mirror of
https://github.com/thestk/stk
synced 2026-01-12 12:31:53 +00:00
114 lines
3.1 KiB
C++
114 lines
3.1 KiB
C++
/***************************************************/
|
|
/*! \class Wurley
|
|
\brief STK Wurlitzer electric piano FM
|
|
synthesis instrument.
|
|
|
|
This class implements two simple FM Pairs
|
|
summed together, also referred to as algorithm
|
|
5 of the TX81Z.
|
|
|
|
\code
|
|
Algorithm 5 is : 4->3--\
|
|
+ --> Out
|
|
2->1--/
|
|
\endcode
|
|
|
|
Control Change Numbers:
|
|
- Modulator Index One = 2
|
|
- Crossfade of Outputs = 4
|
|
- LFO Speed = 11
|
|
- LFO Depth = 1
|
|
- ADSR 2 & 4 Target = 128
|
|
|
|
The basic Chowning/Stanford FM patent expired
|
|
in 1995, but there exist follow-on patents,
|
|
mostly assigned to Yamaha. If you are of the
|
|
type who should worry about this (making
|
|
money) worry away.
|
|
|
|
by Perry R. Cook and Gary P. Scavone, 1995 - 2007.
|
|
*/
|
|
/***************************************************/
|
|
|
|
#include "Wurley.h"
|
|
|
|
Wurley :: Wurley()
|
|
: FM()
|
|
{
|
|
// Concatenate the STK rawwave path to the rawwave files
|
|
for ( unsigned int i=0; i<3; i++ )
|
|
waves_[i] = new WaveLoop( (Stk::rawwavePath() + "sinewave.raw").c_str(), true );
|
|
waves_[3] = new WaveLoop( (Stk::rawwavePath() + "fwavblnk.raw").c_str(), true );
|
|
|
|
this->setRatio(0, 1.0);
|
|
this->setRatio(1, 4.0);
|
|
this->setRatio(2, -510.0);
|
|
this->setRatio(3, -510.0);
|
|
|
|
gains_[0] = fmGains_[99];
|
|
gains_[1] = fmGains_[82];
|
|
gains_[2] = fmGains_[92];
|
|
gains_[3] = fmGains_[68];
|
|
|
|
adsr_[0]->setAllTimes( 0.001, 1.50, 0.0, 0.04);
|
|
adsr_[1]->setAllTimes( 0.001, 1.50, 0.0, 0.04);
|
|
adsr_[2]->setAllTimes( 0.001, 0.25, 0.0, 0.04);
|
|
adsr_[3]->setAllTimes( 0.001, 0.15, 0.0, 0.04);
|
|
|
|
twozero_.setGain( 2.0 );
|
|
vibrato_.setFrequency( 8.0 );
|
|
}
|
|
|
|
Wurley :: ~Wurley()
|
|
{
|
|
}
|
|
|
|
void Wurley :: setFrequency(StkFloat frequency)
|
|
{
|
|
baseFrequency_ = frequency;
|
|
waves_[0]->setFrequency( baseFrequency_ * ratios_[0]);
|
|
waves_[1]->setFrequency( baseFrequency_ * ratios_[1]);
|
|
waves_[2]->setFrequency( ratios_[2] ); // Note here a 'fixed resonance'.
|
|
waves_[3]->setFrequency( ratios_[3] );
|
|
}
|
|
|
|
void Wurley :: noteOn(StkFloat frequency, StkFloat amplitude)
|
|
{
|
|
gains_[0] = amplitude * fmGains_[99];
|
|
gains_[1] = amplitude * fmGains_[82];
|
|
gains_[2] = amplitude * fmGains_[82];
|
|
gains_[3] = amplitude * fmGains_[68];
|
|
this->setFrequency( frequency );
|
|
this->keyOn();
|
|
|
|
#if defined(_STK_DEBUG_)
|
|
errorString_ << "Wurley::NoteOn: frequency = " << frequency << ", amplitude = " << amplitude << '.';
|
|
handleError( StkError::DEBUG_WARNING );
|
|
#endif
|
|
}
|
|
|
|
StkFloat Wurley :: computeSample()
|
|
{
|
|
StkFloat temp, temp2;
|
|
|
|
temp = gains_[1] * adsr_[1]->tick() * waves_[1]->tick();
|
|
temp = temp * control1_;
|
|
|
|
waves_[0]->addPhaseOffset( temp );
|
|
waves_[3]->addPhaseOffset( twozero_.lastOut() );
|
|
temp = gains_[3] * adsr_[3]->tick() * waves_[3]->tick();
|
|
twozero_.tick(temp);
|
|
|
|
waves_[2]->addPhaseOffset( temp );
|
|
temp = ( 1.0 - (control2_ * 0.5)) * gains_[0] * adsr_[0]->tick() * waves_[0]->tick();
|
|
temp += control2_ * 0.5 * gains_[2] * adsr_[2]->tick() * waves_[2]->tick();
|
|
|
|
// Calculate amplitude modulation and apply it to output.
|
|
temp2 = vibrato_.tick() * modDepth_;
|
|
temp = temp * (1.0 + temp2);
|
|
|
|
lastOutput_ = temp * 0.5;
|
|
return lastOutput_;
|
|
}
|
|
|