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IIRFilters.EllipticFilter Method (integer, TSample, TSample, array of TSample, TFilterType, boolean, TVec, TVec, TSample, TIirFrequencyTransform)
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Design Elliptic IIR filter.

C#
public double EllipticFilter(int Order, double PassRipple, double StopRipple, double[] CutoffFreq, TFilterType FilterType, bool Analog, TVec z, TVec p, ref double k, TIirFrequencyTransform IirFrequencyTransform);
Remarks

Design Elliptic filter of Order with CutoffFreq frequencies and of FilterType type. Set Analog to True, to request an analog filter design in s-plane or set it to false to obtain a digital filter design in z-plane. CutoffFreq must be in range between 0 and 1 (Sampling frequency = 2) in case of a digital filter design. 

IIrFrequencyTransform specifies when and how will the frequency band transformation be applied. PassRipple defines the passband ripple in dB and StopRipple defines the stopband ripple in dB. The resulting transfer function is returned in the zero-pole form, with z,p,k variables.

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