bowed.h

来自「Mobile STK for Symbian OS V0.1」· C头文件 代码 · 共 87 行

/***************************************************/
/*! \class Bowed
    \brief STK bowed string instrument class.

    This class implements a bowed string model, a
    la Smith (1986), after McIntyre, Schumacher,
    Woodhouse (1983).

    This is a digital waveguide model, making its
    use possibly subject to patents held by
    Stanford University, Yamaha, and others.

    Control Change Numbers: 
       - Bow Pressure = 2
       - Bow Position = 4
       - Vibrato Frequency = 11
       - Vibrato Gain = 1
       - Volume = 128

    by Perry R. Cook and Gary P. Scavone, 1995 - 2005.
*/
/***************************************************/

#ifndef STK_BOWED_H
#define STK_BOWED_H

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

class Bowed : public Instrmnt
{
 public:
  //! Class constructor, taking the lowest desired playing frequency.
  Bowed(StkFloat lowestFrequency);

  //! Class destructor.
  ~Bowed();

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

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

  //! Set vibrato gain.
  void setVibrato(StkFloat gain);

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

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

  //! 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 );

  DelayL   neckDelay_;
  DelayL   bridgeDelay_;
  BowTable bowTable_;
  OnePole  stringFilter_;
  BiQuad   bodyFilter_;
  SineWave vibrato_;
  ADSR     adsr_;
  StkFloat maxVelocity_;
  StkFloat baseDelay_;
  StkFloat vibratoGain_;
  StkFloat betaRatio_;

};

#endif