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.

Documentation

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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Prepared for University of Minnesota, October, 2001