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146 lines
3.6 KiB
C++
146 lines
3.6 KiB
C++
/* delay.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, 2019 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 "delay.hpp"
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#include "fir.hpp"
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namespace WDSP {
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DELAY::DELAY(
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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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float _tdelta,
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float _tdelay
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)
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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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tdelta = _tdelta;
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tdelay = _tdelay;
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L = (int)(0.5 + 1.0 / (tdelta * (float)rate));
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adelta = 1.0f / (float) (rate * L);
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ft = 0.45f / (float)L;
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ncoef = (int)(60.0 / ft);
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ncoef = (ncoef / L + 1) * L;
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cpp = ncoef / L;
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phnum = (int)(0.5 + tdelay / adelta);
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snum = phnum / L;
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phnum %= L;
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idx_in = 0;
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adelay = adelta * (float) (snum * L + phnum);
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FIR::fir_bandpass (h, ncoef,-ft, +ft, 1.0, 1, 0, (float)L);
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rsize = cpp + (WSDEL - 1);
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ring.resize(rsize * 2);
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}
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void DELAY::flush()
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{
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std::fill(ring.begin(), ring.end(), 0);
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idx_in = 0;
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}
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void DELAY::execute()
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{
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if (run)
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{
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int j;
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int k;
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int idx;
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int n;
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float Itmp;
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float Qtmp;
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for (int i = 0; i < size; i++)
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{
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ring[2 * idx_in + 0] = in[2 * i + 0];
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ring[2 * idx_in + 1] = in[2 * i + 1];
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Itmp = 0.0;
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Qtmp = 0.0;
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if ((n = idx_in + snum) >= rsize)
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n -= rsize;
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for (j = 0, k = L - 1 - phnum; j < cpp; j++, k+= L)
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{
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if ((idx = n + j) >= rsize)
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idx -= rsize;
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Itmp += ring[2 * idx + 0] * h[k];
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Qtmp += ring[2 * idx + 1] * h[k];
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}
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out[2 * i + 0] = Itmp;
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out[2 * i + 1] = Qtmp;
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if (--idx_in < 0)
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idx_in = rsize - 1;
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}
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}
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else if (out != in)
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std::copy( in, in + size * 2, out);
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}
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/********************************************************************************************************
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* *
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* Properties *
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* *
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********************************************************************************************************/
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void DELAY::setRun(int _run)
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{
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run = _run;
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}
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float DELAY::setValue(float _tdelay)
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{
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float _adelay;
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tdelay = _tdelay;
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phnum = (int)(0.5 + tdelay / adelta);
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snum = phnum / L;
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phnum %= L;
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_adelay = adelta * (float) (snum * L + phnum);
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adelay = _adelay;
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return adelay;
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}
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void DELAY::setBuffs(int _size, float* _in, float* _out)
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{
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size = _size;
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in = _in;
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out = _out;
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}
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} // namespace WDSP
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