Description: The S transform is variable window of short time Fourier transform (STFT) or an
extension of wavelet transform (WT). It is based on a scalable localizing Gaussian
window and supplies the frequency dependent resolution. In this tutorial, we
introduce the fundamental function of S transform and the generalized S transform.
Furthermore, we present some applications of S transform: seismogram analysis,
analysis of engine induction noise in acceleration, and power quality analysis. Then
compare the result of S transform with other time-frequency analysis and exhibit some
different windows of S transform.
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