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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
    00093
    00100   StkFrames& tick( StkFrames& frames, unsigned int channel = 0 );
    00101
    00102  protected:
    00103
    00104   DelayL    delays_[3];
    00105   ReedTable reedTable_;
    00106   OneZero   filter_;
    00107   PoleZero  tonehole_;
    00108   PoleZero  vent_;
    00109   Envelope  envelope_;
    00110   Noise     noise_;
    00111   SineWave  vibrato_;
    00112
    00113   StkFloat scatter_;
    00114   StkFloat thCoeff_;
    00115   StkFloat rhGain_;
    00116   StkFloat outputGain_;
    00117   StkFloat noiseGain_;
    00118   StkFloat vibratoGain_;
    00119 };
    00120
    00121   inline StkFloat BlowHole :: tick( unsigned int )
    00122 {
    00123   StkFloat pressureDiff;
    00124   StkFloat breathPressure;
    00125   StkFloat temp;
    00126
    00127   // Calculate the breath pressure (envelope + noise + vibrato)
    00128   breathPressure = envelope_.tick();
    00129   breathPressure += breathPressure * noiseGain_ * noise_.tick();
    00130   breathPressure += breathPressure * vibratoGain_ * vibrato_.tick();
    00131
    00132   // Calculate the differential pressure = reflected - mouthpiece pressures
    00133   pressureDiff = delays_[0].lastOut() - breathPressure;
    00134
    00135   // Do two-port junction scattering for register vent
    00136   StkFloat pa = breathPressure + pressureDiff * reedTable_.tick( pressureDiff );
    00137   StkFloat pb = delays_[1].lastOut();
    00138   vent_.tick( pa+pb );
    00139
    00140   lastFrame_[0] = delays_[0].tick( vent_.lastOut()+pb );
    00141   lastFrame_[0] *= outputGain_;
    00142
    00143   // Do three-port junction scattering (under tonehole)
    00144   pa += vent_.lastOut();
    00145   pb = delays_[2].lastOut();
    00146   StkFloat pth = tonehole_.lastOut();
    00147   temp = scatter_ * (pa + pb - 2 * pth);
    00148
    00149   delays_[2].tick( filter_.tick(pa + temp) * -0.95 );
    00150   delays_[1].tick( pb + temp );
    00151   tonehole_.tick( pa + pb - pth + temp );
    00152
    00153   return lastFrame_[0];
    00154 }
    00155
    00156 inline StkFrames& BlowHole :: tick( StkFrames& frames, unsigned int channel )
    00157 {
    00158   unsigned int nChannels = lastFrame_.channels();
    00159 #if defined(_STK_DEBUG_)
    00160   if ( channel > frames.channels() - nChannels ) {
    00161     oStream_ << "BlowHole::tick(): channel and StkFrames arguments are incompatible!";
    00162     handleError( StkError::FUNCTION_ARGUMENT );
    00163   }
    00164 #endif
    00165
    00166   StkFloat *samples = &frames[channel];
    00167   unsigned int j, hop = frames.channels() - nChannels;
    00168   if ( nChannels == 1 ) {
    00169     for ( unsigned int i=0; i<frames.frames(); i++, samples += hop )
    00170       *samples++ = tick();
    00171   }
    00172   else {
    00173     for ( unsigned int i=0; i<frames.frames(); i++, samples += hop ) {
    00174       *samples++ = tick();
    00175       for ( j=1; j<nChannels; j++ )
    00176         *samples++ = lastFrame_[j];
    00177     }
    00178   }
    00179
    00180   return frames;
    00181 }
    00182
    00183 } // stk namespace
    00184
    00185 #endif

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