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127 lines
3.5 KiB
C++
127 lines
3.5 KiB
C++
#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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namespace stk {
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/***************************************************/
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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, 1995-2012.
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*/
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/***************************************************/
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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( void );
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//! Class destructor.
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~Resonate( void );
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//! Reset and clear all internal state.
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void clear( void );
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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( void ) { filter_.setEqualGainZeroes(); };
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//! Initiate the envelope with a key-on event.
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void keyOn( void ) { adsr_.keyOn(); };
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//! Signal a key-off event to the envelope.
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void keyOff( void ) { adsr_.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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//! 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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//! Compute and return one output sample.
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StkFloat tick( unsigned int channel = 0 );
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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 must be less than the number of
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channels in the StkFrames argument (the first channel is specified
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by 0). However, range checking is only performed if _STK_DEBUG_
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is defined during compilation, in which case an out-of-range value
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will trigger an StkError exception.
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*/
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StkFrames& tick( StkFrames& frames, unsigned int channel = 0 );
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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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inline StkFloat Resonate :: tick( unsigned int )
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{
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lastFrame_[0] = filter_.tick( noise_.tick() );
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lastFrame_[0] *= adsr_.tick();
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return lastFrame_[0];
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}
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inline StkFrames& Resonate :: tick( StkFrames& frames, unsigned int channel )
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{
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unsigned int nChannels = lastFrame_.channels();
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#if defined(_STK_DEBUG_)
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if ( channel > frames.channels() - nChannels ) {
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oStream_ << "Resonate::tick(): channel and StkFrames arguments are incompatible!";
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handleError( StkError::FUNCTION_ARGUMENT );
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}
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#endif
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StkFloat *samples = &frames[channel];
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unsigned int j, hop = frames.channels() - nChannels;
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if ( nChannels == 1 ) {
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for ( unsigned int i=0; i<frames.frames(); i++, samples += hop )
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*samples++ = tick();
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}
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else {
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for ( unsigned int i=0; i<frames.frames(); i++, samples += hop ) {
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*samples++ = tick();
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for ( j=1; j<nChannels; j++ )
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*samples++ = lastFrame_[j];
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}
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}
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return frames;
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}
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} // stk namespace
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#endif
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