Home Information Classes Download Usage Mail List Requirements Links FAQ Tutorial

# 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
    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

The Synthesis ToolKit in C++ (STK)
©1995-2010 Perry R. Cook and Gary P. Scavone. All Rights Reserved.