IIRFilter.h

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// ----------------------------------------------------------------------------
//
// $Id$
//
// Copyright 2008, 2009, 2010, 2011, 2012  Antonio Franchi and Paolo Stegagno    
//
// This file is part of MIP.
//
// MIP is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// MIP is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with MIP. If not, see <http://www.gnu.org/licenses/>.
//
// Contact info: antonio.franchi@tuebingen.mpg.de stegagno@diag.uniroma1.it
//
// ----------------------------------------------------------------------------



#ifndef __IIR_FILTER_H_
#define __IIR_FILTER_H_

#ifdef MIP_HOST_APPLE
#include <applePatch.h>
#endif

#include <vector>
#include <list>

#include<baselib.h>


using namespace MipBaselib;

/* @{ */


// esempio per order = 3
// implementa la funzione di trasferimento:
// _inCoeff[0]  +  _inCoeff[1] z +  _inCoeff[2] z^2 + _inCoeff[3] z^3
// ------------------------------------------------------------------
//      _outCoeff[0] + _outCoeff[1] z + _outCoeff[2] z^2 + z^3
//
// ossia
//
//y[t] =  _inCoeff[0] * u[t-3] +  _inCoeff[1] * u[t-2] +  _inCoeff[2] * u[t-1] + _inCoeff[3] * u[t]
//   - _outCoeff[0] * y[t-3] - _outCoeff[1] * y[t-2] - _outCoeff[2] * y[t-1]

class IIRFilter{
 private:
  vector< vector<Decimal> > _inCoeff;
  vector<Decimal> _outCoeff;
  vector< list<Decimal> > _pastIns;
  list<Decimal> _pastOuts;
  int _order;
  int _inNum;
  list<Decimal>::iterator outIt,inIt;
  int iCo,iIn;
  
  void _kernelConstructor(vector< vector<Decimal> > &inputCoeff,vector<Decimal> &outputCoeff);
 public:
  
  IIRFilter(vector<Decimal> &inputCoeff,vector<Decimal> &outputCoef);
  
  IIRFilter(vector< vector<Decimal> > &inputCoeff,vector<Decimal> &outputCoef);
  
  
  
  
  ~IIRFilter();

  IIRFilter(const IIRFilter& t);
  
  IIRFilter& operator=(const IIRFilter& t);
  
  void step(const Decimal &in,Decimal& out);
  
  void step(const vector<Decimal>& in,Decimal& out);
};

/* @} */

#endif