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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)
©1995-2012 Perry R. Cook and Gary P. Scavone. All Rights Reserved.