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// Copyright 2007 "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 "SPWindow.h"
using namespace std;
vector<double> Music::hann(int n)
{
vector<double> win(n);
for(size_t n=0; n<win.size(); n++)
win[n] = (1-cos(2*Math::Pi*n/(win.size()-1))) / (win.size()-1);
return win;
}
vector<double> Music::hamming(int n)
{
vector<double> win(n);
double s = 0.0;
for(size_t n=0; n<win.size(); n++)
{
win[n] = (0.54-0.46*cos(2*Math::Pi*n/(win.size()-1)));
s += win[n];
}
for(size_t n=0; n<win.size(); n++)
win[n] /= s;
return win;
}
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