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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 "dsp/maths/MathUtilities.h"
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15 #include "dsp/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
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24 struct DFConfig{
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25 double stepSecs; // DF step in seconds
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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 };
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30
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31 class DetectionFunction
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32 {
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33 public:
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34 double* getSpectrumMagnitude();
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35 DetectionFunction( DFConfig Config );
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36 virtual ~DetectionFunction();
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37 double process( double* TDomain );
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38
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39 private:
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40 double HFC( unsigned int length, double* src);
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41 double specDiff( unsigned int length, double* src);
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42 double phaseDev(unsigned int length, double *srcMagnitude, double *srcPhase);
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43 double complexSD(unsigned int length, double *srcMagnitude, double *srcPhase);
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44
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45 private:
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46 void initialise( DFConfig Config );
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47 void deInitialise();
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48
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49 int m_DFType;
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50 unsigned int m_dataLength;
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51 unsigned int m_halfLength;
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52
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53 double* magHistory;
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54 double* phaseHistory;
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55 double* phaseHistoryOld;
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56
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57 double* m_DFWindowedFrame; // Array for windowed analysis frame
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58 double* m_magnitude; // Magnitude of analysis frame ( frequency domain )
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59 double* m_thetaAngle;// Phase of analysis frame ( frequency domain )
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60
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61
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62 vector < ComplexData > meas ;
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63
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64 ComplexData j;
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65
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66 Window<double> *m_window;
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67
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68 PhaseVocoder* m_phaseVoc; // Phase Vocoder
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69
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70 };
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71
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72 #endif
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