mirror of
https://github.com/thestk/stk
synced 2026-01-11 20:11:52 +00:00
86 lines
2.3 KiB
C++
86 lines
2.3 KiB
C++
/***************************************************/
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/*! \class PercFlut
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\brief STK percussive flute FM synthesis instrument.
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This class implements algorithm 4 of the TX81Z.
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\code
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Algorithm 4 is : 4->3--\
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2-- + -->1-->Out
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\endcode
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Control Change Numbers:
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- Total Modulator Index = 2
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- Modulator Crossfade = 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--2017.
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*/
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/***************************************************/
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#include "PercFlut.h"
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namespace stk {
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PercFlut :: PercFlut( 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, 1.50 * 1.000);
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this->setRatio(1, 3.00 * 0.995);
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this->setRatio(2, 2.99 * 1.005);
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this->setRatio(3, 6.00 * 0.997);
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gains_[0] = fmGains_[99];
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gains_[1] = fmGains_[71];
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gains_[2] = fmGains_[93];
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gains_[3] = fmGains_[85];
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adsr_[0]->setAllTimes( 0.05, 0.05, fmSusLevels_[14], 0.05);
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adsr_[1]->setAllTimes( 0.02, 0.50, fmSusLevels_[13], 0.5);
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adsr_[2]->setAllTimes( 0.02, 0.30, fmSusLevels_[11], 0.05);
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adsr_[3]->setAllTimes( 0.02, 0.05, fmSusLevels_[13], 0.01);
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twozero_.setGain( 0.0 );
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modDepth_ = 0.005;
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}
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PercFlut :: ~PercFlut( void )
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{
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}
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void PercFlut :: 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_ << "PercFlut::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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}
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void PercFlut :: noteOn( StkFloat frequency, StkFloat amplitude )
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{
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gains_[0] = amplitude * fmGains_[99] * 0.5;
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gains_[1] = amplitude * fmGains_[71] * 0.5;
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gains_[2] = amplitude * fmGains_[93] * 0.5;
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gains_[3] = amplitude * fmGains_[85] * 0.5;
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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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