mirror of
https://github.com/ra3xdh/qucs_s
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83 lines
2.4 KiB
C++
83 lines
2.4 KiB
C++
/***************************************************************************
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copyright: (C) 2010 by Michael Margraf
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***************************************************************************/
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/***************************************************************************
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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 2 of the License, or *
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* (at your option) any later version. *
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* *
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***************************************************************************/
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#ifndef FILTER_H
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#define FILTER_H
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#define CLASS_LOWPASS 0
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#define CLASS_HIGHPASS 1
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#define CLASS_BANDPASS 2
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#define CLASS_BANDSTOP 3
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#define TYPE_BESSEL 0
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#define TYPE_BUTTERWORTH 1
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#define TYPE_CHEBYSHEV 2
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#define TYPE_CAUER 3
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#include <cmath>
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static const double pi = 3.1415926535897932384626433832795029; /* pi */
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static const double one_over_pi = 0.3183098861837906715377675267450287; /* 1/pi */
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static const double ln2 = 0.6931471805599453094172321214581766; /* log_e(2) */
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static const double LIGHTSPEED = 299792458.0;
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static const double Z_FIELD = 376.73031346958504364963;
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/*! coth function */
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static inline double coth(const double x) {
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return (1.0 + 2.0 / (exp(2.0*(x)) - 1.0));
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}
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/*! sech function */
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static inline double sech(const double x) {
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return (2.0 / (exp(x) + exp(-(x))));
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}
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struct tFilter {
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int Type;
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int Class;
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int Order;
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double Ripple; // in dB
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double Impedance;
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double Frequency;
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double Frequency2;
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double Frequency3;
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double Attenuation;
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};
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class QString;
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class Filter {
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public:
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Filter();
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static double getNormValue(int, tFilter*);
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static double getQuadraticNormValues(int, tFilter*, double&);
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protected:
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static QString num2str(double);
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static double getE6value(double);
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private:
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static double BesselValue(int, int);
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static double ButterworthValue(int, int);
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static double ChebyshevValue(int, int, double);
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static double quadraticBesselValues(int, int, double&);
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static double quadraticButterworthValues(int, int, double&);
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static double quadraticChebyshevValues(int, int, double, double&);
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};
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#endif
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