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1 /* -*- c-basic-offset: 4 indent-tabs-mode: nil -*- vi:set ts=8 sts=4 sw=4: */
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2
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3 /*
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4 QM DSP Library
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5
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6 Centre for Digital Music, Queen Mary, University of London.
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7 This file copyright 2005-2006 Christian Landone.
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8 All rights reserved.
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9 */
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10
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11 #ifndef DETECTIONFUNCTION_H
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12 #define DETECTIONFUNCTION_H
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13
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14 #include "maths/MathUtilities.h"
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15 #include "maths/MathAliases.h"
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16 #include "dsp/phasevocoder/PhaseVocoder.h"
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17 #include "base/Window.h"
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18
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19 #define DF_HFC (1)
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20 #define DF_SPECDIFF (2)
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21 #define DF_PHASEDEV (3)
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22 #define DF_COMPLEXSD (4)
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23 #define DF_BROADBAND (5)
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24
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25 struct DFConfig{
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26 unsigned int stepSize; // DF step in samples
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27 unsigned int frameLength; // DF analysis window - usually 2*step
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28 int DFType; // type of detection function ( see defines )
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29 double dbRise; // only used for broadband df (and required for it)
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30 bool adaptiveWhitening; // perform adaptive whitening
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31 double whiteningRelaxCoeff; // if < 0, a sensible default will be used
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32 double whiteningFloor; // if < 0, a sensible default will be used
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33 };
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34
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35 class DetectionFunction
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36 {
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37 public:
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38 double* getSpectrumMagnitude();
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39 DetectionFunction( DFConfig Config );
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40 virtual ~DetectionFunction();
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41 double process( double* TDomain );
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42 double process( double* magnitudes, double* phases );
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43
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44 private:
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45 void whiten();
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46 double runDF();
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47
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48 double HFC( unsigned int length, double* src);
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49 double specDiff( unsigned int length, double* src);
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50 double phaseDev(unsigned int length, double *srcPhase);
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51 double complexSD(unsigned int length, double *srcMagnitude, double *srcPhase);
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52 double broadband(unsigned int length, double *srcMagnitude);
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53
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54 private:
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55 void initialise( DFConfig Config );
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56 void deInitialise();
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57
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58 int m_DFType;
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59 unsigned int m_dataLength;
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60 unsigned int m_halfLength;
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61 unsigned int m_stepSize;
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62 double m_dbRise;
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63 bool m_whiten;
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64 double m_whitenRelaxCoeff;
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65 double m_whitenFloor;
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66
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67 double* m_magHistory;
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68 double* m_phaseHistory;
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69 double* m_phaseHistoryOld;
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70 double* m_magPeaks;
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71
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72 double* m_DFWindowedFrame; // Array for windowed analysis frame
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73 double* m_magnitude; // Magnitude of analysis frame ( frequency domain )
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74 double* m_thetaAngle;// Phase of analysis frame ( frequency domain )
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75
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76 Window<double> *m_window;
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77 PhaseVocoder* m_phaseVoc; // Phase Vocoder
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78 };
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79
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80 #endif
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