### Navigation

- index
- modules |
- modules |
- next |
- previous |
- SciPy v0.12 Reference Guide (DRAFT) »
- Discrete Fourier transforms (`scipy.fftpack`) »

# scipy.fftpack.itilbert

`scipy.fftpack.``itilbert`(x, h, period=None, _cache={})

  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`.

### Navigation

- index
- modules |
- modules |
- next |
- previous |
- SciPy v0.12 Reference Guide (DRAFT) »
- Discrete Fourier transforms (`scipy.fftpack`) »