Home   Information   Classes   Download   Usage   Mail List   Requirements   Links   FAQ   Tutorial


Sitar.h
1 #ifndef STK_SITAR_H
2 #define STK_SITAR_H
3 
4 #include "Instrmnt.h"
5 #include "DelayA.h"
6 #include "OneZero.h"
7 #include "Noise.h"
8 #include "ADSR.h"
9 #include <cmath>
10 
11 namespace stk {
12 
13 /***************************************************/
30 /***************************************************/
31 
32 class Sitar : public Instrmnt
33 {
34  public:
36  Sitar( StkFloat lowestFrequency = 8.0 );
37 
39  ~Sitar( void );
40 
42  void clear( void );
43 
45  void setFrequency( StkFloat frequency );
46 
48  void pluck( StkFloat amplitude );
49 
51  void noteOn( StkFloat frequency, StkFloat amplitude );
52 
54  void noteOff( StkFloat amplitude );
55 
57  StkFloat tick( unsigned int channel = 0 );
58 
60 
67  StkFrames& tick( StkFrames& frames, unsigned int channel = 0 );
68 
69  protected:
70 
71  DelayA delayLine_;
72  OneZero loopFilter_;
73  Noise noise_;
74  ADSR envelope_;
75 
76  StkFloat loopGain_;
77  StkFloat amGain_;
78  StkFloat delay_;
79  StkFloat targetDelay_;
80 
81 };
82 
83 inline StkFloat Sitar :: tick( unsigned int )
84 {
85  if ( fabs(targetDelay_ - delay_) > 0.001 ) {
86  if ( targetDelay_ < delay_ )
87  delay_ *= 0.99999;
88  else
89  delay_ *= 1.00001;
90  delayLine_.setDelay( delay_ );
91  }
92 
93  lastFrame_[0] = delayLine_.tick( loopFilter_.tick( delayLine_.lastOut() * loopGain_ ) +
94  (amGain_ * envelope_.tick() * noise_.tick()));
95 
96  return lastFrame_[0];
97 }
98 
99 inline StkFrames& Sitar :: tick( StkFrames& frames, unsigned int channel )
100 {
101  unsigned int nChannels = lastFrame_.channels();
102 #if defined(_STK_DEBUG_)
103  if ( channel > frames.channels() - nChannels ) {
104  oStream_ << "Sitar::tick(): channel and StkFrames arguments are incompatible!";
105  handleError( StkError::FUNCTION_ARGUMENT );
106  }
107 #endif
108 
109  StkFloat *samples = &frames[channel];
110  unsigned int j, hop = frames.channels() - nChannels;
111  if ( nChannels == 1 ) {
112  for ( unsigned int i=0; i<frames.frames(); i++, samples += hop )
113  *samples++ = tick();
114  }
115  else {
116  for ( unsigned int i=0; i<frames.frames(); i++, samples += hop ) {
117  *samples++ = tick();
118  for ( j=1; j<nChannels; j++ )
119  *samples++ = lastFrame_[j];
120  }
121  }
122 
123  return frames;
124 }
125 
126 } // stk namespace
127 
128 #endif
129 

The Synthesis ToolKit in C++ (STK)
©1995--2014 Perry R. Cook and Gary P. Scavone. All Rights Reserved.