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/***************************************************/
/*! \class PluckTwo
\brief STK enhanced plucked string model class.
This class implements an enhanced two-string,
plucked physical model, a la Jaffe-Smith,
Smith, and others.
PluckTwo is an abstract class, with no excitation
specified. Therefore, it can't be directly
instantiated.
This is a digital waveguide model, making its
use possibly subject to patents held by
Stanford University, Yamaha, and others.
by Perry R. Cook and Gary P. Scavone, 1995 - 2005.
*/
/***************************************************/
#ifndef STK_PLUCKTWO_H
#define STK_PLUCKTWO_H
#include "Instrmnt.h"
#include "DelayL.h"
#include "DelayA.h"
#include "OneZero.h"
namespace Nyq
{
class PluckTwo : public Instrmnt
{
public:
//! Class constructor, taking the lowest desired playing frequency.
PluckTwo(StkFloat lowestFrequency);
//! Class destructor.
virtual ~PluckTwo();
//! Reset and clear all internal state.
void clear();
//! Set instrument parameters for a particular frequency.
virtual void setFrequency(StkFloat frequency);
//! Detune the two strings by the given factor. A value of 1.0 produces unison strings.
void setDetune(StkFloat detune);
//! Efficient combined setting of frequency and detuning.
void setFreqAndDetune(StkFloat frequency, StkFloat detune);
//! Set the pluck or "excitation" position along the string (0.0 - 1.0).
void setPluckPosition(StkFloat position);
//! Set the base loop gain.
/*!
The actual loop gain is set according to the frequency.
Because of high-frequency loop filter roll-off, higher
frequency settings have greater loop gains.
*/
void setBaseLoopGain(StkFloat aGain);
//! Stop a note with the given amplitude (speed of decay).
virtual void noteOff(StkFloat amplitude);
protected:
virtual StkFloat computeSample( void ) = 0;
DelayA delayLine_;
DelayA delayLine2_;
DelayL combDelay_;
OneZero filter_;
OneZero filter2_;
unsigned long length_;
StkFloat loopGain_;
StkFloat baseLoopGain_;
StkFloat lastFrequency_;
StkFloat lastLength_;
StkFloat detuning_;
StkFloat pluckAmplitude_;
StkFloat pluckPosition_;
};
} // namespace Nyq
#endif
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