void FlButterworth

In file Fl.d:

(float low_cut, float low_r_o, float high_cut,
float high_r_o, float si, I32 nsamp,
float filter[])

This routine will use fft's to make a butterworth filter in the time domain.

This routine will use fft's to make a butterworth filter in the time domain.


Parameters:: low_cut - is the low frequency cutoff of the filter in units of cycles per second.
low_r_o - is the roll off rate of the low frequency cutoff, in units of 3Db per octave.
high_cut - is the high frequency cutoff of the filter in units of cycles per second.
high_r_o - is the roll off rate of the high frquency cutoff, in units of 3Db per octave.
si - is the sample rate of the filter, in units of seconds.
nsamp - is the number of samples in the filter.
filter - is the filter trace produced.
Returns:: none.