mirror of
https://github.com/thestk/stk
synced 2026-01-11 12:01:52 +00:00
99 lines
2.6 KiB
C++
99 lines
2.6 KiB
C++
#ifndef STK_FMVOICES_H
|
|
#define STK_FMVOICES_H
|
|
|
|
#include "FM.h"
|
|
|
|
namespace stk {
|
|
|
|
/***************************************************/
|
|
/*! \class FMVoices
|
|
\brief STK singing FM synthesis instrument.
|
|
|
|
This class implements 3 carriers and a common
|
|
modulator, also referred to as algorithm 6 of
|
|
the TX81Z.
|
|
|
|
\code
|
|
Algorithm 6 is :
|
|
/->1 -\
|
|
4-|-->2 - +-> Out
|
|
\->3 -/
|
|
\endcode
|
|
|
|
Control Change Numbers:
|
|
- Vowel = 2
|
|
- Spectral Tilt = 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 - 2009.
|
|
*/
|
|
/***************************************************/
|
|
|
|
class FMVoices : public FM
|
|
{
|
|
public:
|
|
//! Class constructor.
|
|
/*!
|
|
An StkError will be thrown if the rawwave path is incorrectly set.
|
|
*/
|
|
FMVoices( void );
|
|
|
|
//! Class destructor.
|
|
~FMVoices( void );
|
|
|
|
//! Set instrument parameters for a particular frequency.
|
|
void setFrequency( StkFloat frequency );
|
|
|
|
//! Start a note with the given frequency and amplitude.
|
|
void noteOn( StkFloat frequency, StkFloat amplitude );
|
|
|
|
//! Perform the control change specified by \e number and \e value (0.0 - 128.0).
|
|
void controlChange( int number, StkFloat value );
|
|
|
|
//! Compute and return one output sample.
|
|
StkFloat tick( unsigned int channel = 0 );
|
|
|
|
protected:
|
|
|
|
int currentVowel_;
|
|
StkFloat tilt_[3];
|
|
StkFloat mods_[3];
|
|
};
|
|
|
|
inline StkFloat FMVoices :: tick( unsigned int )
|
|
{
|
|
register StkFloat temp, temp2;
|
|
|
|
temp = gains_[3] * adsr_[3]->tick() * waves_[3]->tick();
|
|
temp2 = vibrato_.tick() * modDepth_ * 0.1;
|
|
|
|
waves_[0]->setFrequency(baseFrequency_ * (1.0 + temp2) * ratios_[0]);
|
|
waves_[1]->setFrequency(baseFrequency_ * (1.0 + temp2) * ratios_[1]);
|
|
waves_[2]->setFrequency(baseFrequency_ * (1.0 + temp2) * ratios_[2]);
|
|
waves_[3]->setFrequency(baseFrequency_ * (1.0 + temp2) * ratios_[3]);
|
|
|
|
waves_[0]->addPhaseOffset(temp * mods_[0]);
|
|
waves_[1]->addPhaseOffset(temp * mods_[1]);
|
|
waves_[2]->addPhaseOffset(temp * mods_[2]);
|
|
waves_[3]->addPhaseOffset( twozero_.lastOut() );
|
|
twozero_.tick( temp );
|
|
temp = gains_[0] * tilt_[0] * adsr_[0]->tick() * waves_[0]->tick();
|
|
temp += gains_[1] * tilt_[1] * adsr_[1]->tick() * waves_[1]->tick();
|
|
temp += gains_[2] * tilt_[2] * adsr_[2]->tick() * waves_[2]->tick();
|
|
|
|
lastFrame_[0] = temp * 0.33;
|
|
return lastFrame_[0];
|
|
}
|
|
|
|
} // stk namespace
|
|
|
|
#endif
|