sdrangel/sdrbase/dsp/projector.h

///////////////////////////////////////////////////////////////////////////////////
// Copyright (C) 2012 maintech GmbH, Otto-Hahn-Str. 15, 97204 Hoechberg, Germany //
// written by Christian Daniel                                                   //
// Copyright (C) 2015-2019, 2021 Edouard Griffiths, F4EXB <f4exb06@gmail.com>    //
// Copyright (C) 2015 John Greb <hexameron@spam.no>                              //
//                                                                               //
// 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_PROJECTOR_H
#define SDRBASE_DSP_PROJECTOR_H

#include "export.h"
#include "dsptypes.h"

class SDRBASE_API Projector
{
public:
    enum ProjectionType
    {
        ProjectionReal = 0, //!< Extract real part
        ProjectionImag,     //!< Extract imaginary part
        ProjectionMagLin,   //!< Calculate linear magnitude or modulus
        ProjectionMagSq,    //!< Calculate linear squared magnitude or power
        ProjectionDMagSq,   //!< Calculate time derivative of linear squared magnitude or power
        ProjectionMagDB,    //!< Calculate logarithmic (dB) of squared magnitude
        ProjectionPhase,    //!< Calculate phase
        ProjectionDOAP,     //!< Calculate ambiguous DOA from phase as phase difference (assuming positive)
        ProjectionDOAN,     //!< Calculate ambiguous DOA from phase as phase difference (assuming negative)
        ProjectionDPhase,   //!< Calculate phase derivative i.e. instantaneous frequency scaled to sample rate
        ProjectionBPSK,     //!< Phase comparator BPSK evaluation
        ProjectionQPSK,     //!< Phase comparator QPSK evaluation
        Projection8PSK,     //!< Phase comparator 8-PSK evaluation
        Projection16PSK,    //!< Phase comparator 16-PSK evaluation
		nbProjectionTypes   //!< Gives the number of projections in the enum
    };

    Projector(ProjectionType projectionType);
    ~Projector();

    ProjectionType getProjectionType() const { return m_projectionType; }
    void settProjectionType(ProjectionType projectionType) { m_projectionType = projectionType; }
    void setCache(Real *cache) { m_cache = cache; }
    void setCacheMaster(bool cacheMaster) { m_cacheMaster = cacheMaster; }

    Real run(const Sample& s);
    Real run(const std::complex<float>& s);

private:
    static Real normalizeAngle(Real angle);
    ProjectionType m_projectionType;
    Real m_prevArg;
    Real m_prevVal;
    Real *m_cache;
    bool m_cacheMaster;
};

#endif // SDRBASE_DSP_PROJECTOR_H