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Linear Filtering in MDCT domain

Sreenivas, TV and Kumaraswamy, Suresh (2008) Linear Filtering in MDCT domain. In: Audio Engg. Soc. 124th Convention, Amsterdam.

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Official URL: http://www.aes.org/e-lib/browse.cfm?elib=14470

Abstract

In this paper, expressions for convolution multiplication properties of MDCT are derived starting from the equivalent DFT representations. Using these expressions, methods for implementing linear filtering through block convolution in the MDCT domain are presented. The implementation is exact for symmetric filters and approximate for non-symmetric filters in the case of rectangular window based MDCT. For a general MDCT window function, the filtering is done on the windowed segments and hence the convolution is approximate for symmetric as well as non-symmetric filters. This approximation error is shown to be perceptually insignificant for symmetric impulse response filters. Moreover, the inherent $50 \%$ overlap between adjacent frames used in MDCT computation does reduce this approximation error similar to smoothing of other block processing errors. The presented techniques are useful for compressed domain processing of audio signals.

Item Type: Conference Paper
Additional Information: Copyright of this article belongs to Audio Engineering Society. Inc.
Department/Centre: Division of Electrical Sciences > Electrical Communication Engineering
Date Deposited: 20 Sep 2011 06:40
Last Modified: 20 Sep 2011 06:40
URI: http://eprints.iisc.ernet.in/id/eprint/40610

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