BandFilter.h

/*                                                         
** Copyright (C) 2008, 2009 Ricard Marxer <email@ricardmarxer.com>
**                                                                  
** This program 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 2 of the License, or   
** (at your option) any later version.                                 
**                                                                     
** This program 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 this program; if not, write to the Free Software         
** Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
*/                                                                          

#ifndef BANDFILTER_H
#define BANDFILTER_H

#include "Typedefs.h"
#include "Debug.h"

#include "Filter.h"
#include "FilterUtils.h"

class BandFilter {
public:
  enum FilterType {
    CHEBYSHEVI = 0 ,
    CHEBYSHEVII = 1 ,
    BUTTERWORTH = 2 ,
    BESSEL = 3 
  };

  enum BandType {
    LOWPASS = 0 ,
    HIGHPASS = 1 ,
    BANDPASS = 2 ,
    BANDSTOP = 3 
  };

protected:
  int _order;
  Real _lowFrequency;
  Real _highFrequency;
  Real _passRipple;
  Real _stopAttenuation;
  int _channelCount;
  
  Filter _filter;

  FilterType _filterType;
  BandType _bandType;
  
public:
  BandFilter(int order = 4, Real lowFrequency = 0.0, Real highFrequency = 1.0, BandType bandType = LOWPASS, FilterType filterType = CHEBYSHEVII, Real ripplePass = 0.05, Real attenuationStop = 40.0);

  void setup();
  void reset();

  void process( const MatrixXR& samples, MatrixXR* filtered );

  void a( MatrixXR* a ) const;
  
  void b( MatrixXR* b ) const;

  int order() const;

  void setOrder( int order, bool callSetup = true );

  Real lowFrequency() const;  

  void setLowFrequency( Real frequency, bool callSetup = true );

  Real highFrequency() const;  

  void setHighFrequency( Real frequency, bool callSetup = true );

  FilterType filterType() const;

  void setFilterType( FilterType type, bool callSetup = true );

  BandType bandType() const;

  void setBandType( BandType type, bool callSetup = true );

  Real passRipple() const;

  void setPassRipple( Real rippleDB, bool callSetup = true );

  Real stopAttenuation() const;

  void setStopAttenuation( Real attenuationDB, bool callSetup = true );
};

#endif  /* BANDFILTER_H */

---