Package Filters

Class IIRFilterMethod

java.lang.Object
Filters.FilterMethod
Filters.IIRFilterMethod
Direct Known Subclasses:
ButterworthMethod, ChebyshevMethod
public abstract class IIRFilterMethod extends FilterMethod

  • Field Details

    • poles

      protected Complex[] poles

    • zeros

      protected Complex[] zeros

    • omega1

      protected double omega1

    • omega2

      protected double omega2

    • omega3

      protected double omega3

    • zeroValue

      protected double zeroValue

  • Constructor Details

    • IIRFilterMethod

      public IIRFilterMethod(double sampleRate, FilterParams filterParams)

  • Method Details

    • getPoles

      public Complex[] getPoles(FilterParams filterParams)

    • getZeros

      public Complex[] getZeros(FilterParams filterParams)

    • getPoleZeros

      public PoleZeroPair[] getPoleZeros()

    • poleZeroCount

      public int poleZeroCount()

    • calculateOmegaValues

      public void calculateOmegaValues()

    • getFastFilterCoefficients

      public double[] getFastFilterCoefficients()
      Get coefficients from poles and zeros for fast filter computations.
      Overrides:
      getFastFilterCoefficients in class FilterMethod
      Returns:

    • getFilterGain

      public double getFilterGain(double omega)
      Description copied from class: FilterMethod
      Get the filter gain at an angular frequency (o invalid input: '<' omega invalid input: '<' pi).
      Specified by:
      getFilterGain in class FilterMethod
      Parameters:
      omega - angular frequency
      Returns:
      gain

    • getFilterPhase

      public double getFilterPhase(double omega)
      Description copied from class: FilterMethod
      Get the filter phase at an angular frequency (o invalid input: '<' omega invalid input: '<' pi).
      Specified by:
      getFilterPhase in class FilterMethod
      Parameters:
      omega - angular frequency
      Returns:
      phase

    • getFilterGainConstant

      public double getFilterGainConstant()
      Specified by:
      getFilterGainConstant in class FilterMethod
      Returns:
      any additional gain constant (needed for IIRF's)

    • createFilter

      public Filter createFilter(int channel)
      Specified by:
      createFilter in class FilterMethod
      Parameters:
      channel - channel number (used in filter book keeping)
      Returns:
      Create a filter object - which can actually do some filtering for us. Note that a filterMethod object may be asked to create multiple filters for multi-channel systems.