/*******************************************/
/*
   BiQuad (2-pole, 2-zero) Filter Class,
   by Perry R. Cook, 1995-96.
   Modified by Julius Smith, 2000:
     setA1,setA2,setB1,setB2

   See books on filters to understand
   more about how this works.  Nothing
   out of the ordinary in this version.
*/
/*******************************************/

#if !defined(__BiQuad_h)
#define __BiQuad_h

#include "Filter.h"

class BiQuad : public Filter
{
protected:  
  MY_FLOAT poleCoeffs[2];
  MY_FLOAT zeroCoeffs[2];
public:
  BiQuad();
  ~BiQuad();
  void clear();
  void setA1(MY_FLOAT a1);
  void setA2(MY_FLOAT a2);
  void setB1(MY_FLOAT b1);
  void setB2(MY_FLOAT b2);
  void setPoleCoeffs(MY_FLOAT *coeffs);
  void setZeroCoeffs(MY_FLOAT *coeffs);
  void setGain(MY_FLOAT aValue);
  void setFreqAndReson(MY_FLOAT freq, MY_FLOAT reson);
  void setEqualGainZeroes();
  MY_FLOAT tick(MY_FLOAT sample);
};

#endif