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164 lines
3.9 KiB
C++
164 lines
3.9 KiB
C++
/* phrot.c
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This file is part of a program that implements a Software-Defined Radio.
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Copyright (C) 2014, 2022, 2023 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 "phrot.hpp"
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namespace WDSP {
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/********************************************************************************************************
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* *
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* Phase Rotator *
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* *
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********************************************************************************************************/
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void PHROT::calc()
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{
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double g;
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x0.resize(nstages);
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x1.resize(nstages);
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y0.resize(nstages);
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y1.resize(nstages);
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g = tan (PI * fc / (float)rate);
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b0 = (g - 1.0) / (g + 1.0);
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b1 = 1.0;
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a1 = b0;
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}
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PHROT::PHROT(
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int _run,
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int _size,
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float* _in,
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float* _out,
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int _rate,
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double _fc,
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int _nstages
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) :
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run(_run),
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size(_size),
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in(_in),
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out(_out),
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rate(_rate),
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fc(_fc),
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nstages(_nstages)
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{
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reverse = 0;
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calc();
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}
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void PHROT::flush()
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{
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std::fill (x0.begin(), x0.end(), 0);
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std::fill (x1.begin(), x1.end(), 0);
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std::fill (y0.begin(), y0.end(), 0);
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std::fill (y1.begin(), y1.end(), 0);
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}
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void PHROT::execute()
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{
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if (reverse)
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{
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for (int i = 0; i < size; i++)
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in[2 * i + 0] = -in[2 * i + 0];
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}
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if (run)
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{
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for (int i = 0; i < size; i++)
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{
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x0[0] = in[2 * i + 0];
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for (int n = 0; n < nstages; n++)
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{
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if (n > 0) x0[n] = y0[n - 1];
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y0[n] = b0 * x0[n]
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+ b1 * x1[n]
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- a1 * y1[n];
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y1[n] = y0[n];
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x1[n] = x0[n];
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}
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out[2 * i + 0] = (float) y0[nstages - 1];
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}
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}
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else if (out != in)
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{
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std::copy( in, in + size * 2, out);
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}
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}
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void PHROT::setBuffers(float* _in, float* _out)
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{
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in = _in;
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out = _out;
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}
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void PHROT::setSamplerate(int _rate)
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{
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rate = _rate;
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calc();
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}
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void PHROT::setSize(int _size)
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{
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size = _size;
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flush();
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}
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/********************************************************************************************************
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* *
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* TXA Properties *
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* *
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********************************************************************************************************/
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void PHROT::setRun(int _run)
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{
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run = _run;
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if (run)
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flush();
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}
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void PHROT::setCorner(double corner)
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{
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fc = corner;
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calc();
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}
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void PHROT::setNstages(int _nstages)
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{
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nstages = _nstages;
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calc();
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}
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void PHROT::setReverse(int _reverse)
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{
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reverse = _reverse;
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}
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} // namespace WDSP
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