mirror of
https://github.com/thestk/stk
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91 lines
2.4 KiB
C++
91 lines
2.4 KiB
C++
/***************************************************/
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/*! \class Resonate
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\brief STK noise driven formant filter.
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This instrument contains a noise source, which
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excites a biquad resonance filter, with volume
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controlled by an ADSR.
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Control Change Numbers:
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- Resonance Frequency (0-Nyquist) = 2
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- Pole Radii = 4
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- Notch Frequency (0-Nyquist) = 11
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- Zero Radii = 1
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- Envelope Gain = 128
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by Perry R. Cook and Gary P. Scavone, 1995 - 2004.
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*/
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/***************************************************/
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#ifndef STK_RESONATE_H
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#define STK_RESONATE_H
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#include "Instrmnt.h"
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#include "ADSR.h"
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#include "BiQuad.h"
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#include "Noise.h"
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class Resonate : public Instrmnt
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{
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public:
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//! Class constructor.
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Resonate();
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//! Class destructor.
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~Resonate();
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//! Reset and clear all internal state.
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void clear();
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//! Set the filter for a resonance at the given frequency (Hz) and radius.
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void setResonance(StkFloat frequency, StkFloat radius);
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//! Set the filter for a notch at the given frequency (Hz) and radius.
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void setNotch(StkFloat frequency, StkFloat radius);
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//! Set the filter zero coefficients for contant resonance gain.
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void setEqualGainZeroes();
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//! Initiate the envelope with a key-on event.
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void keyOn();
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//! Signal a key-off event to the envelope.
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void keyOff();
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//! Start a note with the given frequency and amplitude.
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void noteOn(StkFloat frequency, StkFloat amplitude);
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//! Stop a note with the given amplitude (speed of decay).
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void noteOff(StkFloat amplitude);
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//! Compute one output sample.
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StkFloat tick();
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//! Computer \e vectorSize outputs and return them in \e vector.
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StkFloat *tick(StkFloat *vector, unsigned int vectorSize);
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//! Fill a channel of the StkFrames object with computed outputs.
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/*!
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The \c channel argument should be one or greater (the first
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channel is specified by 1). An StkError will be thrown if the \c
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channel argument is zero or it is greater than the number of
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channels in the StkFrames object.
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*/
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StkFrames& tick( StkFrames& frames, unsigned int channel = 1 );
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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, StkFloat value);
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protected:
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ADSR adsr_;
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BiQuad filter_;
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Noise noise_;
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StkFloat poleFrequency_;
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StkFloat poleRadius_;
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StkFloat zeroFrequency_;
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StkFloat zeroRadius_;
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};
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#endif
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