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IIRFilters.EllipticFilter Function
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The resulting transfer function is returned in the second order section form stored in the sos variable.

Pascal
function EllipticFilter(Order: integer; PassRipple: double; StopRipple: double; const CutoffFreq: array of double; FilterType: TFilterType; Analog: boolean; const sos: TVec; IirFrequencyTransform: TIirFrequencyTransform = ftStateSpaceAnalog): double; overload;
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Description

The sos variable can be passed directly to the IirInitBQ digital filter initialization routine. Second order section form delivers substantially higher numerical stability and range than filtering with num/den form used by the IirInit function.

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