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BandedWG.h

/***************************************************/
/*! \class BandedWG
    \brief Banded waveguide modeling class.

    This class uses banded waveguide techniques to
    model a variety of sounds, including bowed
    bars, glasses, and bowls.  For more
    information, see Essl, G. and Cook, P. "Banded
    Waveguides: Towards Physical Modelling of Bar
    Percussion Instruments", Proceedings of the
    1999 International Computer Music Conference.

    Control Change Numbers: 
       - Bow Pressure = 2
       - Bow Motion = 4
       - Strike Position = 8 (not implemented)
       - Vibrato Frequency = 11
       - Gain = 1
       - Bow Velocity = 128
       - Set Striking = 64
       - Instrument Presets = 16
         - Uniform Bar = 0
         - Tuned Bar = 1
         - Glass Harmonica = 2
         - Tibetan Bowl = 3

    by Georg Essl, 1999 - 2004.
    Modified for Stk 4.0 by Gary Scavone.
*/
/***************************************************/

#ifndef STK_BANDEDWG_H
#define STK_BANDEDWG_H

const int MAX_BANDED_MODES = 20;

#include "Instrmnt.h"
#include "DelayL.h"
#include "BowTable.h"
#include "ADSR.h"
#include "BiQuad.h"

00043 class BandedWG : public Instrmnt
{
 public:
  //! Class constructor.
  BandedWG();

  //! Class destructor.
  ~BandedWG();

  //! Reset and clear all internal state.
  void clear();

  //! Set strike position (0.0 - 1.0).
  void setStrikePosition(StkFloat position);

  //! Select a preset.
  void setPreset(int preset);

  //! Set instrument parameters for a particular frequency.
  void setFrequency(StkFloat frequency);

  //! Apply bow velocity/pressure to instrument with given amplitude and rate of increase.
  void startBowing(StkFloat amplitude, StkFloat rate);

  //! Decrease bow velocity/breath pressure with given rate of decrease.
  void stopBowing(StkFloat rate);

  //! Pluck the instrument with given amplitude.
  void pluck(StkFloat amp);

  //! Start a note with the given frequency and amplitude.
  void noteOn(StkFloat frequency, StkFloat amplitude);

  //! Stop a note with the given amplitude (speed of decay).
  void noteOff(StkFloat amplitude);

  //! Perform the control change specified by \e number and \e value (0.0 - 128.0).
  void controlChange(int number, StkFloat value);

 protected:

  StkFloat computeSample( void );

  bool doPluck_;
  bool trackVelocity_;
  int nModes_;
  int presetModes_;
  BowTable bowTable_;
  ADSR     adsr_;
  BiQuad   bandpass_[MAX_BANDED_MODES];
  DelayL   delay_[MAX_BANDED_MODES];
  StkFloat maxVelocity_;
  StkFloat modes_[MAX_BANDED_MODES];
  StkFloat frequency_;
  StkFloat baseGain_;
  StkFloat gains_[MAX_BANDED_MODES];
  StkFloat basegains_[MAX_BANDED_MODES];
  StkFloat excitation_[MAX_BANDED_MODES];
  StkFloat integrationConstant_;
  StkFloat velocityInput_;
  StkFloat bowVelocity_;
  StkFloat bowTarget_;
  StkFloat bowPosition_;
  StkFloat strikeAmp_;
  int strikePosition_;

};

#endif

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