50 lines
1.3 KiB
C
50 lines
1.3 KiB
C
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/*
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* Copyright (C) 2015-2020 by Jonathan Naylor G4KLX
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* Copyright (C) 2020 by Geoffrey Merck - F4FXL KC3FRA
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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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* 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, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#if !defined(IIRDIRECTFORM1FILTER_H)
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#define IIRDIRECTFORM1FILTER_H
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class CIIRDirectForm1Filter
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{
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public:
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CIIRDirectForm1Filter(float b0, float b1, float b2, float, float a1, float a2, float additionalGaindB);
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float filter(float sample);
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void reset();
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private:
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// delay line
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float m_x2; // x[n-2]
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float m_y2; // y[n-2]
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float m_x1; // x[n-1]
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float m_y1; // y[n-1]
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// coefficients
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// FIR
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float m_b0;
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float m_b1;
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float m_b2;
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// IIR
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float m_a1;
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float m_a2;
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float m_additionalGainLin;
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};
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#endif
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