- Xarray, shape (…, wsize / 2 + 1, n_step)
- The STFT coefficients for positive frequencies. 
- tstepint
- Step between successive windows in samples (must be a multiple of 2,
a divider of wsize and smaller than wsize/2) (default: wsize/2). 
- Txint
- Length of returned signal. If None Tx = n_step * tstep.