/** An exponential window.
 *
 * @file
 * @author Steffen Vogel <svogel2@eonerc.rwth-aachen.de>
 * @copyright 2014-2022, Institute for Automation of Complex Power Systems, EONERC
 * @license Apache License 2.0
 *********************************************************************************/

#pragma once

#include <villas/dsp/window.hpp>

namespace villas {
namespace dsp {

template<typename T>
class ExponentialWindow {

protected:
	T a;
	T last;

public:
	ExponentialWindow(T _a, T i = 0) :
		a(a),
		last(i)
	{ }

	T update(T in)
	{
		last = a * in + (1 - a) * last;

		return last;
	}
};

} /* namespace dsp */
} /* namespace villas */