_fft_helper(x, win, detrend_func, nperseg, noverlap, nfft, sides)
This is a helper function that does the main FFT calculation for :None:None:`_spectral helper`. All input validation is performed there, and the data axis is assumed to be the last axis of x. It is not designed to be called externally. The windows are not averaged over; the result from each window is returned.
Adapted from matplotlib.mlab
Array of FFT data
Calculate windowed FFT, for internal use by :None:None:`scipy.signal._spectral_helper`.
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