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Paynter Filter Pole Locations

Started by larkjon March 15, 2005


I'm interested in equations for the pole locations of the Paynter
filter. The publication "The Lightning Empericist" has the equations
for the even order Paynter filter pole locations, and for the third
order pole locations, but no equations for higher odd order filters. The Paynter filter is an approximation to a linear phase filter. The
linear phase approximation is exact at integer multiples of w0/4,
where
w0 is the cutoff frequency. It is not an equi-ripple filter. The
values of the successive phase error ripple peaks increase with
frequency.