/usr/include/CLAM/InstantTunningEstimator.hxx is in libclam-dev 1.4.0-5.2.
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* Copyright (c) 2001-2006 MUSIC TECHNOLOGY GROUP (MTG)
* UNIVERSITAT POMPEU FABRA
*
*
* 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.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#ifndef InstantTunningEstimator_hxx
#define InstantTunningEstimator_hxx
#include <list>
#include <vector>
#include <cmath>
namespace Simac
{
/**
* This processing estimates the most probable tunning of a set of chromatic peaks.
* It does it by mapping the chromatic peaks as fasors
* in a semitone wheel and vectorially adding them.
* The inertia sets how much of the previous computed
* value it kept for the next execution.
* The instantTunning output doesn't take into account the inertia.
* @todo Explain which are the reference values the tunning is expressed relative to.
*/
class InstantTunningEstimator
{
public:
typedef std::vector<std::pair<double, double> > PeakList;
private:
double _fasorX;
double _fasorY;
double _instantX;
double _instantY;
double _inertia;
public:
InstantTunningEstimator(double inertia=0.0)
: _inertia(inertia)
{
_fasorX=1.0;
_fasorY=0.0;
}
~InstantTunningEstimator()
{
}
void setInertia(double inertia)
{
_inertia=inertia;
}
// TODO: This function is taken by S&R of the previous one, no test!!
void doIt(const std::vector<std::pair<double, double> >& peaks)
{
_fasorX*=_inertia;
_fasorY*=_inertia;
_instantX=0;
_instantY=0;
for (unsigned int peak=0; peak<peaks.size(); peak++)
{
double radiantTunning=peaks[peak].first*2*M_PI;
_instantX+=cos(radiantTunning)*peaks[peak].second;
_instantY+=sin(radiantTunning)*peaks[peak].second;
}
_fasorX += _instantX;
_fasorY += _instantY;
}
std::pair<double,double> output() const
{
double tunning=std::atan2(_fasorY,_fasorX)/2/M_PI;
double strength=std::sqrt(_fasorY*_fasorY+_fasorX*_fasorX);
return std::make_pair(tunning, strength);
}
std::pair<double,double> instantTunning() const
{
double tunning=std::atan2(_instantY,_instantX)/2/M_PI;
double strength=std::sqrt(_instantY*_instantY+_instantX*_instantX);
return std::make_pair(tunning, strength);
}
};
} // namespace Simac
#endif// InstantTunningEstimator_hxx
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