## void MtVectorAttributes | ## (float a[], I32 ia, float env[], I32 ib, |

Provides a magnitude and phase envelope of the input by taking an FFT, removing the top half of the frequencies, taking the inverse FFT and then calculating the inverse FFT, yielding a filtered version of the input.

Provides a magnitude and phase envelope of the input by taking an FFT, removing the top half of the frequencies, taking the inverse FFT and then calculating the inverse FFT, yielding a filtered version of the input.

**Parameters:****a**- the input vector.**ia**- the stride through a, in words and samples: ia=1 is every sample, ia=2 is every other sample.**env**- the envelope, i.e. the magnitude of the filtered version.**ib**- the stride through the env.**ifq**- the phase of the filtered input.**ic**- the stride through the phase array.**n**- the number of points in the input and output arrays.**Returns:**- none.

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