sdrangel/sdrbase/dsp/ncof.h

70 wiersze
3.0 KiB
C++

///////////////////////////////////////////////////////////////////////////////////
// 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> //
// //
// 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_NCOF_H
#define INCLUDE_NCOF_H
#include "dsp/dsptypes.h"
#include "export.h"
class SDRBASE_API NCOF {
private:
enum {
TableSize = (1 << 12),
};
static Real m_table[TableSize+1];
static bool m_tableInitialized;
static float m_tableSizeLimit;
static void initTable();
Real m_phaseIncrement;
Real m_phase;
public:
NCOF();
void setFreq(Real freq, Real sampleRate);
void setPhase(Real phase) { m_phase = phase; }
int nextPhase() //!< Increment phase and return its integer value
{
m_phase += m_phaseIncrement;
while(m_phase >= m_tableSizeLimit) {
m_phase -= TableSize;
}
while(m_phase < 0.0) {
m_phase += TableSize;
}
return (int) m_phase;
}
Real next(); //!< Return next real sample
Complex nextIQ(); //!< Return next complex sample
Complex nextIQ(float imbalance); //!< Return next complex sample with an imbalance factor on I
Complex nextQI(); //!< Return next complex sample (reversed)
Real get(); //!< Return current real sample (no phase increment)
Complex getIQ(); //!< Return current complex sample (no phase increment)
void getIQ(Complex& c); //!< Sets to the current complex sample (no phase increment)
Complex getQI(); //!< Return current complex sample (no phase increment, reversed)
void getQI(Complex& c); //!< Sets to the current complex sample (no phase increment, reversed)
};
#endif // INCLUDE_NCO_H