Radix-3 Algorithm for the Fast Computation of Forward and Inverse MDCT

Shu, Huazhong
Bao, Xudong,
Toumoulin, Christine
Luo, Limin,

Open link

Publication date

February 2007

DOI

10.1109/LSP.2006.882108

Publisher

Institute of Electrical and Electronics Engineers (IEEE)

Abstract

International audienceThe modified discrete cosine transform (MDCT) and the inverse MDCT (IMDCT) are two of the most computationally intensive operations in layer III of MPEG audio coding standard. In this letter, we present a radix-3 algorithm for efficiently computing the MDCT and the corresponding IMDCT of a sequence with length N = 2. 3^m . Comparison of the computational complexity with some known algorithms shows that the proposed approach reduces significantly the number of arithmetic operations