The Synthesis ToolKit in C++ (STK)

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Modal.h
1 #ifndef STK_MODAL_H
2 #define STK_MODAL_H
3
4 #include "Instrmnt.h"
5 #include "Envelope.h"
6 #include "FileLoop.h"
7 #include "SineWave.h"
8 #include "BiQuad.h"
9 #include "OnePole.h"
10
11 namespace stk {
12
13 /***************************************************/
24 /***************************************************/
25
26 class Modal : public Instrmnt
27 {
28 public:
30
33 Modal( unsigned int modes = 4 );
34
36 virtual ~Modal( void );
37
39 void clear( void );
40
42 virtual void setFrequency( StkFloat frequency );
43
45 void setRatioAndRadius( unsigned int modeIndex, StkFloat ratio, StkFloat radius );
46
48 void setMasterGain( StkFloat aGain ) { masterGain_ = aGain; };
49
51 void setDirectGain( StkFloat aGain ) { directGain_ = aGain; };
52
54 void setModeGain( unsigned int modeIndex, StkFloat gain );
55
57 virtual void strike( StkFloat amplitude );
58
60 void damp( StkFloat amplitude );
61
63 void noteOn( StkFloat frequency, StkFloat amplitude );
64
66 void noteOff( StkFloat amplitude );
67
69 virtual void controlChange( int number, StkFloat value ) = 0;
70
72 StkFloat tick( unsigned int channel = 0 );
73
75
82 StkFrames& tick( StkFrames& frames, unsigned int channel = 0 );
83
84 protected:
85
86 Envelope envelope_;
87 FileWvIn *wave_;
88 BiQuad **filters_;
89 OnePole onepole_;
90 SineWave vibrato_;
91
92 unsigned int nModes_;
93 std::vector<StkFloat> ratios_;
94 std::vector<StkFloat> radii_;
95
96 StkFloat vibratoGain_;
97 StkFloat masterGain_;
98 StkFloat directGain_;
99 StkFloat stickHardness_;
100 StkFloat strikePosition_;
101 StkFloat baseFrequency_;
102 };
103
104 inline StkFloat Modal :: tick( unsigned int )
105 {
106 StkFloat temp = masterGain_ * onepole_.tick( wave_->tick() * envelope_.tick() );
107
108 StkFloat temp2 = 0.0;
109 for ( unsigned int i=0; i<nModes_; i++ )
110 temp2 += filters_[i]->tick(temp);
111
112 temp2 -= temp2 * directGain_;
113 temp2 += directGain_ * temp;
114
115 if ( vibratoGain_ != 0.0 ) {
116 // Calculate AM and apply to master out
117 temp = 1.0 + ( vibrato_.tick() * vibratoGain_ );
118 temp2 = temp * temp2;
119 }
120
121 lastFrame_[0] = temp2;
122 return lastFrame_[0];
123 }
124
125 inline StkFrames& Modal :: tick( StkFrames& frames, unsigned int channel )
126 {
127 unsigned int nChannels = lastFrame_.channels();
128 #if defined(_STK_DEBUG_)
129 if ( channel > frames.channels() - nChannels ) {
130 oStream_ << "Modal::tick(): channel and StkFrames arguments are incompatible!";
131 handleError( StkError::FUNCTION_ARGUMENT );
132 }
133 #endif
134
135 StkFloat *samples = &frames[channel];
136 unsigned int j, hop = frames.channels() - nChannels;
137 if ( nChannels == 1 ) {
138 for ( unsigned int i=0; i<frames.frames(); i++, samples += hop )
139 *samples++ = tick();
140 }
141 else {
142 for ( unsigned int i=0; i<frames.frames(); i++, samples += hop ) {
143 *samples++ = tick();
144 for ( j=1; j<nChannels; j++ )
145 *samples++ = lastFrame_[j];
146 }
147 }
148
149 return frames;
150 }
151
152 } // stk namespace
153
154 #endif

The Synthesis ToolKit in C++ (STK)
©1995--2017 Perry R. Cook and Gary P. Scavone. All Rights Reserved.