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StifKarp.h
1 #ifndef STK_STIFKARP_H
2 #define STK_STIFKARP_H
3 
4 #include "Instrmnt.h"
5 #include "DelayL.h"
6 #include "DelayA.h"
7 #include "OneZero.h"
8 #include "Noise.h"
9 #include "BiQuad.h"
10 
11 namespace stk {
12 
13 /***************************************************/
34 /***************************************************/
35 
36 class StifKarp : public Instrmnt
37 {
38  public:
40  StifKarp( StkFloat lowestFrequency = 10.0 );
41 
43  ~StifKarp( void );
44 
46  void clear( void );
47 
49  void setFrequency( StkFloat frequency );
50 
52  void setStretch( StkFloat stretch );
53 
55  void setPickupPosition( StkFloat position );
56 
58 
63  void setBaseLoopGain( StkFloat aGain );
64 
66  void pluck( StkFloat amplitude );
67 
69  void noteOn( StkFloat frequency, StkFloat amplitude );
70 
72  void noteOff( StkFloat amplitude );
73 
75  void controlChange( int number, StkFloat value );
76 
78  StkFloat tick( unsigned int channel = 0 );
79 
81 
88  StkFrames& tick( StkFrames& frames, unsigned int channel = 0 );
89 
90  protected:
91 
92  DelayA delayLine_;
93  DelayL combDelay_;
94  OneZero filter_;
95  Noise noise_;
96  BiQuad biquad_[4];
97 
98  StkFloat loopGain_;
99  StkFloat baseLoopGain_;
100  StkFloat lastFrequency_;
101  StkFloat lastLength_;
102  StkFloat stretching_;
103  StkFloat pluckAmplitude_;
104  StkFloat pickupPosition_;
105 
106 };
107 
108 inline StkFloat StifKarp :: tick( unsigned int )
109 {
110  StkFloat temp = delayLine_.lastOut() * loopGain_;
111 
112  // Calculate allpass stretching.
113  for (int i=0; i<4; i++)
114  temp = biquad_[i].tick(temp);
115 
116  // Moving average filter.
117  temp = filter_.tick(temp);
118 
119  lastFrame_[0] = delayLine_.tick(temp);
120  lastFrame_[0] = lastFrame_[0] - combDelay_.tick( lastFrame_[0] );
121  return lastFrame_[0];
122 }
123 
124 inline StkFrames& StifKarp :: tick( StkFrames& frames, unsigned int channel )
125 {
126  unsigned int nChannels = lastFrame_.channels();
127 #if defined(_STK_DEBUG_)
128  if ( channel > frames.channels() - nChannels ) {
129  oStream_ << "StifKarp::tick(): channel and StkFrames arguments are incompatible!";
130  handleError( StkError::FUNCTION_ARGUMENT );
131  }
132 #endif
133 
134  StkFloat *samples = &frames[channel];
135  unsigned int j, hop = frames.channels() - nChannels;
136  if ( nChannels == 1 ) {
137  for ( unsigned int i=0; i<frames.frames(); i++, samples += hop )
138  *samples++ = tick();
139  }
140  else {
141  for ( unsigned int i=0; i<frames.frames(); i++, samples += hop ) {
142  *samples++ = tick();
143  for ( j=1; j<nChannels; j++ )
144  *samples++ = lastFrame_[j];
145  }
146  }
147 
148  return frames;
149 }
150 
151 } // stk namespace
152 
153 #endif

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