scipy.fftpack
scipy.fftpack.
ihilbert
Return inverse Hilbert transform of a periodic sequence x.
If x_j and y_j are Fourier coefficients of periodic functions x and y, respectively, then:
x_j
y_j
y_j = -sqrt(-1)*sign(j) * x_j y_0 = 0
scipy.fftpack.hilbert
scipy.fftpack.cs_diff