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129 lines
3.1 KiB
C++
129 lines
3.1 KiB
C++
/* cblock.c
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This file is part of a program that implements a Software-Defined Radio.
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Copyright (C) 2013, 2016 Warren Pratt, NR0V
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Copyright (C) 2024 Edouard Griffiths, F4EXB Adapted to SDRangel
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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The author can be reached by email at
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warren@wpratt.com
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*/
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#include "comm.hpp"
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#include "cblock.hpp"
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namespace WDSP {
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void CBL::calc()
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{
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prevIin = 0.0;
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prevQin = 0.0;
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prevIout = 0.0;
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prevQout = 0.0;
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mtau = exp(-1.0 / (sample_rate * tau));
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}
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CBL::CBL(
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int _run,
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int _buff_size,
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float *_in_buff,
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float *_out_buff,
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int _mode,
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int _sample_rate,
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double _tau
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)
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{
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run = _run;
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buff_size = _buff_size;
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in_buff = _in_buff;
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out_buff = _out_buff;
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mode = _mode;
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sample_rate = (double) _sample_rate;
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tau = _tau;
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calc();
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}
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void CBL::flush()
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{
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prevIin = 0.0;
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prevQin = 0.0;
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prevIout = 0.0;
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prevQout = 0.0;
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}
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void CBL::execute()
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{
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if (run)
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{
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int i;
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double tempI, tempQ;
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for (i = 0; i < buff_size; i++)
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{
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tempI = in_buff[2 * i + 0];
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tempQ = in_buff[2 * i + 1];
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out_buff[2 * i + 0] = in_buff[2 * i + 0] - prevIin + mtau * prevIout;
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out_buff[2 * i + 1] = in_buff[2 * i + 1] - prevQin + mtau * prevQout;
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prevIin = tempI;
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prevQin = tempQ;
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if (fabs(prevIout = out_buff[2 * i + 0]) < 1.0e-20)
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prevIout = 0.0;
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if (fabs(prevQout = out_buff[2 * i + 1]) < 1.0e-20)
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prevQout = 0.0;
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}
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}
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else if (in_buff != out_buff)
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{
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std::copy(in_buff, in_buff + buff_size * 2, out_buff);
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}
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}
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void CBL::setBuffers(float* _in, float* _out)
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{
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in_buff = _in;
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out_buff = _out;
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}
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void CBL::setSamplerate(int _rate)
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{
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sample_rate = _rate;
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calc();
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}
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void CBL::setSize(int _size)
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{
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buff_size = _size;
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flush();
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}
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/********************************************************************************************************
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* *
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* RXA Properties *
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* *
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********************************************************************************************************/
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void CBL::setRun(int setit)
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{
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run = setit;
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}
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} // namespace WDSP
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