kopia lustrzana https://github.com/f4exb/sdrangel
142 wiersze
4.2 KiB
C++
142 wiersze
4.2 KiB
C++
/* delay.c
|
|
|
|
This file is part of a program that implements a Software-Defined Radio.
|
|
|
|
Copyright (C) 2013, 2019 Warren Pratt, NR0V
|
|
Copyright (C) 2024 Edouard Griffiths, F4EXB Adapted to SDRangel
|
|
|
|
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; either version 2
|
|
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 for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program; if not, write to the Free Software
|
|
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
|
|
|
|
The author can be reached by email at
|
|
|
|
warren@wpratt.com
|
|
|
|
*/
|
|
|
|
#include "comm.hpp"
|
|
#include "delay.hpp"
|
|
#include "fir.hpp"
|
|
|
|
namespace WDSP {
|
|
|
|
DELAY* create_delay (int run, int size, float* in, float* out, int rate, float tdelta, float tdelay)
|
|
{
|
|
DELAY *a = new DELAY;
|
|
a->run = run;
|
|
a->size = size;
|
|
a->in = in;
|
|
a->out = out;
|
|
a->rate = rate;
|
|
a->tdelta = tdelta;
|
|
a->tdelay = tdelay;
|
|
a->L = (int)(0.5 + 1.0 / (a->tdelta * (float)a->rate));
|
|
a->adelta = 1.0 / (a->rate * a->L);
|
|
a->ft = 0.45 / (float)a->L;
|
|
a->ncoef = (int)(60.0 / a->ft);
|
|
a->ncoef = (a->ncoef / a->L + 1) * a->L;
|
|
a->cpp = a->ncoef / a->L;
|
|
a->phnum = (int)(0.5 + a->tdelay / a->adelta);
|
|
a->snum = a->phnum / a->L;
|
|
a->phnum %= a->L;
|
|
a->idx_in = 0;
|
|
a->adelay = a->adelta * (a->snum * a->L + a->phnum);
|
|
a->h = FIR::fir_bandpass (a->ncoef,-a->ft, +a->ft, 1.0, 1, 0, (float)a->L);
|
|
a->rsize = a->cpp + (WSDEL - 1);
|
|
a->ring = new float[a->rsize * 2]; // (float *) malloc0 (a->rsize * sizeof (complex));
|
|
return a;
|
|
}
|
|
|
|
void DELAY::destroy_delay (DELAY *a)
|
|
{
|
|
delete[] (a->ring);
|
|
delete[] (a->h);
|
|
delete (a);
|
|
}
|
|
|
|
void DELAY::flush_delay (DELAY *a)
|
|
{
|
|
memset (a->ring, 0, a->cpp * sizeof (wcomplex));
|
|
a->idx_in = 0;
|
|
}
|
|
|
|
void DELAY::xdelay (DELAY *a)
|
|
{
|
|
a->cs_update.lock();
|
|
if (a->run)
|
|
{
|
|
int i, j, k, idx, n;
|
|
float Itmp, Qtmp;
|
|
for (i = 0; i < a->size; i++)
|
|
{
|
|
a->ring[2 * a->idx_in + 0] = a->in[2 * i + 0];
|
|
a->ring[2 * a->idx_in + 1] = a->in[2 * i + 1];
|
|
Itmp = 0.0;
|
|
Qtmp = 0.0;
|
|
if ((n = a->idx_in + a->snum) >= a->rsize) n -= a->rsize;
|
|
for (j = 0, k = a->L - 1 - a->phnum; j < a->cpp; j++, k+= a->L)
|
|
{
|
|
if ((idx = n + j) >= a->rsize) idx -= a->rsize;
|
|
Itmp += a->ring[2 * idx + 0] * a->h[k];
|
|
Qtmp += a->ring[2 * idx + 1] * a->h[k];
|
|
}
|
|
a->out[2 * i + 0] = Itmp;
|
|
a->out[2 * i + 1] = Qtmp;
|
|
if (--a->idx_in < 0) a->idx_in = a->rsize - 1;
|
|
}
|
|
}
|
|
else if (a->out != a->in)
|
|
memcpy (a->out, a->in, a->size * sizeof (wcomplex));
|
|
a->cs_update.unlock();
|
|
}
|
|
|
|
/********************************************************************************************************
|
|
* *
|
|
* Properties *
|
|
* *
|
|
********************************************************************************************************/
|
|
|
|
void DELAY::SetDelayRun (DELAY *a, int run)
|
|
{
|
|
a->cs_update.lock();
|
|
a->run = run;
|
|
a->cs_update.unlock();
|
|
}
|
|
|
|
float DELAY::SetDelayValue (DELAY *a, float tdelay)
|
|
{
|
|
float adelay;
|
|
a->cs_update.lock();
|
|
a->tdelay = tdelay;
|
|
a->phnum = (int)(0.5 + a->tdelay / a->adelta);
|
|
a->snum = a->phnum / a->L;
|
|
a->phnum %= a->L;
|
|
a->adelay = a->adelta * (a->snum * a->L + a->phnum);
|
|
adelay = a->adelay;
|
|
a->cs_update.unlock();
|
|
return adelay;
|
|
}
|
|
|
|
void DELAY::SetDelayBuffs (DELAY *a, int size, float* in, float* out)
|
|
{
|
|
a->cs_update.lock();
|
|
a->size = size;
|
|
a->in = in;
|
|
a->out = out;
|
|
a->cs_update.unlock();
|
|
}
|
|
|
|
} // namespace WDSP
|
|
|