In current audio coding standards such as MPEG-1 Layers 1-3, MPEG-II Layers 1-4, MPEG-IV, and AC-3, various forms of the cosine modulated filter bank (CMFBs) have been adopted for compression. This paper proves that all these MCTs can be derived into two modules: the permutation and the discrete cosine transform. The derived DCTs are either type II, type-III, or type IV. On the three types of the DCT, this paper proposes a fast computing algorithm to uniformly compute all the three types of the DCTs. The new fast algorithm will be demonstrated to have good features in regularity, complexity, and general applicability.

Authors: Liu, Chi-Min; Lee, Wen-Chieh
Affiliation: National Chiao Tung University, Taiwan
AES Convention: 104 (May 1998) Paper Number: 4729
Publication Date: May 1, 1998
Subject: Perceptual Coding

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