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STK singing FM synthesis instrument. More...
#include <FMVoices.h>
Public Member Functions | |
FMVoices (void) | |
Class constructor. | |
~FMVoices (void) | |
Class destructor. | |
void | setFrequency (StkFloat frequency) |
Set instrument parameters for a particular frequency. | |
void | noteOn (StkFloat frequency, StkFloat amplitude) |
Start a note with the given frequency and amplitude. | |
void | controlChange (int number, StkFloat value) |
Perform the control change specified by number and value (0.0 - 128.0). | |
StkFloat | tick (unsigned int channel=0) |
Compute and return one output sample. | |
StkFrames & | tick (StkFrames &frames, unsigned int channel=0) |
Fill a channel of the StkFrames object with computed outputs. |
STK singing FM synthesis instrument.
This class implements 3 carriers and a common modulator, also referred to as algorithm 6 of the TX81Z.
Algorithm 6 is : /->1 -\ 4-|-->2 - +-> Out \->3 -/
Control Change Numbers:
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, 1995-2011.
stk::FMVoices::FMVoices | ( | void | ) |
Class constructor.
An StkError will be thrown if the rawwave path is incorrectly set.
Fill a channel of the StkFrames object with computed outputs.
The channel
argument must be less than the number of channels in the StkFrames argument (the first channel is specified by 0). However, range checking is only performed if _STK_DEBUG_ is defined during compilation, in which case an out-of-range value will trigger an StkError exception.
Implements stk::FM.
00107 { 00108 unsigned int nChannels = lastFrame_.channels(); 00109 #if defined(_STK_DEBUG_) 00110 if ( channel > frames.channels() - nChannels ) { 00111 oStream_ << "FMVoices::tick(): channel and StkFrames arguments are incompatible!"; 00112 handleError( StkError::FUNCTION_ARGUMENT ); 00113 } 00114 #endif 00115 00116 StkFloat *samples = &frames[channel]; 00117 unsigned int j, hop = frames.channels() - nChannels; 00118 if ( nChannels == 1 ) { 00119 for ( unsigned int i=0; i<frames.frames(); i++, samples += hop ) 00120 *samples++ = tick(); 00121 } 00122 else { 00123 for ( unsigned int i=0; i<frames.frames(); i++, samples += hop ) { 00124 *samples++ = tick(); 00125 for ( j=1; j<nChannels; j++ ) 00126 *samples++ = lastFrame_[j]; 00127 } 00128 } 00129 00130 return frames; 00131 }
The Synthesis ToolKit in C++ (STK) |
©1995-2011 Perry R. Cook and Gary P. Scavone. All Rights Reserved. |