Fast Filterbanks for the Low PowerMPEG High Efficiency Advanced AudioCoding Decoder

摘要

The paper derives fast decomposition for the Quadrature Mirror Filter (QMF) banks of the Low power SpectralBand Replication (SBR) tools in the MPEG High Efficiency Advanced Audio Coding (HE AAC) decoder. Theoriginal computation-intensive matrixing operations in the filterbanks are decomposed into fundamental DiscreteCosine Transform (DCT) types and simple permutations. Hence, the computational complexity can be effectivelyreduced by using fast algorithms for DCT.