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dsp: added infinitively long exponential window
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common/include/villas/dsp/exponential_window.hpp
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common/include/villas/dsp/exponential_window.hpp
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/** An exponential window.
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*
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* @file
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* @author Steffen Vogel <stvogel@eonerc.rwth-aachen.de>
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* @copyright 2014-2019, Institute for Automation of Complex Power Systems, EONERC
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* @license GNU General Public License (version 3)
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*
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* VILLAScommon
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*********************************************************************************/
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#pragma once
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#include <villas/dsp/window.hpp>
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namespace villas {
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namespace dsp {
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template<typename T>
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class ExponentialWindow {
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protected:
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T a;
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T last;
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public:
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ExponentialWindow(T _a, T i = 0) :
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a(a),
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last(i)
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{ }
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T update(T in)
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{
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last = a * in + (1 - a) * last;
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return last;
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}
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};
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} // namespace dsp
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} // namespace villas
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