sdrangel/sdrbase/dsp/decimatorc.h

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///////////////////////////////////////////////////////////////////////////////////
// Copyright (C) 2020 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/>. //
///////////////////////////////////////////////////////////////////////////////////
// Half-band centered decimators with Complex (i.e. omplex<float>) input/output
// Decimates by a power of two using centered half-band filters
#ifndef INCLUDE_DSP_DECIMATORC_H_
#define INCLUDE_DSP_DECIMATORC_H_
#include "dsp/dsptypes.h"
#include "dsp/inthalfbandfiltereof.h"
#include "export.h"
#define DECIMATORSXS_HB_FILTER_ORDER 64
class SDRBASE_API DecimatorC
{
public:
DecimatorC();
void setLog2Decim(unsigned int log2Decim);
bool decimate(Complex c, Complex& cd);
unsigned int getDecim() const { return m_decim; }
private:
IntHalfbandFilterEOF<DECIMATORSXS_HB_FILTER_ORDER, true> m_decimator2; // 1st stages
IntHalfbandFilterEOF<DECIMATORSXS_HB_FILTER_ORDER, true> m_decimator4; // 2nd stages
IntHalfbandFilterEOF<DECIMATORSXS_HB_FILTER_ORDER, true> m_decimator8; // 3rd stages
IntHalfbandFilterEOF<DECIMATORSXS_HB_FILTER_ORDER, true> m_decimator16; // 4th stages
IntHalfbandFilterEOF<DECIMATORSXS_HB_FILTER_ORDER, true> m_decimator32; // 5th stages
IntHalfbandFilterEOF<DECIMATORSXS_HB_FILTER_ORDER, true> m_decimator64; // 6th stages
unsigned int m_log2Decim;
unsigned int m_decim;
bool decimate2(Complex c, Complex& cd);
bool decimate4(Complex c, Complex& cd);
bool decimate8(Complex c, Complex& cd);
bool decimate16(Complex c, Complex& cd);
bool decimate32(Complex c, Complex& cd);
bool decimate64(Complex c, Complex& cd);
};
#endif // INCLUDE_DSP_DECIMATORC_H_