/usr/include/CLAM/ConstantQTransform.hxx is in libclam-dev 1.4.0-6.
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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 ConstantQTransform_hxx
#define ConstantQTransform_hxx
#include <vector>
#include <cmath>
namespace Simac
{
/**
* ConstantQTransform extract a ConstantQ spectrum using Blankertz's paper algorithm.
* This transformation is similar to the Fourier transform but it generates
* bins which bins are proportional to their center frequency.
*
* This implementation saves computational time by moving most computation to
* configuration time and using a fft as starting point for the transform.
*
* \b Parameters:
* - samplinRate: The sampling rate for the input audio
* - minFrequency: The minimum frequency to be considered
* - maxFrequency: The maximum frequency to be considered
* - binsPerOctave: The number of bins required for each octave
*
* \b Configuration Outputs:
* - Q: Quality factor for the bins
* - K: Number of Constant Q spectrum bins
* - spectrumSize: Number of required fft spectrum bins
*
* \b Inputs:
* - spectrum: An interlaced complex spectrum (complex, so, size 2*fftLength)
*
* \b Outputs:
* - constantQSpectrum: An interlaced complex spectrum (complex, so, size 2*K)
*/
class ConstantQTransform
{
public:
typedef std::vector<double> ConstantQSpectrum;
typedef std::vector<double> Spectrum;
private:
ConstantQSpectrum cqdata;
unsigned FS;
double fmin;
double fmax;
double Q;
unsigned _binsPerOctave;
unsigned mSpectrumSize;
unsigned K;
// Sparse complex numbers matrix represented by the i and j indexes
// for non null cells and the real and imaginary components of the cell
std::vector<unsigned> mSparseKernelIs;
std::vector<unsigned> mSparseKernelJs;
std::vector<double> mSparseKernelImagValues;
std::vector<double> mSparseKernelRealValues;
public:
void doIt(const std::vector<double> & fftData);
//public functions incl. sparsekernel so can keep out of loop in main
public:
ConstantQTransform(unsigned FS, double fmin, double fmax, unsigned binsPerOctave);
void sparsekernel(double);
~ConstantQTransform();
// Results
const ConstantQSpectrum & constantQSpectrum() const {return cqdata;}
double getQ() const {return Q;}
int getK() const {return K;}
int getfftlength() const {return mSpectrumSize;}
private:
double Hamming(int len, int n) {
double out = 0.54 - 0.46*std::cos(2*M_PI*n/len);
return(out);
}
};
}
#endif//ConstantQTransform_hxx
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