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BlowHole.h

00001 #ifndef STK_BLOWHOLE_H
00002 #define STK_BLOWHOLE_H
00003 
00004 #include "Instrmnt.h"
00005 #include "DelayL.h"
00006 #include "ReedTable.h"
00007 #include "OneZero.h"
00008 #include "PoleZero.h"
00009 #include "Envelope.h"
00010 #include "Noise.h"
00011 #include "SineWave.h"
00012 
00013 namespace stk {
00014 
00015 /***************************************************/
00048 /***************************************************/
00049 
00050 class BlowHole : public Instrmnt
00051 {
00052  public:
00054 
00057   BlowHole( StkFloat lowestFrequency );
00058 
00060   ~BlowHole( void );
00061 
00063   void clear( void );
00064 
00066   void setFrequency( StkFloat frequency );
00067 
00069   void setTonehole( StkFloat newValue );
00070 
00072   void setVent( StkFloat newValue );
00073 
00075   void startBlowing( StkFloat amplitude, StkFloat rate );
00076 
00078   void stopBlowing( StkFloat rate );
00079 
00081   void noteOn( StkFloat frequency, StkFloat amplitude );
00082 
00084   void noteOff( StkFloat amplitude );
00085 
00087   void controlChange( int number, StkFloat value );
00088 
00090   StkFloat tick( unsigned int channel = 0 );
00091 
00092  protected:
00093 
00094   DelayL    delays_[3];
00095   ReedTable reedTable_;
00096   OneZero   filter_;
00097   PoleZero  tonehole_;
00098   PoleZero  vent_;
00099   Envelope  envelope_;
00100   Noise     noise_;
00101   SineWave vibrato_;
00102   unsigned long length_;
00103   StkFloat scatter_;
00104   StkFloat thCoeff_;
00105   StkFloat rhGain_;
00106   StkFloat outputGain_;
00107   StkFloat noiseGain_;
00108   StkFloat vibratoGain_;
00109 
00110 };
00111 
00112   inline StkFloat BlowHole :: tick( unsigned int )
00113 {
00114   StkFloat pressureDiff;
00115   StkFloat breathPressure;
00116   StkFloat temp;
00117 
00118   // Calculate the breath pressure (envelope + noise + vibrato)
00119   breathPressure = envelope_.tick(); 
00120   breathPressure += breathPressure * noiseGain_ * noise_.tick();
00121   breathPressure += breathPressure * vibratoGain_ * vibrato_.tick();
00122 
00123   // Calculate the differential pressure = reflected - mouthpiece pressures
00124   pressureDiff = delays_[0].lastOut() - breathPressure;
00125 
00126   // Do two-port junction scattering for register vent
00127   StkFloat pa = breathPressure + pressureDiff * reedTable_.tick( pressureDiff );
00128   StkFloat pb = delays_[1].lastOut();
00129   vent_.tick( pa+pb );
00130 
00131   lastFrame_[0] = delays_[0].tick( vent_.lastOut()+pb );
00132   lastFrame_[0] *= outputGain_;
00133 
00134   // Do three-port junction scattering (under tonehole)
00135   pa += vent_.lastOut();
00136   pb = delays_[2].lastOut();
00137   StkFloat pth = tonehole_.lastOut();
00138   temp = scatter_ * (pa + pb - 2 * pth);
00139 
00140   delays_[2].tick( filter_.tick(pa + temp) * -0.95 );
00141   delays_[1].tick( pb + temp );
00142   tonehole_.tick( pa + pb - pth + temp );
00143 
00144   return lastFrame_[0];
00145 }
00146 
00147 } // stk namespace
00148 
00149 #endif

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