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133 lines
3.3 KiB
C++
133 lines
3.3 KiB
C++
/* firmin.c
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This file is part of a program that implements a Software-Defined Radio.
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Copyright (C) 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 "fir.hpp"
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#include "firmin.hpp"
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namespace WDSP {
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/********************************************************************************************************
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* *
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* Time-Domain FIR *
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* *
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********************************************************************************************************/
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void FIRMIN::calc()
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{
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FIR::fir_bandpass (h, nc, f_low, f_high, samplerate, wintype, 1, gain);
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rsize = nc;
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mask = rsize - 1;
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ring.resize(rsize * 2);
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idx = 0;
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}
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FIRMIN::FIRMIN(
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int _run,
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int _position,
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int _size,
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float* _in,
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float* _out,
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int _nc,
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float _f_low,
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float _f_high,
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int _samplerate,
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int _wintype,
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float _gain
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)
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{
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run = _run;
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position = _position;
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size = _size;
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in = _in;
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out = _out;
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nc = _nc;
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f_low = _f_low;
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f_high = _f_high;
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samplerate = (float) _samplerate;
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wintype = _wintype;
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gain = _gain;
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calc();
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}
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void FIRMIN::flush()
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{
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std::fill(ring.begin(), ring.end(), 0);
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idx = 0;
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}
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void FIRMIN::execute(int _pos)
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{
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if (run && position == _pos)
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{
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int k;
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for (int i = 0; i < size; i++)
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{
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ring[2 * idx + 0] = in[2 * i + 0];
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ring[2 * idx + 1] = in[2 * i + 1];
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out[2 * i + 0] = 0.0;
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out[2 * i + 1] = 0.0;
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k = idx;
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for (int j = 0; j < nc; j++)
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{
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out[2 * i + 0] += h[2 * j + 0] * ring[2 * k + 0] - h[2 * j + 1] * ring[2 * k + 1];
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out[2 * i + 1] += h[2 * j + 0] * ring[2 * k + 1] + h[2 * j + 1] * ring[2 * k + 0];
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k = (k + mask) & mask;
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}
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idx = (idx + 1) & mask;
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}
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}
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else if (in != out)
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std::copy( in, in + size * 2, out);
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}
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void FIRMIN::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 FIRMIN::setSamplerate(int _rate)
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{
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samplerate = (float) _rate;
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calc();
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}
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void FIRMIN::setSize(int _size)
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{
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size = _size;
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}
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void FIRMIN::setFreqs(float _f_low, float _f_high)
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{
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f_low = _f_low;
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f_high = _f_high;
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calc();
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}
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} // namespace WDSP
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