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Fast Complex Quadrature Mirror Filterbanks for MPEG-4 HE-AAC

Spectral Band Replication (SBR) has been introduced in MPEG-4 HE-AAC as bandwidth extension tool. All the framework of SBR is on complex-value domain to avoid the aliasing effect, and hence results in considerable time complexity. This paper focuses on the complex Quadrature Mirror Filter (QMF) banks used in HE-AAC encoder and decoder, and proposes the two fast decomposition methods for the time-consuming matrix operations in the filterbanks, that are based on DCT and DFT respectively. Hence, the time complexity can be effectively reduced by the fast algorithms for DCT and FFT.

Authors: Hsu, Han-Wen; Lee, Wen-Chieh; Liu, Chi-Min
Affiliation: National Chiao Tung University
AES Convention:121 (October 2006) Paper Number:6871 Import into BibTeX
Subject:Audio Coding

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