mirror of
https://github.com/thestk/stk
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96 lines
2.5 KiB
C++
96 lines
2.5 KiB
C++
/***************************************************/
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/*! \class StifKarp
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\brief STK plucked stiff string instrument.
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This class implements a simple plucked string
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algorithm (Karplus Strong) with enhancements
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(Jaffe-Smith, Smith, and others), including
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string stiffness and pluck position controls.
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The stiffness is modeled with allpass filters.
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This is a digital waveguide model, making its
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use possibly subject to patents held by
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Stanford University, Yamaha, and others.
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Control Change Numbers:
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- Pickup Position = 4
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- String Sustain = 11
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- String Stretch = 1
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by Perry R. Cook and Gary P. Scavone, 1995 - 2002.
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*/
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/***************************************************/
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#if !defined(__StifKarp_h)
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#define __StifKarp_h
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#include "Instrmnt.h"
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#include "DelayL.h"
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#include "DelayA.h"
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#include "OneZero.h"
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#include "Noise.h"
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#include "BiQuad.h"
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class StifKarp : public Instrmnt
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{
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public:
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//! Class constructor, taking the lowest desired playing frequency.
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StifKarp(MY_FLOAT lowestFrequency);
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//! Class destructor.
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~StifKarp();
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//! Reset and clear all internal state.
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void clear();
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//! Set instrument parameters for a particular frequency.
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void setFrequency(MY_FLOAT frequency);
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//! Set the stretch "factor" of the string (0.0 - 1.0).
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void setStretch(MY_FLOAT stretch);
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//! Set the pluck or "excitation" position along the string (0.0 - 1.0).
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void setPickupPosition(MY_FLOAT position);
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//! Set the base loop gain.
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/*!
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The actual loop gain is set according to the frequency.
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Because of high-frequency loop filter roll-off, higher
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frequency settings have greater loop gains.
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*/
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void setBaseLoopGain(MY_FLOAT aGain);
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//! Pluck the string with the given amplitude using the current frequency.
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void pluck(MY_FLOAT amplitude);
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//! Start a note with the given frequency and amplitude.
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void noteOn(MY_FLOAT frequency, MY_FLOAT amplitude);
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//! Stop a note with the given amplitude (speed of decay).
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void noteOff(MY_FLOAT amplitude);
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//! Compute one output sample.
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MY_FLOAT tick();
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//! Perform the control change specified by \e number and \e value (0.0 - 128.0).
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void controlChange(int number, MY_FLOAT value);
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protected:
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DelayA *delayLine;
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DelayL *combDelay;
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OneZero *filter;
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Noise *noise;
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BiQuad *biQuad[4];
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long length;
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MY_FLOAT loopGain;
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MY_FLOAT baseLoopGain;
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MY_FLOAT lastFrequency;
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MY_FLOAT lastLength;
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MY_FLOAT stretching;
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MY_FLOAT pluckAmplitude;
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MY_FLOAT pickupPosition;
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};
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#endif
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