Return 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
For even len(x), the Nyquist mode of x is taken zero.
scipy.fftpack.itilbert
scipy.fftpack.ihilbert
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