Recasting the (Synchrosqueezed) Short-Time Fourier Transform as an Instantaneous Spectrum

In a previous work, we proposed a time-frequency analysis called instantaneous spectral analysis (ISA), which generalizes the notion of the Fourier spectrum and in which instantaneous frequency is utilized to the fullest extent. In this paper, we recast both the Fourier transform (FT) and filterbank...

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Bibliographic Details
Published in:Entropy (Basel, Switzerland) Switzerland), 2022-04, Vol.24 (4), p.518
Main Authors: Sandoval, Steven, De Leon, Phillip L
Format: Article
Language:English
Subjects:
Fourier transforms
Frequency distribution
frequency-domain analysis
signal analysis
signal representation
Spectra
spectral analysis
Spectrum analysis
Time-frequency analysis
Variables
Visualization
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Summary:In a previous work, we proposed a time-frequency analysis called instantaneous spectral analysis (ISA), which generalizes the notion of the Fourier spectrum and in which instantaneous frequency is utilized to the fullest extent. In this paper, we recast both the Fourier transform (FT) and filterbank (FB) interpretations of the short-time Fourier transform (STFT) as instantaneous spectra. We show that to recast the FB interpretation of STFT as an instantaneous spectrum with valid structure, frequency reassignment is a fundamental necessity, thus demonstrating that this IS is closely related to the synchrosqueezed STFT. This result provides a new theoretical motivation for the synchrosqueezed STFT. Finally, we illustrate through example the instantaneous spectra corresponding to the FT and FB interpretations of STFT using two closed-form examples.
ISSN:1099-4300
1099-4300
DOI:10.3390/e24040518