N2/16+2.这个递归结构具有通用性,适用于MDCT和IMDCT的计算,可提高电路结构的有效利用率.同时,其在Xilinx Virtex-ⅡPro FPGA开发板上实现了256点MDCT递归电路.实验结果表明,该递归结构在运算速度、数据吞吐率和硬件利用率方面均取得较大的改进.另外,该MDCT/IMDCT电路结构可以应用在国际音频编码标准MPEG-1,MPEG-2,MPEG-4以及数字音频压缩系统Dolby AC3中.
Based on the Clenshaw’s recursive algorithm, an efficient MDCT / IMDCT recursive structure is proposed based on parity dual parallelism and butterfly cell technology, which reduces the computation period of N-point MDCT / IMDCT to N2 / 16 + 2. This recursive structure has It is suitable for MDCT and IMDCT calculation, which can improve the effective utilization of circuit structure.At the same time, it realizes 256-point MDCT recursive circuit in Xilinx Virtex-ⅡPro FPGA development board.Experimental results show that the recursive structure has advantages in operation speed , Data throughput and hardware utilization have made significant improvements.In addition, the MDCT / IMDCT circuit structure can be applied to the international audio coding standard MPEG-1, MPEG-2, MPEG-4 and digital audio compression system Dolby AC3 .