Overlap-Add (OLA) Interpretation of the STFT
In the OLA interpretation of the STFT, we apply a time-shifted window
to our signal 
, selecting data near time 
, and
compute the Fourier-transform to obtain the spectrum of the
th
frame. As shown in Fig.9.1, the STFT is viewed as a
time-ordered sequence of spectra, one per frame, with the
frames overlapping in time.
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Filter-Bank Summation (FBS) Interpretation of the STFT
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WOLA Processing Steps
