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00001 #ifndef STK_POLEZERO_H 00002 #define STK_POLEZERO_H 00003 00004 #include "Filter.h" 00005 00006 namespace stk { 00007 00008 /***************************************************/ 00019 /***************************************************/ 00020 00021 class PoleZero : public Filter 00022 { 00023 public: 00024 00026 PoleZero(); 00027 00029 ~PoleZero(); 00030 00032 void setB0( StkFloat b0 ) { b_[0] = b0; }; 00033 00035 void setB1( StkFloat b1 ) { b_[1] = b1; }; 00036 00038 void setA1( StkFloat a1 ) { a_[1] = a1; }; 00039 00041 void setCoefficients( StkFloat b0, StkFloat b1, StkFloat a1, bool clearState = false ); 00042 00044 00049 void setAllpass( StkFloat coefficient ); 00050 00052 00058 void setBlockZero( StkFloat thePole = 0.99 ); 00059 00061 StkFloat lastOut( void ) const { return lastFrame_[0]; }; 00062 00064 StkFloat tick( StkFloat input ); 00065 00067 00074 StkFrames& tick( StkFrames& frames, unsigned int channel = 0 ); 00075 00076 }; 00077 00078 inline StkFloat PoleZero :: tick( StkFloat input ) 00079 { 00080 inputs_[0] = gain_ * input; 00081 lastFrame_[0] = b_[0] * inputs_[0] + b_[1] * inputs_[1] - a_[1] * outputs_[1]; 00082 inputs_[1] = inputs_[0]; 00083 outputs_[1] = lastFrame_[0]; 00084 00085 return lastFrame_[0]; 00086 } 00087 00088 inline StkFrames& PoleZero :: tick( StkFrames& frames, unsigned int channel ) 00089 { 00090 #if defined(_STK_DEBUG_) 00091 if ( channel >= frames.channels() ) { 00092 errorString_ << "PoleZero::tick(): channel and StkFrames arguments are incompatible!"; 00093 handleError( StkError::FUNCTION_ARGUMENT ); 00094 } 00095 #endif 00096 00097 StkFloat *samples = &frames[channel]; 00098 unsigned int hop = frames.channels(); 00099 for ( unsigned int i=0; i<frames.frames(); i++, samples += hop ) { 00100 inputs_[0] = gain_ * *samples; 00101 *samples = b_[0] * inputs_[0] + b_[1] * inputs_[1] - a_[1] * outputs_[1]; 00102 inputs_[1] = inputs_[0]; 00103 outputs_[1] = *samples; 00104 } 00105 00106 lastFrame_[0] = outputs_[1]; 00107 return frames; 00108 } 00109 00110 } // stk namespace 00111 00112 #endif
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