The Synthesis ToolKit in C++ (STK)

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Brass.h
1 #ifndef STK_BRASS_H
2 #define STK_BRASS_H
3
4 #include "Instrmnt.h"
5 #include "DelayA.h"
6 #include "BiQuad.h"
7 #include "PoleZero.h"
8 #include "ADSR.h"
9 #include "SineWave.h"
10
11 namespace stk {
12
13 /***************************************************/
33 /***************************************************/
34
35 class Brass: public Instrmnt
36 {
37 public:
39
42 Brass( StkFloat lowestFrequency = 8.0 );
43
45 ~Brass( );
46
48 void clear( );
49
51 void setFrequency( StkFloat frequency );
52
54 void setLip( StkFloat frequency );
55
57 void startBlowing( StkFloat amplitude, StkFloat rate );
58
60 void stopBlowing( StkFloat rate );
61
63 void noteOn( StkFloat frequency, StkFloat amplitude );
64
66 void noteOff( StkFloat amplitude );
67
69 void controlChange( int number, StkFloat value );
70
72 StkFloat tick( unsigned int channel = 0 );
73
75
82 StkFrames& tick( StkFrames& frames, unsigned int channel = 0 );
83
84 protected:
85
86 DelayA delayLine_;
87 BiQuad lipFilter_;
88 PoleZero dcBlock_;
89 ADSR adsr_;
90 SineWave vibrato_;
91
92 StkFloat lipTarget_;
93 StkFloat slideTarget_;
94 StkFloat vibratoGain_;
95 StkFloat maxPressure_;
96
97 };
98
99 inline StkFloat Brass :: tick( unsigned int )
100 {
101 StkFloat breathPressure = maxPressure_ * adsr_.tick();
102 breathPressure += vibratoGain_ * vibrato_.tick();
103
104 StkFloat mouthPressure = 0.3 * breathPressure;
105 StkFloat borePressure = 0.85 * delayLine_.lastOut();
106 StkFloat deltaPressure = mouthPressure - borePressure; // Differential pressure.
107 deltaPressure = lipFilter_.tick( deltaPressure ); // Force - > position.
108 deltaPressure *= deltaPressure; // Basic position to area mapping.
109 if ( deltaPressure > 1.0 ) deltaPressure = 1.0; // Non-linear saturation.
110
111 // The following input scattering assumes the mouthPressure = area.
112 lastFrame_[0] = deltaPressure * mouthPressure + ( 1.0 - deltaPressure) * borePressure;
113 lastFrame_[0] = delayLine_.tick( dcBlock_.tick( lastFrame_[0] ) );
114
115 return lastFrame_[0];
116 }
117
118 inline StkFrames& Brass :: tick( StkFrames& frames, unsigned int channel )
119 {
120 unsigned int nChannels = lastFrame_.channels();
121 #if defined(_STK_DEBUG_)
122 if ( channel > frames.channels() - nChannels ) {
123 oStream_ << "Brass::tick(): channel and StkFrames arguments are incompatible!";
124 handleError( StkError::FUNCTION_ARGUMENT );
125 }
126 #endif
127
128 StkFloat *samples = &frames[channel];
129 unsigned int j, hop = frames.channels() - nChannels;
130 if ( nChannels == 1 ) {
131 for ( unsigned int i=0; i<frames.frames(); i++, samples += hop )
132 *samples++ = tick();
133 }
134 else {
135 for ( unsigned int i=0; i<frames.frames(); i++, samples += hop ) {
136 *samples++ = tick();
137 for ( j=1; j<nChannels; j++ )
138 *samples++ = lastFrame_[j];
139 }
140 }
141
142 return frames;
143 }
144
145 } // stk namespace
146
147 #endif

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