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#ifndef INCLUDE_ASSOCIATEBANDWIDTH_H
#define INCLUDE_ASSOCIATEBANDWIDTH_H
/*
* This is the Loris C++ Class Library, implementing analysis,
* manipulation, and synthesis of digitized sounds using the Reassigned
* Bandwidth-Enhanced Additive Sound Model.
*
* Loris is Copyright (c) 1999-2010 by Kelly Fitz and Lippold Haken
*
* 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
*
*
* AssociateBandwidth.h
*
* Definition of a class representing a policy for associating noise
* (bandwidth) energy with reassigned spectral peaks to be used in
* Partial formation.
*
* Kelly Fitz, 20 Jan 2000
* loris@cerlsoundgroup.org
*
* http://www.cerlsoundgroup.org/Loris/
*
*/
#include "SpectralPeaks.h"
#include <vector>
// begin namespace
namespace Loris {
class Breakpoint;
// ---------------------------------------------------------------------------
// class AssociateBandwidth
//
// In the new strategy, Breakpoints are extracted and accumulated
// as sinusoids. Spectral peaks that are not extracted (don't exceed
// the amplitude floor) or are rejected for certain reasons, are
// accumulated diectly as noise (surplus). After all spectral peaks
// have been accumulated as noise or sinusoids, the noise is distributed
// as bandwidth.
//
class AssociateBandwidth
{
// -- instance variables --
std::vector< double > _weights; // weights vector for recording
// frequency distribution of retained
// sinusoids
std::vector< double > _surplus; // surplus (noise) energy vector for
// accumulating the distribution of
// spectral energy to be distributed
// as noise
double _regionRate; // inverse of region center spacing
// -- public interface --
public:
// construction:
AssociateBandwidth( double regionWidth, double srate );
~AssociateBandwidth( void );
// Perform bandwidth association on a collection of reassigned spectral peaks
// or ridges. The range [begin, rejected) spans the Peaks selected to form
// Partials. The range [rejected, end) spans the Peaks that were found in
// the reassigned spectrum, but rejected as too weak or too close (in
// frequency) to another stronger Peak.
void associateBandwidth( Peaks::iterator begin, // beginning of Peaks
Peaks::iterator rejected, // first rejected Peak
Peaks::iterator end ); // end of Peaks
// -- private helpers --
private:
double computeNoiseEnergy( double freq, double amp );
// These four formerly comprised the public interface
// to this policy, now they are all hidden behind a
// single call to associateBandwidth.
// energy accumulation:
void accumulateNoise( double freq, double amp );
void accumulateSinusoid( double freq, double amp );
// bandwidth assocation:
void associate( SpectralPeak & pk );
// call this to wipe out the accumulated energy to
// prepare for the next frame (yuk):
void reset( void );
}; // end of class AssociateBandwidth
} // end of namespace Loris
#endif /* ndef INCLUDE_ASSOCIATEBANDWIDTH_H */
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