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# StifKarp.h

    00001 #ifndef STK_STIFKARP_H
    00002 #define STK_STIFKARP_H
    00003
    00004 #include "Instrmnt.h"
    00005 #include "DelayL.h"
    00006 #include "DelayA.h"
    00007 #include "OneZero.h"
    00008 #include "Noise.h"
    00009 #include "BiQuad.h"
    00010
    00011 namespace stk {
    00012
    00013 /***************************************************/
    00034 /***************************************************/
    00035
    00036 class StifKarp : public Instrmnt
    00037 {
    00038  public:
    00040   StifKarp( StkFloat lowestFrequency );
    00041
    00043   ~StifKarp( void );
    00044
    00046   void clear( void );
    00047
    00049   void setFrequency( StkFloat frequency );
    00050
    00052   void setStretch( StkFloat stretch );
    00053
    00055   void setPickupPosition( StkFloat position );
    00056
    00058
    00063   void setBaseLoopGain( StkFloat aGain );
    00064
    00066   void pluck( StkFloat amplitude );
    00067
    00069   void noteOn( StkFloat frequency, StkFloat amplitude );
    00070
    00072   void noteOff( StkFloat amplitude );
    00073
    00075   void controlChange( int number, StkFloat value );
    00076
    00078   StkFloat tick( unsigned int channel = 0 );
    00079
    00080  protected:
    00081
    00082   DelayA  delayLine_;
    00083   DelayL  combDelay_;
    00084   OneZero filter_;
    00085   Noise   noise_;
    00086   BiQuad  biquad_[4];
    00087
    00088   unsigned long length_;
    00089   StkFloat loopGain_;
    00090   StkFloat baseLoopGain_;
    00091   StkFloat lastFrequency_;
    00092   StkFloat lastLength_;
    00093   StkFloat stretching_;
    00094   StkFloat pluckAmplitude_;
    00095   StkFloat pickupPosition_;
    00096
    00097 };
    00098
    00099 inline StkFloat StifKarp :: tick( unsigned int )
    00100 {
    00101   StkFloat temp = delayLine_.lastOut() * loopGain_;
    00102
    00103   // Calculate allpass stretching.
    00104   for (int i=0; i<4; i++)
    00105     temp = biquad_[i].tick(temp);
    00106
    00107   // Moving average filter.
    00108   temp = filter_.tick(temp);
    00109
    00110   lastFrame_[0] = delayLine_.tick(temp);
    00111   lastFrame_[0] = lastFrame_[0] - combDelay_.tick( lastFrame_[0] );
    00112   return lastFrame_[0];
    00113 }
    00114
    00115 } // stk namespace
    00116
    00117 #endif

The Synthesis ToolKit in C++ (STK)
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