fftwindow.cpp

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// Copyright (C) 2012 maintech GmbH, Otto-Hahn-Str. 15, 97204 Hoechberg, Germany //
// written by Christian Daniel                                                   //
//                                                                               //
// 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 as version 3 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 V3 for more details.                               //
//                                                                               //
// You should have received a copy of the GNU General Public License             //
// along with this program. If not, see <http://www.gnu.org/licenses/>.          //

#include "dsp/fftwindow.h"

void FFTWindow::create(Function function, int n)
{
    Real (*wFunc)(Real n, Real i);

    m_window.clear();

    switch(function) {
        case Flattop:
            wFunc = flatTop;
            break;

        case Bartlett:
            wFunc = bartlett;
            break;

        case BlackmanHarris:
            wFunc = blackmanHarris;
            break;

        case Hamming:
            wFunc = hamming;
            break;

        case Hanning:
            wFunc = hanning;
            break;

        case Rectangle:
        default:
            wFunc = rectangle;
            break;
    }

    for(int i = 0; i < n; i++)
        m_window.push_back(wFunc(n, i));
}

void FFTWindow::apply(const std::vector<Real>& in, std::vector<Real>* out)
{
    for(size_t i = 0; i < m_window.size(); i++)
        (*out)[i] = in[i] * m_window[i];
}

void FFTWindow::apply(const std::vector<Complex>& in, std::vector<Complex>* out)
{
    for(size_t i = 0; i < m_window.size(); i++)
        (*out)[i] = in[i] * m_window[i];
}

void FFTWindow::apply(const Complex* in, Complex* out)
{
    for(size_t i = 0; i < m_window.size(); i++)
        out[i] = in[i] * m_window[i];
}