TCustomButterworthFilter

type TCustomButterworthFilter = class(TCustomOrderFilter,IDspProcessor32,IDspProcessor64)

protected

  FDownsamplePow: Integer;

  FDownsampleFak: Integer;

  FFilterGain: Double;

  FOrderInv: Double;

  FPiHalfOrderInv: Double;

  FExpOrdPiHalf: TComplex64;

  FTanW0: Double;

  FCoeffs: array [0..63] of Double;

  FState: array [0..63] of Double;

  FStateStack: array of array [0..63] of Double;

  procedure CalculateW0; override;

  class function GetMaxOrder; override;

  procedure OrderChanged; override;

  procedure AssignTo(); override;

public

  constructor Create(); override;

  function MagnitudeLog10(); override;

  procedure SetFilterValues(); virtual;

  procedure ResetStates; override;

  procedure Reset; override;

  procedure PushStates; override;

  procedure PopStates; override;

  procedure ResetStatesInt64; override;

  function Imaginary(); override;

  function Real(); override;

  property DownsampleAmount: Integer; [rw]

  property DownsampleFaktor: Integer; [r]

end;

TCustomButterworthFilter

TCustomOrderFilter,IDspProcessor32,IDspProcessor64

TCustomGainFrequencyFilter

TCustomFilterWithOrder

TCustomFilter

TDspSampleRatePersistent,IDspProcessor32,IDspProcessor64

TDspPersistent

TNotifiablePersistent

TObject