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00001 #ifndef STK_ONEPOLE_H 00002 #define STK_ONEPOLE_H 00003 00004 #include "Filter.h" 00005 00006 namespace stk { 00007 00008 /***************************************************/ 00018 /***************************************************/ 00019 00020 class OnePole : public Filter 00021 { 00022 public: 00023 00025 OnePole( StkFloat thePole = 0.9 ); 00026 00028 ~OnePole(); 00029 00031 void setB0( StkFloat b0 ) { b_[0] = b0; }; 00032 00034 void setA1( StkFloat a1 ) { a_[1] = a1; }; 00035 00037 void setCoefficients( StkFloat b0, StkFloat a1, bool clearState = false ); 00038 00040 00048 void setPole( StkFloat thePole ); 00049 00051 StkFloat lastOut( void ) const { return lastFrame_[0]; }; 00052 00054 StkFloat tick( StkFloat input ); 00055 00057 00065 StkFrames& tick( StkFrames& frames, unsigned int channel = 0 ); 00066 00068 00076 StkFrames& tick( StkFrames& iFrames, StkFrames &oFrames, unsigned int iChannel = 0, unsigned int oChannel = 0 ); 00077 00078 }; 00079 00080 inline StkFloat OnePole :: tick( StkFloat input ) 00081 { 00082 inputs_[0] = gain_ * input; 00083 lastFrame_[0] = b_[0] * inputs_[0] - a_[1] * outputs_[1]; 00084 outputs_[1] = lastFrame_[0]; 00085 00086 return lastFrame_[0]; 00087 } 00088 00089 inline StkFrames& OnePole :: tick( StkFrames& frames, unsigned int channel ) 00090 { 00091 #if defined(_STK_DEBUG_) 00092 if ( channel >= frames.channels() ) { 00093 oStream_ << "OnePole::tick(): channel and StkFrames arguments are incompatible!"; 00094 handleError( StkError::FUNCTION_ARGUMENT ); 00095 } 00096 #endif 00097 00098 StkFloat *samples = &frames[channel]; 00099 unsigned int hop = frames.channels(); 00100 for ( unsigned int i=0; i<frames.frames(); i++, samples += hop ) { 00101 inputs_[0] = gain_ * *samples; 00102 *samples = b_[0] * inputs_[0] - a_[1] * outputs_[1]; 00103 outputs_[1] = *samples; 00104 } 00105 00106 lastFrame_[0] = outputs_[1]; 00107 return frames; 00108 } 00109 00110 inline StkFrames& OnePole :: tick( StkFrames& iFrames, StkFrames& oFrames, unsigned int iChannel, unsigned int oChannel ) 00111 { 00112 #if defined(_STK_DEBUG_) 00113 if ( iChannel >= iFrames.channels() || oChannel >= oFrames.channels() ) { 00114 oStream_ << "OnePole::tick(): channel and StkFrames arguments are incompatible!"; 00115 handleError( StkError::FUNCTION_ARGUMENT ); 00116 } 00117 #endif 00118 00119 StkFloat *iSamples = &iFrames[iChannel]; 00120 StkFloat *oSamples = &oFrames[oChannel]; 00121 unsigned int iHop = iFrames.channels(), oHop = oFrames.channels(); 00122 for ( unsigned int i=0; i<iFrames.frames(); i++, iSamples += iHop, oSamples += oHop ) { 00123 inputs_[0] = gain_ * *iSamples; 00124 *oSamples = b_[0] * inputs_[0] - a_[1] * outputs_[1]; 00125 outputs_[1] = *oSamples; 00126 } 00127 00128 lastFrame_[0] = outputs_[1]; 00129 return iFrames; 00130 } 00131 00132 } // stk namespace 00133 00134 #endif
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