2020-11-24 07:31:16 -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> //
|
|
|
|
|
// Copyright (C) 2020 Jon Beniston, M7RCE <jon@beniston.com> //
|
2020-11-24 07:31:16 -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 //
|
|
|
|
|
// (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 INCLUDE_GOERTZEL_H
|
|
|
|
|
#define INCLUDE_GOERTZEL_H
|
|
|
|
|
|
|
|
|
|
#include <complex>
|
|
|
|
|
|
|
|
|
|
#include "export.h"
|
|
|
|
|
|
|
|
|
|
// Goertzel filter for calculting discrete Fourier transform for a single frequency
|
|
|
|
|
// Implementation supports non-integer multiples of fundamental frequency, see:
|
|
|
|
|
// https://asp-eurasipjournals.springeropen.com/track/pdf/10.1186/1687-6180-2012-56.pdf
|
|
|
|
|
class SDRBASE_API Goertzel
|
|
|
|
|
{
|
|
|
|
|
public:
|
|
|
|
|
Goertzel(double frequency, int sampleRate);
|
|
|
|
|
void reset();
|
|
|
|
|
void filter(double sample);
|
|
|
|
|
std::complex<double> goertzel(double lastSample);
|
|
|
|
|
double mag();
|
|
|
|
|
double phase();
|
|
|
|
|
int size() { return m_sampleCount; }
|
|
|
|
|
|
|
|
|
|
private:
|
|
|
|
|
double m_s0, m_s1, m_s2;
|
|
|
|
|
double m_a, m_b;
|
|
|
|
|
std::complex<double> m_c, m_z;
|
|
|
|
|
int m_sampleCount;
|
|
|
|
|
};
|
|
|
|
|
|
|
|
|
|
#endif // INCLUDE_GOERTZEL_H
|
