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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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