ProcIIR.h

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// SPDX-License-Identifier: LGPL-3.0-or-later
/***********************************************************************************/
/*  Copyright 2009 WSL Institute for Snow and Avalanche Research    SLF-DAVOS      */
/***********************************************************************************/
/* This file is part of MeteoIO.
    MeteoIO 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 3 of the License, or
    (at your option) any later version.
 
    MeteoIO 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 MeteoIO.  If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef PROCIIR_H
#define PROCIIR_H
 
#include <meteoio/meteoFilters/ProcessingBlock.h>
#include <vector>
#include <string>
 
namespace mio {
 
class ProcIIR : public ProcessingBlock {
        public:
                ProcIIR(const std::vector< std::pair<std::string, std::string> >& vecArgs, const std::string& name, const Config& cfg);
 
                virtual void process(const unsigned int& param, const std::vector<MeteoData>& ivec,
                                     std::vector<MeteoData>& ovec) override;
 
        private:
                typedef enum IIR_TYPE {
                        BUTTERWORTH,
                        CRITICALLY_DAMPED,
                        BESSEL
                } IIR_Type;
 
                static void getFilterParameters(const IIR_Type& i_type, const bool& isLowPass, const double& n, double &i_g, double &i_p, double &i_c);
                static double filterPoint(const double& raw_val, const double A[3], const double B[3], std::vector<double> &X, std::vector<double> &Y);
                void computeCoefficients(const double& fs, const double& f0, double A[3], double B[3]) const;
 
                void parse_args(const std::vector< std::pair<std::string, std::string> >& vecArgs);
 
                double cutoff;
                double g, p, c; 
                IIR_Type type;
                bool bidirectional, low_pass;
};
 
} //end namespace
 
#endif