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# numpy.fft.ihfft

`numpy.fft.``ihfft`(a, n=None, axis=-1)

  Compute the inverse FFT of a signal whose spectrum has Hermitian symmetry.

  Parameters : | a : array_like Input array. n : int, optional Length of the inverse FFT. axis : int, optional Axis over which to compute the inverse FFT, assuming Hermitian symmetry of the spectrum. Default is the last axis.
  Returns : | out : ndarray The transformed input.

  See also

  `hfft`, `irfft`

  Notes

  `hfft`/`ihfft` are a pair analogous to `rfft`/`irfft`, but for the opposite case: here the signal is real in the frequency domain and has Hermite symmetry in the time domain. So here it’s `hfft` for which you must supply the length of the result if it is to be odd: `ihfft(hfft(a), len(a)) == a`, within numerical accuracy.

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