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1 /***************************************************/
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2 /*! \class SineWave
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3 \brief STK sinusoid oscillator class.
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4
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5 This class computes and saves a static sine "table" that can be
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6 shared by multiple instances. It has an interface similar to the
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7 WaveLoop class but inherits from the Generator class. Output
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8 values are computed using linear interpolation.
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9
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10 The "table" length, set in SineWave.h, is 2048 samples by default.
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11
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12 by Perry R. Cook and Gary P. Scavone, 1995--2014.
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13 */
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14 /***************************************************/
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15
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16 #include "../include/SineWave.h"
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17 #include <cmath>
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18
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19 namespace stk {
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20
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21 StkFrames SineWave :: table_;
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22
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23 SineWave :: SineWave( void )
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24 : time_(0.0), rate_(1.0), phaseOffset_(0.0)
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25 {
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26 if ( table_.empty() ) {
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27 table_.resize( TABLE_SIZE + 1, 1 );
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28 StkFloat temp = 1.0 / TABLE_SIZE;
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29 for ( unsigned long i=0; i<=TABLE_SIZE; i++ )
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30 table_[i] = sin( TWO_PI * i * temp );
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31 }
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32
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33 Stk::addSampleRateAlert( this );
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34 }
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35
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36 SineWave :: ~SineWave()
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37 {
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38 Stk::removeSampleRateAlert( this );
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39 }
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40
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41 void SineWave :: sampleRateChanged( StkFloat newRate, StkFloat oldRate )
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42 {
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43 if ( !ignoreSampleRateChange_ )
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44 this->setRate( oldRate * rate_ / newRate );
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45 }
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46
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47 void SineWave :: reset( void )
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48 {
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49 time_ = 0.0;
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50 lastFrame_[0] = 0;
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51 }
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52
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53 void SineWave :: setFrequency( StkFloat frequency )
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54 {
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55 // This is a looping frequency.
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56 this->setRate( TABLE_SIZE * frequency / Stk::sampleRate() );
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57 }
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58
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59 void SineWave :: addTime( StkFloat time )
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60 {
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61 // Add an absolute time in samples.
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62 time_ += time;
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63 }
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64
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65 void SineWave :: addPhase( StkFloat phase )
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66 {
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67 // Add a time in cycles (one cycle = TABLE_SIZE).
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68 time_ += TABLE_SIZE * phase;
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69 }
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70
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71 void SineWave :: addPhaseOffset( StkFloat phaseOffset )
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72 {
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73 // Add a phase offset relative to any previous offset value.
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74 time_ += ( phaseOffset - phaseOffset_ ) * TABLE_SIZE;
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75 phaseOffset_ = phaseOffset;
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76 }
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77
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78 } // stk namespace
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