mirror of
https://github.com/f4exb/sdrangel.git
synced 2024-11-05 00:11:16 -05:00
50 lines
2.1 KiB
C++
50 lines
2.1 KiB
C++
///////////////////////////////////////////////////////////////////////////////////
|
|
// Copyright (C) 2017 Edouard Griffiths, F4EXB //
|
|
// //
|
|
// 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 //
|
|
// (at your option) any later version. //
|
|
// //
|
|
// 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 SDRBASE_DSP_RECURSIVEFILTERS_H_
|
|
#define SDRBASE_DSP_RECURSIVEFILTERS_H_
|
|
|
|
#include "export.h"
|
|
|
|
/**
|
|
* \Brief: This is a second order bandpass filter using recursive method. r is in range ]0..1[ the higher the steeper the filter.
|
|
* inspired by:http://www.ece.umd.edu/~tretter/commlab/c6713slides/FSKSlides.pdf
|
|
*/
|
|
class SDRBASE_API SecondOrderRecursiveFilter
|
|
{
|
|
public:
|
|
SecondOrderRecursiveFilter(float samplingFrequency, float centerFrequency, float r);
|
|
~SecondOrderRecursiveFilter();
|
|
|
|
void setFrequencies(float samplingFrequency, float centerFrequency);
|
|
void setR(float r);
|
|
short run(short sample);
|
|
float run(float sample);
|
|
|
|
private:
|
|
void init();
|
|
|
|
float m_r;
|
|
float m_frequencyRatio;
|
|
float m_f;
|
|
float m_v[3];
|
|
};
|
|
|
|
|
|
|
|
#endif /* SDRBASE_DSP_RECURSIVEFILTERS_H_ */
|