2015-12-07 20:00:30 -05:00
|
|
|
///////////////////////////////////////////////////////////////////////////////////
|
2023-11-19 00:43:20 -05:00
|
|
|
// Copyright (C) 2012 maintech GmbH, Otto-Hahn-Str. 15, 97204 Hoechberg, Germany //
|
|
|
|
|
// written by Christian Daniel //
|
|
|
|
|
// Copyright (C) 2015-2016, 2018-2019 Edouard Griffiths, F4EXB <f4exb06@gmail.com> //
|
2015-12-07 20:00:30 -05:00
|
|
|
// //
|
|
|
|
|
// This program is free software; you can redistribute it and/or modify //
|
|
|
|
|
// it under the terms of the GNU General Public License as published by //
|
|
|
|
|
// the Free Software Foundation as version 3 of the License, or //
|
2019-04-11 08:32:15 -04:00
|
|
|
// (at your option) any later version. //
|
2015-12-07 20:00:30 -05:00
|
|
|
// //
|
|
|
|
|
// This program 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 General Public License V3 for more details. //
|
|
|
|
|
// //
|
|
|
|
|
// You should have received a copy of the GNU General Public License //
|
|
|
|
|
// along with this program. If not, see <http://www.gnu.org/licenses/>. //
|
|
|
|
|
///////////////////////////////////////////////////////////////////////////////////
|
|
|
|
|
|
|
|
|
|
#ifndef INCLUDE_DSP_FILTERRC_H_
|
|
|
|
|
#define INCLUDE_DSP_FILTERRC_H_
|
|
|
|
|
|
|
|
|
|
#include "dsp/dsptypes.h"
|
2018-03-20 08:49:21 -04:00
|
|
|
#include "export.h"
|
2015-12-07 20:00:30 -05:00
|
|
|
|
|
|
|
|
/** First order low-pass IIR filter for real-valued signals. */
|
2018-03-03 14:23:38 -05:00
|
|
|
class SDRBASE_API LowPassFilterRC
|
2015-12-07 20:00:30 -05:00
|
|
|
{
|
|
|
|
|
public:
|
|
|
|
|
|
|
|
|
|
/**
|
|
|
|
|
* Construct 1st order low-pass IIR filter.
|
|
|
|
|
*
|
|
|
|
|
* timeconst :: RC time constant in seconds (1 / (2 * PI * cutoff_freq)
|
|
|
|
|
*/
|
|
|
|
|
LowPassFilterRC(Real timeconst);
|
|
|
|
|
|
|
|
|
|
/**
|
|
|
|
|
* Reconfigure filter with new time constant
|
|
|
|
|
*/
|
2019-11-14 19:04:24 -05:00
|
|
|
void configure(Real timeconst);
|
|
|
|
|
|
|
|
|
|
/** Process samples. */
|
|
|
|
|
void process(const Real& sample_in, Real& sample_out);
|
|
|
|
|
|
|
|
|
|
private:
|
|
|
|
|
Real m_timeconst;
|
|
|
|
|
Real m_y1;
|
|
|
|
|
Real m_a1;
|
|
|
|
|
Real m_b0;
|
|
|
|
|
};
|
|
|
|
|
|
|
|
|
|
/** First order high-pass IIR filter for real-valued signals. */
|
|
|
|
|
class SDRBASE_API HighPassFilterRC
|
|
|
|
|
{
|
|
|
|
|
public:
|
|
|
|
|
|
|
|
|
|
/**
|
|
|
|
|
* Construct 1st order high-pass IIR filter.
|
|
|
|
|
*
|
|
|
|
|
* timeconst :: RC time constant in seconds (1 / (2 * PI * cutoff_freq)
|
|
|
|
|
*/
|
|
|
|
|
HighPassFilterRC(Real timeconst);
|
|
|
|
|
|
|
|
|
|
/**
|
|
|
|
|
* Reconfigure filter with new time constant
|
|
|
|
|
*/
|
|
|
|
|
void configure(Real timeconst);
|
2015-12-07 20:00:30 -05:00
|
|
|
|
|
|
|
|
/** Process samples. */
|
|
|
|
|
void process(const Real& sample_in, Real& sample_out);
|
|
|
|
|
|
|
|
|
|
private:
|
|
|
|
|
Real m_timeconst;
|
|
|
|
|
Real m_y1;
|
|
|
|
|
Real m_a1;
|
|
|
|
|
Real m_b0;
|
|
|
|
|
};
|
|
|
|
|
|
|
|
|
|
#endif /* INCLUDE_DSP_FILTERRC_H_ */
|
