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48 lines
2.0 KiB
C++
48 lines
2.0 KiB
C++
///////////////////////////////////////////////////////////////////////////////////
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// Copyright (C) 2017 Edouard Griffiths, F4EXB //
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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 as version 3 of the License, or //
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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 V3 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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#ifndef SDRBASE_DSP_RECURSIVEFILTERS_H_
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#define SDRBASE_DSP_RECURSIVEFILTERS_H_
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#include "util/export.h"
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/**
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* \Brief: This is a second order bandpass filter using recursive method. r is in range ]0..1[ the higher the steeper the filter.
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* inspired by:http://www.ece.umd.edu/~tretter/commlab/c6713slides/FSKSlides.pdf
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*/
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class SDRBASE_API SecondOrderRecursiveFilter
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{
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public:
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SecondOrderRecursiveFilter(float samplingFrequency, float centerFrequency, float r);
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~SecondOrderRecursiveFilter();
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void setFrequencies(float samplingFrequency, float centerFrequency);
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void setR(float r);
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short run(short sample);
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float run(float sample);
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private:
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void init();
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float m_r;
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float m_frequencyRatio;
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float m_v[3];
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};
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#endif /* SDRBASE_DSP_RECURSIVEFILTERS_H_ */
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