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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 = 8.0 );
    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
    00075
    00082   StkFrames& tick( StkFrames& frames, unsigned int channel = 0 );
    00083
    00084  protected:
    00085
    00086   DelayL delayLine_;
    00087   ReedTable reedTable_;
    00088   OneZero filter_;
    00089   Envelope envelope_;
    00090   Noise noise_;
    00091   SineWave vibrato_;
    00092
    00093   StkFloat outputGain_;
    00094   StkFloat noiseGain_;
    00095   StkFloat vibratoGain_;
    00096 };
    00097
    00098 inline StkFloat Clarinet :: tick( unsigned int )
    00099 {
    00100   StkFloat pressureDiff;
    00101   StkFloat breathPressure;
    00102
    00103   // Calculate the breath pressure (envelope + noise + vibrato)
    00104   breathPressure = envelope_.tick();
    00105   breathPressure += breathPressure * noiseGain_ * noise_.tick();
    00106   breathPressure += breathPressure * vibratoGain_ * vibrato_.tick();
    00107
    00108   // Perform commuted loss filtering.
    00109   pressureDiff = -0.95 * filter_.tick( delayLine_.lastOut() );
    00110
    00111   // Calculate pressure difference of reflected and mouthpiece pressures.
    00112   pressureDiff = pressureDiff - breathPressure;
    00113
    00114   // Perform non-linear scattering using pressure difference in reed function.
    00115   lastFrame_[0] = delayLine_.tick(breathPressure + pressureDiff * reedTable_.tick(pressureDiff));
    00116
    00117   // Apply output gain.
    00118   lastFrame_[0] *= outputGain_;
    00119
    00120   return lastFrame_[0];
    00121 }
    00122
    00123 inline StkFrames& Clarinet :: tick( StkFrames& frames, unsigned int channel )
    00124 {
    00125   unsigned int nChannels = lastFrame_.channels();
    00126 #if defined(_STK_DEBUG_)
    00127   if ( channel > frames.channels() - nChannels ) {
    00128     oStream_ << "Clarinet::tick(): channel and StkFrames arguments are incompatible!";
    00129     handleError( StkError::FUNCTION_ARGUMENT );
    00130   }
    00131 #endif
    00132
    00133   StkFloat *samples = &frames[channel];
    00134   unsigned int j, hop = frames.channels() - nChannels;
    00135   if ( nChannels == 1 ) {
    00136     for ( unsigned int i=0; i<frames.frames(); i++, samples += hop )
    00137       *samples++ = tick();
    00138   }
    00139   else {
    00140     for ( unsigned int i=0; i<frames.frames(); i++, samples += hop ) {
    00141       *samples++ = tick();
    00142       for ( j=1; j<nChannels; j++ )
    00143         *samples++ = lastFrame_[j];
    00144     }
    00145   }
    00146
    00147   return frames;
    00148 }
    00149
    00150 } // stk namespace
    00151
    00152 #endif

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