【摘要】 文章主要讨论如何使用 DSP Builder来实现 MP3音频解码中的 IMDCT。MDCT和 IMDCT是 2种重叠正交变换 ,也是 MPEG音频标准中运算量最大的 2种运算 ,主要应用在数字信号处理当中。采用正弦递归循环公式 ,实现 IMDCT的内核 ,得到一种该变换的高效实现方法 ,这种方法特别适合 VLSI的并行实现更多还原

【Abstract】 This paper mainly deals with the implementation of the recursive algorithms of the inverse modified discrete cosine transform(IMDCT) in MP3 by DSP Builder. Modified discrete cosine transform(MDCT) and IMDCT,which are lapped orthogonal transform used in signal processing,are two of the most intensive computational operation in the MPEG audio coding standard. In the paper,IMDCT of the general length is efficiently implemented using the regressive structure derived from the sinusoidal recursive formulas. The proposed regular structures are particularly suitable for parallel very-large-scale-integration(VLSI) realization.更多还原