NDLI: A perceptually reweighted mixed-norm method for sparse approximation of audio signals

Content Provider	IEEE Xplore Digital Library
Author	Christensen, M.G. Sturm, B.L.
Copyright Year	2011
Description	Author affiliation: Dept. of Architecture, Design & Media Technology, Aalborg University, Denmark (Christensen, M.G.; Sturm, B.L.)
Abstract	In this paper, we consider the problem of finding sparse representations of audio signals for coding purposes. In doing so, it is of utmost importance that when only a subset of the present components of an audio signal are extracted, it is the perceptually most important ones. To this end, we propose a new iterative algorithm based on two principles: 1) a reweighted 1-norm based measure of sparsity; and 2) a reweighted 2-norm based measure of perceptual distortion. Using these measures, the considered problem is posed as a constrained convex optimization problem that can be solved optimally using standard software. A prominent feature of the new method is that it solves a problem that is closely related to the objective of coding, namely rate-distortion optimization. In computer simulations, we demonstrate the properties of the algorithm and its application to real audio signals.
Starting Page	575
Ending Page	579
File Size	575433
Page Count	5
File Format	PDF
ISBN	9781467303217
ISSN	10586393
e-ISBN	9781467303231
DOI	10.1109/ACSSC.2011.6190067
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2011-11-06
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Vectors Distortion measurement Dictionaries Matching pursuit algorithms Encoding Speech Spectrogram audio modeling Audio coding sparse approximations perceptual distortion measures
Content Type	Text
Resource Type	Article
Subject	Signal Processing Computer Networks and Communications

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3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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