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PoleZero.h
1 #ifndef STK_POLEZERO_H
2 #define STK_POLEZERO_H
3 
4 #include "Filter.h"
5 
6 namespace stk {
7 
8 /***************************************************/
19 /***************************************************/
20 
21 class PoleZero : public Filter
22 {
23  public:
24 
26  PoleZero();
27 
29  ~PoleZero();
30 
32  void setB0( StkFloat b0 ) { b_[0] = b0; };
33 
35  void setB1( StkFloat b1 ) { b_[1] = b1; };
36 
38  void setA1( StkFloat a1 ) { a_[1] = a1; };
39 
41  void setCoefficients( StkFloat b0, StkFloat b1, StkFloat a1, bool clearState = false );
42 
44 
50  void setAllpass( StkFloat coefficient );
51 
53 
59  void setBlockZero( StkFloat thePole = 0.99 );
60 
62  StkFloat lastOut( void ) const { return lastFrame_[0]; };
63 
65  StkFloat tick( StkFloat input );
66 
68 
75  StkFrames& tick( StkFrames& frames, unsigned int channel = 0 );
76 
77 };
78 
79 inline StkFloat PoleZero :: tick( StkFloat input )
80 {
81  inputs_[0] = gain_ * input;
82  lastFrame_[0] = b_[0] * inputs_[0] + b_[1] * inputs_[1] - a_[1] * outputs_[1];
83  inputs_[1] = inputs_[0];
84  outputs_[1] = lastFrame_[0];
85 
86  return lastFrame_[0];
87 }
88 
89 inline StkFrames& PoleZero :: tick( StkFrames& frames, unsigned int channel )
90 {
91 #if defined(_STK_DEBUG_)
92  if ( channel >= frames.channels() ) {
93  oStream_ << "PoleZero::tick(): channel and StkFrames arguments are incompatible!";
94  handleError( StkError::FUNCTION_ARGUMENT );
95  }
96 #endif
97 
98  StkFloat *samples = &frames[channel];
99  unsigned int hop = frames.channels();
100  for ( unsigned int i=0; i<frames.frames(); i++, samples += hop ) {
101  inputs_[0] = gain_ * *samples;
102  *samples = b_[0] * inputs_[0] + b_[1] * inputs_[1] - a_[1] * outputs_[1];
103  inputs_[1] = inputs_[0];
104  outputs_[1] = *samples;
105  }
106 
107  lastFrame_[0] = outputs_[1];
108  return frames;
109 }
110 
111 } // stk namespace
112 
113 #endif

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