mirror of
https://github.com/thestk/stk
synced 2026-01-12 12:31:53 +00:00
107 lines
3.0 KiB
C++
107 lines
3.0 KiB
C++
/***************************************************/
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/*! \class BeeThree
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\brief STK Hammond-oid organ FM synthesis instrument.
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This class implements a simple 4 operator
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topology, also referred to as algorithm 8 of
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the TX81Z.
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\code
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Algorithm 8 is :
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1 --.
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2 -\|
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+-> Out
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3 -/|
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4 --
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\endcode
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Control Change Numbers:
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- Operator 4 (feedback) Gain = 2
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- Operator 3 Gain = 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 - 2005.
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*/
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/***************************************************/
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#include "BeeThree.h"
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BeeThree :: BeeThree()
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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 WaveLoop( (Stk::rawwavePath() + "sinewave.raw").c_str(), true );
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waves_[3] = new WaveLoop( (Stk::rawwavePath() + "fwavblnk.raw").c_str(), true );
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this->setRatio(0, 0.999);
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this->setRatio(1, 1.997);
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this->setRatio(2, 3.006);
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this->setRatio(3, 6.009);
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gains_[0] = fmGains_[95];
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gains_[1] = fmGains_[95];
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gains_[2] = fmGains_[99];
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gains_[3] = fmGains_[95];
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adsr_[0]->setAllTimes( 0.005, 0.003, 1.0, 0.01);
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adsr_[1]->setAllTimes( 0.005, 0.003, 1.0, 0.01);
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adsr_[2]->setAllTimes( 0.005, 0.003, 1.0, 0.01);
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adsr_[3]->setAllTimes( 0.005, 0.001, 0.4, 0.03);
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twozero_.setGain( 0.1 );
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}
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BeeThree :: ~BeeThree()
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{
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}
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void BeeThree :: noteOn(StkFloat frequency, StkFloat amplitude)
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{
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gains_[0] = amplitude * fmGains_[95];
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gains_[1] = amplitude * fmGains_[95];
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gains_[2] = amplitude * fmGains_[99];
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gains_[3] = amplitude * fmGains_[95];
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this->setFrequency( frequency );
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this->keyOn();
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#if defined(_STK_DEBUG_)
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errorString_ << "BeeThree::NoteOn: frequency = " << frequency << ", amplitude = " << amplitude << '.';
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handleError( StkError::DEBUG_WARNING );
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#endif
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}
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StkFloat BeeThree :: computeSample()
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{
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register StkFloat temp;
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if (modDepth_ > 0.0) {
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temp = 1.0 + (modDepth_ * vibrato_.tick() * 0.1);
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waves_[0]->setFrequency(baseFrequency_ * temp * ratios_[0]);
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waves_[1]->setFrequency(baseFrequency_ * temp * ratios_[1]);
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waves_[2]->setFrequency(baseFrequency_ * temp * ratios_[2]);
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waves_[3]->setFrequency(baseFrequency_ * temp * ratios_[3]);
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}
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waves_[3]->addPhaseOffset( twozero_.lastOut() );
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temp = control1_ * 2.0 * gains_[3] * adsr_[3]->tick() * waves_[3]->tick();
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twozero_.tick(temp);
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temp += control2_ * 2.0 * gains_[2] * adsr_[2]->tick() * waves_[2]->tick();
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temp += gains_[1] * adsr_[1]->tick() * waves_[1]->tick();
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temp += gains_[0] * adsr_[0]->tick() * waves_[0]->tick();
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lastOutput_ = temp * 0.125;
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return lastOutput_;
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}
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