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// Copyright 2004 "Gilles Degottex"
// This file is part of "Music"
// "Music" is free software; you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation; either version 2.1 of the License, or
// (at your option) any later version.
//
// "Music" 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 Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser 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
#include "Convolution.h"
#include <iostream>
using namespace std;
#include <CppAddons/CAMath.h>
#include "Music.h"
#include "SPWindow.h"
namespace Music
{
Convolution::Convolution(double latency_factor, double gauss_factor, double ht)
: m_ht(ht)
, m_freq(h2f(m_ht))
, m_latency_factor(latency_factor)
, m_duration(m_latency_factor/m_freq)
, m_wave(int(m_duration*GetSamplingRate()))
{
// cout << "Convolution::Convolution " << ht << endl;
double c = - 2.0*Math::Pi * m_freq / GetSamplingRate();
double u = Usefull(Win_Sinc(gauss_factor));
for(size_t j=0; j<m_wave.size(); j++)
m_wave[j] = exp(complex<double>(0.0, c*j))*double(2.0/m_wave.size()) * win_sinc(j/double(m_wave.size()), gauss_factor)/u;
// m_wave[j] = exp(complex<double>(0.0, c*j))*double(2.0*Math::Pi/m_wave.size()) * win_sinc(j/double(m_wave.size()), win_factor)/u;
}
void Convolution::apply(const deque<double>& buff, int start)
{
m_value = complex<double>(0.0,0.0);
if(buff.size()-start >= m_wave.size())
{
for(size_t i=0; i<m_wave.size(); i++)
m_value += m_wave[i]*buff[i+start];
}
}
}
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