Fast algorithm for computing the forward and inverse MDCT in MPEG audio coding

The modified discrete cosine transform (MDCT) is always employed in transform-coding schemes as the analysis/synthesis filter bank. In this paper, an efficient algorithm for MDCT and inverse MDCT (IMDCT) computation for MPEG-1 audio layer III and MPEG-2 international audio-coding standards is proposed, using only the type-II DCT. Finally, the proposed algorithm is compared to the similar algorithms in this paper.