Improved implementation of MDCT in MP3 audio coding

Forward and inverse modified discrete cosine transform (MDCT) are two of the most computational intensive operations in the MPEG audio coding standard. So, their efficient implementations are very important. We present an improved algorithm for fast implementation of forward and inverse MDCT for layer III in MPEG-1 and MPEG-2 audio coding standards. The proposed algorithm requires fewer operations than recently proposed one. Furthermore, it needs one step less in signal flow graph and it employs smaller shuffle block compared to recently proposed algorithm.