STFT Short-Term Fourier Transform using a sine window.
The transformation is designed to be a tight frame that can be perfectly inverted. It only returns the positive frequencies.
array, shape (n_signals, n_times)
Containing multi-channels signal.
Length of the STFT window in samples (must be a multiple of 4).
Step between successive windows in samples (must be a multiple of 2, a divider of wsize and smaller than wsize/2) (default: wsize/2).
array, shape (n_signals, wsize // 2 + 1, n_step)
STFT coefficients for positive frequencies with
n_step = ceil(T / tstep).