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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 = 8.0 );
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  unsigned long length_;
99  StkFloat loopGain_;
100  StkFloat baseLoopGain_;
101  StkFloat lastFrequency_;
102  StkFloat lastLength_;
103  StkFloat stretching_;
104  StkFloat pluckAmplitude_;
105  StkFloat pickupPosition_;
106 
107 };
108 
109 inline StkFloat StifKarp :: tick( unsigned int )
110 {
111  StkFloat temp = delayLine_.lastOut() * loopGain_;
112 
113  // Calculate allpass stretching.
114  for (int i=0; i<4; i++)
115  temp = biquad_[i].tick(temp);
116 
117  // Moving average filter.
118  temp = filter_.tick(temp);
119 
120  lastFrame_[0] = delayLine_.tick(temp);
121  lastFrame_[0] = lastFrame_[0] - combDelay_.tick( lastFrame_[0] );
122  return lastFrame_[0];
123 }
124 
125 inline StkFrames& StifKarp :: 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_ << "StifKarp::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

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