STFT


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STFT

Short Term Fourier Transform
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Abbreviations: AIS = American Spinal Injury Association Impairment Scale, APAC = alternating-pressure air cushion, CMS = Centers for Medicare and Medicaid Services, Int1 = intervention phase 1, Int2 = intervention phase 2, IP = interface pressure, IPR = independent pressure relief, LDF = laser Doppler flowmetry, NIDRR = National Institute on Disability and Rehabilitation Research, PU = pressure ulcer, Q1 = quiet sitting 1 (preintervention), Q2 = quiet sitting 2 (postintervention), REDCap = Research Electronic Data Capture, ROI = region of interest, SCI = spinal cord injury, STFT = short-time Fourier transform, [T.
Once the window g(t) is chosen, the STFT resolution is fixed over the entire time-frequency plane.
The magnitude squared of the STFT yields the spectrogram of the function.
Sampling the STFT on a lattice [LAMBDA] then leads to the Gabor transform, which, for the sake of clarity, is denoted by [C.
The next corollary deals with the approximation error occurring in the case of approximating an STFT multiplier by a Gabor multiplier.