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# PoleZero.h

    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
    00050   void setAllpass( StkFloat coefficient );
    00051
    00053
    00059   void setBlockZero( StkFloat thePole = 0.99 );
    00060
    00062   StkFloat lastOut( void ) const { return lastFrame_[0]; };
    00063
    00065   StkFloat tick( StkFloat input );
    00066
    00068
    00075   StkFrames& tick( StkFrames& frames, unsigned int channel = 0 );
    00076
    00077 };
    00078
    00079 inline StkFloat PoleZero :: tick( StkFloat input )
    00080 {
    00081   inputs_[0] = gain_ * input;
    00082   lastFrame_[0] = b_[0] * inputs_[0] + b_[1] * inputs_[1] - a_[1] * outputs_[1];
    00083   inputs_[1] = inputs_[0];
    00084   outputs_[1] = lastFrame_[0];
    00085
    00086   return lastFrame_[0];
    00087 }
    00088
    00089 inline StkFrames& PoleZero :: tick( StkFrames& frames, unsigned int channel )
    00090 {
    00091 #if defined(_STK_DEBUG_)
    00092   if ( channel >= frames.channels() ) {
    00093     oStream_ << "PoleZero::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] + b_[1] * inputs_[1] - a_[1] * outputs_[1];
    00103     inputs_[1] = inputs_[0];
    00104     outputs_[1] = *samples;
    00105   }
    00106
    00107   lastFrame_[0] = outputs_[1];
    00108   return frames;
    00109 }
    00110
    00111 } // stk namespace
    00112
    00113 #endif

The Synthesis ToolKit in C++ (STK)
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