text: Orthogonal spectra to the dynamic dataset E are obtained with the Hilbert-transform:
  where:
  *Ψ is the 2D asynchronous spectrum
  *ν en ν are two spectral channels
  *y is the vector composed of the signal intensities in E in column ν
  *n the number of signals in the original dataset
  *N the Noda-Hilbert transform matrix
  The values of N, N are determined as follows:
  *0 if j = k
  * if j ≠ k
  where:
  *j the row number
  *k the column number