nco.h

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// Copyright (C) 2012 maintech GmbH, Otto-Hahn-Str. 15, 97204 Hoechberg, Germany //
// written by Christian Daniel                                                   //
//                                                                               //
// 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_NCO_H
#define INCLUDE_NCO_H

#include "dsp/dsptypes.h"
#include "export.h"

class SDRBASE_API NCO {
private:
    enum {
        TableSize = (1 << 12),
    };
    static Real m_table[TableSize];
    static bool m_tableInitialized;

    static void initTable();

    int m_phaseIncrement;
    int m_phase;

public:
    NCO();

    void setFreq(Real freq, Real sampleRate);
    void setPhase(int phase) { m_phase = phase; }

    void nextPhase()        
    {
        m_phase += m_phaseIncrement;
        while(m_phase >= TableSize)
            m_phase -= TableSize;
        while(m_phase < 0)
            m_phase += TableSize;
    }

    Real next();            
    Complex nextIQ();       
    Complex nextQI();       
    void nextIQMul(Real& i, Real& q); 
    Real get();             
    Complex getIQ();        
    void getIQ(Complex& c); 
    Complex getQI();        
    void getQI(Complex& c); 
};

#endif // INCLUDE_NCO_H