mirror of
https://github.com/thestk/stk
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95 lines
2.5 KiB
C++
95 lines
2.5 KiB
C++
/***************************************************/
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/*! \class Wurley
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\brief STK Wurlitzer electric piano FM
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synthesis instrument.
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This class implements two simple FM Pairs
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summed together, also referred to as algorithm
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5 of the TX81Z.
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\code
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Algorithm 5 is : 4->3--\
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+ --> Out
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2->1--/
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\endcode
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Control Change Numbers:
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- Modulator Index One = 2
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- Crossfade of Outputs = 4
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- LFO Speed = 11
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- LFO Depth = 1
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- ADSR 2 & 4 Target = 128
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The basic Chowning/Stanford FM patent expired
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in 1995, but there exist follow-on patents,
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mostly assigned to Yamaha. If you are of the
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type who should worry about this (making
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money) worry away.
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by Perry R. Cook and Gary P. Scavone, 1995--2019.
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*/
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/***************************************************/
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#include "Wurley.h"
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namespace stk {
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Wurley :: Wurley( void )
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: FM()
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{
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// Concatenate the STK rawwave path to the rawwave files
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for ( unsigned int i=0; i<3; i++ )
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waves_[i] = new FileLoop( (Stk::rawwavePath() + "sinewave.raw").c_str(), true );
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waves_[3] = new FileLoop( (Stk::rawwavePath() + "fwavblnk.raw").c_str(), true );
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this->setRatio(0, 1.0);
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this->setRatio(1, 4.0);
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this->setRatio(2, -510.0);
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this->setRatio(3, -510.0);
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gains_[0] = fmGains_[99];
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gains_[1] = fmGains_[82];
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gains_[2] = fmGains_[92];
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gains_[3] = fmGains_[68];
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adsr_[0]->setAllTimes( 0.001, 1.50, 0.0, 0.04);
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adsr_[1]->setAllTimes( 0.001, 1.50, 0.0, 0.04);
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adsr_[2]->setAllTimes( 0.001, 0.25, 0.0, 0.04);
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adsr_[3]->setAllTimes( 0.001, 0.15, 0.0, 0.04);
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twozero_.setGain( 2.0 );
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vibrato_.setFrequency( 8.0 );
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}
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Wurley :: ~Wurley( void )
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{
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}
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void Wurley :: setFrequency( StkFloat frequency )
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{
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#if defined(_STK_DEBUG_)
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if ( frequency <= 0.0 ) {
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oStream_ << "Wurley::setFrequency: argument is less than or equal to zero!";
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handleError( StkError::WARNING ); return;
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}
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#endif
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baseFrequency_ = frequency;
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waves_[0]->setFrequency( baseFrequency_ * ratios_[0]);
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waves_[1]->setFrequency( baseFrequency_ * ratios_[1]);
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waves_[2]->setFrequency( ratios_[2] ); // Note here a 'fixed resonance'.
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waves_[3]->setFrequency( ratios_[3] );
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}
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void Wurley :: noteOn( StkFloat frequency, StkFloat amplitude )
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{
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gains_[0] = amplitude * fmGains_[99];
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gains_[1] = amplitude * fmGains_[82];
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gains_[2] = amplitude * fmGains_[82];
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gains_[3] = amplitude * fmGains_[68];
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this->setFrequency( frequency );
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this->keyOn();
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}
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} // stk namespace
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