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Clarinet.h

00001 #ifndef STK_CLARINET_H
00002 #define STK_CLARINET_H
00003 
00004 #include "Instrmnt.h"
00005 #include "DelayL.h"
00006 #include "ReedTable.h"
00007 #include "OneZero.h"
00008 #include "Envelope.h"
00009 #include "Noise.h"
00010 #include "SineWave.h"
00011 
00012 namespace stk {
00013 
00014 /***************************************************/
00036 /***************************************************/
00037 
00038 class Clarinet : public Instrmnt
00039 {
00040  public:
00042 
00045   Clarinet( StkFloat lowestFrequency );
00046 
00048   ~Clarinet( void );
00049 
00051   void clear( void );
00052 
00054   void setFrequency( StkFloat frequency );
00055 
00057   void startBlowing( StkFloat amplitude, StkFloat rate );
00058 
00060   void stopBlowing( StkFloat rate );
00061 
00063   void noteOn( StkFloat frequency, StkFloat amplitude );
00064 
00066   void noteOff( StkFloat amplitude );
00067 
00069   void controlChange( int number, StkFloat value );
00070 
00072   StkFloat tick( unsigned int channel = 0 );
00073 
00074  protected:
00075 
00076   DelayL delayLine_;
00077   ReedTable reedTable_;
00078   OneZero filter_;
00079   Envelope envelope_;
00080   Noise noise_;
00081   SineWave vibrato_;
00082   long length_;
00083   StkFloat outputGain_;
00084   StkFloat noiseGain_;
00085   StkFloat vibratoGain_;
00086 
00087 };
00088 
00089 inline StkFloat Clarinet :: tick( unsigned int )
00090 {
00091   StkFloat pressureDiff;
00092   StkFloat breathPressure;
00093 
00094   // Calculate the breath pressure (envelope + noise + vibrato)
00095   breathPressure = envelope_.tick(); 
00096   breathPressure += breathPressure * noiseGain_ * noise_.tick();
00097   breathPressure += breathPressure * vibratoGain_ * vibrato_.tick();
00098 
00099   // Perform commuted loss filtering.
00100   pressureDiff = -0.95 * filter_.tick( delayLine_.lastOut() );
00101 
00102   // Calculate pressure difference of reflected and mouthpiece pressures.
00103   pressureDiff = pressureDiff - breathPressure;
00104 
00105   // Perform non-linear scattering using pressure difference in reed function.
00106   lastFrame_[0] = delayLine_.tick(breathPressure + pressureDiff * reedTable_.tick(pressureDiff));
00107 
00108   // Apply output gain.
00109   lastFrame_[0] *= outputGain_;
00110 
00111   return lastFrame_[0];
00112 }
00113 
00114 } // stk namespace
00115 
00116 #endif

The Synthesis ToolKit in C++ (STK)
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