A practical approach for the design of nonuniform lapped transforms
Byung-Jun Yoon; Malvar, H.S.
Signal Processing Letters, IEEE
Volume 13, Issue 8, Aug. 2006 Page(s):469 - 472
Digital Object Identifier   10.1109/LSP.2006.873145
Summary:We propose a simple method for the design of lapped transforms with nonuniform frequency resolution and good time localization. The method is a generalization of an approach previously proposed by Princen, where the nonuniform filter bank is obtained by joining uniform cosine-modulated filter banks (CMFBs) using a transition filter. We use several transition filters to obtain a near perfect-reconstruction (PR) nonuniform lapped transform with significantly reduced overall distortion. The main advantage of the proposed method is in reducing the length of the transition filters, which leads to a reduction in processing delay that can be useful for applications such as real-time audio coding

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