scipy.fftpack. itilbert# scipy.fftpack.itilbert(x, h, period=None, _cache={})[source]# Return inverse h-Tilbert transform of a periodic sequence x. If x_j and y_j are Fourier coefficients of periodic functions x and y, respectively, then: y_j = -sqrt(-1)*tanh(j*h*2*pi/period) * x_j y_0 = 0 For more details, see tilbert.