1 /* -*- c-basic-offset: 4 indent-tabs-mode: nil -*- vi:set ts=8 sts=4 sw=4: */
6 Centre for Digital Music, Queen Mary, University of London.
7 This file 2005-2006 Christian Landone.
9 This program is free software; you can redistribute it and/or
10 modify it under the terms of the GNU General Public License as
11 published by the Free Software Foundation; either version 2 of the
12 License, or (at your option) any later version. See the file
13 COPYING included with this distribution for more information.
16 #ifndef DETECTIONFUNCTION_H
17 #define DETECTIONFUNCTION_H
19 #include "maths/MathUtilities.h"
20 #include "maths/MathAliases.h"
21 #include "dsp/phasevocoder/PhaseVocoder.h"
22 #include "base/Window.h"
25 #define DF_SPECDIFF (2)
26 #define DF_PHASEDEV (3)
27 #define DF_COMPLEXSD (4)
28 #define DF_BROADBAND (5)
31 unsigned int stepSize; // DF step in samples
32 unsigned int frameLength; // DF analysis window - usually 2*step. Must be even!
33 int DFType; // type of detection function ( see defines )
34 double dbRise; // only used for broadband df (and required for it)
35 bool adaptiveWhitening; // perform adaptive whitening
36 double whiteningRelaxCoeff; // if < 0, a sensible default will be used
37 double whiteningFloor; // if < 0, a sensible default will be used
40 class DetectionFunction
43 double* getSpectrumMagnitude();
44 DetectionFunction( DFConfig Config );
45 virtual ~DetectionFunction();
48 * Process a single time-domain frame of audio, provided as
49 * frameLength samples.
51 double processTimeDomain(const double* samples);
54 * Process a single frequency-domain frame, provided as
55 * frameLength/2+1 real and imaginary component values.
57 double processFrequencyDomain(const double* reals, const double* imags);
63 double HFC( unsigned int length, double* src);
64 double specDiff( unsigned int length, double* src);
65 double phaseDev(unsigned int length, double *srcPhase);
66 double complexSD(unsigned int length, double *srcMagnitude, double *srcPhase);
67 double broadband(unsigned int length, double *srcMagnitude);
70 void initialise( DFConfig Config );
74 unsigned int m_dataLength;
75 unsigned int m_halfLength;
76 unsigned int m_stepSize;
79 double m_whitenRelaxCoeff;
83 double* m_phaseHistory;
84 double* m_phaseHistoryOld;
87 double* m_windowed; // Array for windowed analysis frame
88 double* m_magnitude; // Magnitude of analysis frame ( frequency domain )
89 double* m_thetaAngle;// Phase of analysis frame ( frequency domain )
90 double* m_unwrapped; // Unwrapped phase of analysis frame
92 Window<double> *m_window;
93 PhaseVocoder* m_phaseVoc; // Phase Vocoder