HP_LP_fusion.h

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/***********************************************************************/
#ifndef HP_LP_FUSION_H_
#define HP_LP_FUSION_H_
 
#include "embedded_math.h"
 
template<typename type, typename basetype> class HP_LP_fusion
{
public:
  HP_LP_fusion( basetype feedback_tap) // feedback_tap shall be positive !
    : a1( -feedback_tap),
      old_output(0),
      old_HP_input(0)
      {}
 
  type respond( type HP_input, type LP_input)
  {
    type new_output =
        LP_input * (ONE + a1)
      - HP_input * a1
      + old_HP_input * a1
      - old_output * a1 ;
    old_HP_input = HP_input;
    old_output = new_output;
    return new_output;
  }
 
  operator type ( void) const
    {
      return old_output;
    }
 
private:
  basetype a1; // a1, value usually negative
  type old_output;
  type old_HP_input;
};
 
 
 
#endif /* HP_LP_FUSION_H_ */