Fast decomposition of filterbanks for the state-of-the-art audio coding

Shih Way Huang, Tsung Han Tsai, Liang Gee Chen

Research output: Contribution to journalArticlepeer-review

8 Scopus citations


This letter derives fast decomposition for the quadrature mirror filterbanks (QMFs) of the low power spectral band replication (SBR) tools in the MPEG high efficiency advanced audio coding (HE AAC) decoder. In contrast with the standard method where computation-intensive matrix operations are employed in the QMF, the proposed method decomposes the matrix operations into conventional discrete cosine transform of type II and III (DCT-II and DCT-III) and simple permutations for easy implementation. The computational complexity can be also reduced effectively by using fast algorithms for DCT.

Original languageEnglish
Pages (from-to)693-696
Number of pages4
JournalIEEE Signal Processing Letters
Issue number10
StatePublished - Oct 2005


  • Audio coding
  • Fast algorithm


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