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Cited by 398

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Lapped transforms for efficient transform/subband coding

Malvar, H.S.·1990·IEEE Transactions on Acoustics, Speech, and Signal Processing

Abstract

Two lapped transforms for subband/transform coding of signals are introduced: a version of the lapped orthogonal transform (LOT), which can be efficiently computed for any transform length; and the modulated lapped transform (MLT), which is based on a modulated quadrature mirror (QMF) bank. The MLT can also be efficiently computed by means of a type-IV discrete sine transform (DST-IV). The LOT and the MLT are both asymptotically optimal lapped transforms for coding an AR(1) signal with a high intersample correlation coefficient. The coding gains of the LOT and MLT of length M are higher than that of the discrete cosine transform (DCT) of the same length; they are actually close to the coding gains obtained with a DCT of length 2M. An MLT-based adaptive transform coder (ACT) for speech signals is simulated; the code is essentially free from frame rate noise and has a better spectral resolution that DCT-based ATC systems.>

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Metadata

Authors
Malvar, H. S.
Venue
IEEE Transactions on Acoustics, Speech, and Signal Processing
Published
1990-06
Volume
38
Issue
6
Pages
969-978
ISSN
0096-3518 (ISSN-L)
OpenAlex
W2027735369
Cited by
398
References
11
FWCI
20.61
Type
journal article
Language
en
Open access
closed

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CoChat. (2026). Citation check: Lapped transforms for efficient transform/subband coding. https://app.cochat.ai/papers/10.1109/29.56057
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Malvar, H. S. (1990). Lapped transforms for efficient transform/subband coding. IEEE Transactions on Acoustics, Speech, and Signal Processing. https://doi.org/10.1109/29.56057

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