annotate dsp/chromagram/ConstantQ.h @ 321:f1e6be2de9a5

A threshold (delta) is added in the peak picking parameters structure (PPickParams). It is used as an offset when computing the smoothed detection function. A constructor for the structure PPickParams is also added to set the parameters to 0 when a structure instance is created. Hence programmes using the peak picking parameter structure and which do not set the delta parameter (e.g. QM Vamp note onset detector) won't be affected by the modifications.

Functions modified:
- dsp/onsets/PeakPicking.cpp
- dsp/onsets/PeakPicking.h
- dsp/signalconditioning/DFProcess.cpp
- dsp/signalconditioning/DFProcess.h

/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */

/*
    QM DSP Library

    Centre for Digital Music, Queen Mary, University of London.
    This file 2005-2006 Christian Landone.

    This program is free software; you can redistribute it and/or
    modify it under the terms of the GNU General Public License as
    published by the Free Software Foundation; either version 2 of the
    License, or (at your option) any later version.  See the file
    COPYING included with this distribution for more information.
*/

#ifndef CONSTANTQ_H
#define CONSTANTQ_H

#include <vector>
#include "maths/MathAliases.h"
#include "maths/MathUtilities.h"

struct CQConfig{
    unsigned int FS;   // samplerate
    double min;        // minimum frequency
    double max;        // maximum frequency
    unsigned int BPO;  // bins per octave
    double CQThresh;   // threshold
};

class ConstantQ {
	
//public functions incl. sparsekernel so can keep out of loop in main
public:
    void process( const double* FFTRe, const double* FFTIm,
                  double* CQRe, double* CQIm );

    ConstantQ( CQConfig Config );
    ~ConstantQ();

    double* process( const double* FFTData );

    void sparsekernel();

    double hamming(int len, int n) {
	double out = 0.54 - 0.46*cos(2*PI*n/len);
	return(out);
    }
	
    int getnumwin() { return m_numWin;}
    double getQ() { return m_dQ;}
    int getK() {return m_uK ;}
    int getfftlength() { return m_FFTLength;}
    int gethop() { return m_hop;}

private:
    void initialise( CQConfig Config );
    void deInitialise();
	
    double* m_CQdata;
    unsigned int m_FS;
    double m_FMin;
    double m_FMax;
    double m_dQ;
    double m_CQThresh;
    unsigned int m_numWin;
    unsigned int m_hop;
    unsigned int m_BPO;
    unsigned int m_FFTLength;
    unsigned int m_uK;

    struct SparseKernel {
        std::vector<unsigned> is;
        std::vector<unsigned> js;
        std::vector<double> imag;
        std::vector<double> real;
    };

    SparseKernel *m_sparseKernel;
};


#endif//CONSTANTQ_H