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# TwoPole.h

    00001 #ifndef STK_TWOPOLE_H
    00002 #define STK_TWOPOLE_H
    00003
    00004 #include "Filter.h"
    00005
    00006 namespace stk {
    00007
    00008 /***************************************************/
    00018 /***************************************************/
    00019
    00020 class TwoPole : public Filter
    00021 {
    00022  public:
    00023
    00025   TwoPole( void );
    00026
    00028   ~TwoPole();
    00029
    00031   void ignoreSampleRateChange( bool ignore = true ) { ignoreSampleRateChange_ = ignore; };
    00032
    00034   void setB0( StkFloat b0 ) { b_[0] = b0; };
    00035
    00037   void setA1( StkFloat a1 ) { a_[1] = a1; };
    00038
    00040   void setA2( StkFloat a2 ) { a_[2] = a2; };
    00041
    00043   void setCoefficients( StkFloat b0, StkFloat a1, StkFloat a2, bool clearState = false );
    00044
    00046
    00059   void setResonance(StkFloat frequency, StkFloat radius, bool normalize = false);
    00060
    00062   StkFloat lastOut( void ) const { return lastFrame_[0]; };
    00063
    00065   StkFloat tick( StkFloat input );
    00066
    00068
    00076   StkFrames& tick( StkFrames& frames, unsigned int channel = 0 );
    00077
    00079
    00087   StkFrames& tick( StkFrames& iFrames, StkFrames &oFrames, unsigned int iChannel = 0, unsigned int oChannel = 0 );
    00088
    00089  protected:
    00090
    00091   virtual void sampleRateChanged( StkFloat newRate, StkFloat oldRate );
    00092 };
    00093
    00094 inline StkFloat TwoPole :: tick( StkFloat input )
    00095 {
    00096   inputs_[0] = gain_ * input;
    00097   lastFrame_[0] = b_[0] * inputs_[0] - a_[1] * outputs_[1] - a_[2] * outputs_[2];
    00098   outputs_[2] = outputs_[1];
    00099   outputs_[1] = lastFrame_[0];
    00100
    00101   return lastFrame_[0];
    00102 }
    00103
    00104 inline StkFrames& TwoPole :: tick( StkFrames& frames, unsigned int channel )
    00105 {
    00106 #if defined(_STK_DEBUG_)
    00107   if ( channel >= frames.channels() ) {
    00108     errorString_ << "TwoPole::tick(): channel and StkFrames arguments are incompatible!";
    00109     handleError( StkError::FUNCTION_ARGUMENT );
    00110   }
    00111 #endif
    00112
    00113   StkFloat *samples = &frames[channel];
    00114   unsigned int hop = frames.channels();
    00115   for ( unsigned int i=0; i<frames.frames(); i++, samples += hop ) {
    00116     inputs_[0] = gain_ * *samples;
    00117     *samples = b_[0] * inputs_[0] - a_[1] * outputs_[1] - a_[2] * outputs_[2];
    00118     outputs_[2] = outputs_[1];
    00119     outputs_[1] = *samples;
    00120   }
    00121
    00122   lastFrame_[0] = outputs_[1];
    00123   return frames;
    00124 }
    00125
    00126 inline StkFrames& TwoPole :: tick( StkFrames& iFrames, StkFrames& oFrames, unsigned int iChannel, unsigned int oChannel )
    00127 {
    00128 #if defined(_STK_DEBUG_)
    00129   if ( iChannel >= iFrames.channels() || oChannel >= oFrames.channels() ) {
    00130     errorString_ << "TwoPole::tick(): channel and StkFrames arguments are incompatible!";
    00131     handleError( StkError::FUNCTION_ARGUMENT );
    00132   }
    00133 #endif
    00134
    00135   StkFloat *iSamples = &iFrames[iChannel];
    00136   StkFloat *oSamples = &oFrames[oChannel];
    00137   unsigned int iHop = iFrames.channels(), oHop = oFrames.channels();
    00138   for ( unsigned int i=0; i<iFrames.frames(); i++, iSamples += iHop, oSamples += oHop ) {
    00139     inputs_[0] = gain_ * *iSamples;
    00140     *oSamples = b_[0] * inputs_[0] - a_[1] * outputs_[1] - a_[2] * outputs_[2];
    00141     outputs_[2] = outputs_[1];
    00142     outputs_[1] = *oSamples;
    00143   }
    00144
    00145   lastFrame_[0] = outputs_[1];
    00146   return iFrames;
    00147 }
    00148
    00149 } // stk namespace
    00150
    00151 #endif

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