NDLI: Time-frequency signal analysis: issues and alternative methods

Content Provider	IEEE Xplore Digital Library
Author	Marple Jr., S.L.
Copyright Year	1998
Description	Author affiliation: Orincon Corp., San Diego, CA, USA (Marple, S.L., Jr.)
Abstract	The classical technique for characterizing the time evolution behavior of nonstationary signals is the short-time Fourier transform (STFT), a linear time-frequency representation (TFR) analysis technique. Beginning with the Wigner-Ville function (WVF), a plethora of quadratic TFR techniques have been introduced in an attempt to improve the time-vs.-frequency resolving detail over that achievable with the STFT. This paper makes the case that this improvement, in practice, is approximately a factor of only two and cannot be achieved without the introduction of non-negligible cross-term artifacts and the sacrifice of detectable dynamic range. Two alternative TFR techniques are defined and demonstrated with capabilities to achieve the factor of two detail improvement without the cross-term artifacts and dynamic range degradation inherent with quadratic TFR techniques. One alternative, based on a variant of two-dimensional (2-D) minimum variance spectral analysis, exploits two new 2-D functions: the windowed data function (WDF) and the transformed WDF function (TWF). The other alternative is based on subspace-enhanced linear predictive extrapolation. An additional contribution of this paper is an analysis procedure for handling persistent nonstationary signals, in contrast to most TFR methods found in the literature that deal with short-duration (transient) nonstationary signal events.
Starting Page	329
Ending Page	332
File Size	576383
Page Count	4
File Format	PDF
ISBN	0780350731
DOI	10.1109/TFSA.1998.721427
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1998-10-09
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Time frequency analysis Signal analysis Dynamic range Two dimensional displays Fourier transforms Signal resolution Degradation Spectral analysis Extrapolation Transient analysis
Content Type	Text
Resource Type	Article

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