mirror of
https://github.com/f4exb/sdrangel.git
synced 2024-11-27 02:09:14 -05:00
51 lines
2.0 KiB
C
51 lines
2.0 KiB
C
|
///////////////////////////////////////////////////////////////////////////////////
|
||
|
|
// Copyright (C) 2015 F4EXB //
|
||
|
|
// written by Edouard Griffiths //
|
||
|
|
// //
|
||
|
|
// 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 //
|
||
|
|
// //
|
||
|
|
// 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"
|
||
|
|
|
||
|
|
/** First order low-pass IIR filter for real-valued signals. */
|
||
|
|
class LowPassFilterRC
|
||
|
|
{
|
||
|
|
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
|
||
|
|
*/
|
||
|
|
void configure(Real timeout);
|
||
|
|
|
||
|
|
/** 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_ */
|