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A practical approach for the design of nonuniform lapped transforms

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2 Author(s)
Byung-Jun Yoon ; Dept. of Electr. Eng., California Inst. of Technol., Pasadena, CA ; Malvar, H.S.

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

Published in:

Signal Processing Letters, IEEE  (Volume:13 ,  Issue: 8 )

Date of Publication:

Aug. 2006

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