New Recursive Algorithms for the Unified Forward and Inverse MDCT/MDST

Authors:
Vladimir Nikolajevic;Gerhard Fettweis
Affiliations:
Sony International (Europe) GmbH, Advanced Technology Center Stuttgart, Telecommunication R&D Europe, Heinrich-Hertz-Strasse 1, D-70327 Stuttgart, Germany;Chair for Mobile Communications Systems, Department of Electrical Engineering, Dresden University of Technology, Helmholtzstr. 18 Barkhausen Bau E63, 01062 Dresden, Germany
Venue:
Journal of VLSI Signal Processing Systems
Year:
2003

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Abstract

Forward and inverse MDCT are two of the most computationally intensive operations in the MPEG audio coding standard. In this paper we derive sinusoidal recursive formulas for transforming kernels of the MDCT/MDST and IMDCT/IMDST. Then we efficiently implement MDCT/MDST and IMDCT/IMDST of the general length using the regressive structure derived from the sinusoidal recursive formulas. The proposed regular structure is particularly suitable for parallel VLSI realization. Our solution requires significantly less operations as well as less hardware compared with a recently proposed one.