scipy.fftpack.

ihilbert

scipy.fftpack.ihilbert(x, _cache=<_thread._local object>)

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:

y_j = -sqrt(-1)*sign(j) * x_j
y_0 = 0