ncof.h

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// Copyright (C) 2016 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 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()        
    {
        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();                        
    Complex nextIQ();                   
    Complex nextIQ(float imbalance);    
    Complex nextQI();                   
    Real get();                         
    Complex getIQ();                    
    void getIQ(Complex& c);             
    Complex getQI();                    
    void getQI(Complex& c);             
};

#endif // INCLUDE_NCO_H