com.oregondsp.signalProcessing.filter.iir
Classes 
Allpass
AnalogButterworth
AnalogChebyshevI
AnalogChebyshevII
AnalogPrototype
Butterworth
ChebyshevI
ChebyshevII
Complex
IIRFilter
Polynomial
Rational
SecondOrderSection
ThiranAllpass
Enums 
PassbandType