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sdrangel/wdsp/iir.cpp

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/* iir.c
This file is part of a program that implements a Software-Defined Radio.
Copyright (C) 2014, 2022, 2023 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 "iir.hpp"
#include "RXA.hpp"
#include "TXA.hpp"
namespace WDSP {
/********************************************************************************************************
* *
* Bi-Quad Notch *
* *
********************************************************************************************************/
void SNOTCH::calc_snotch (SNOTCH *a)
{
double fn, qk, qr, csn;
fn = a->f / (float)a->rate;
csn = cos (TWOPI * fn);
qr = 1.0 - 3.0 * a->bw;
qk = (1.0 - 2.0 * qr * csn + qr * qr) / (2.0 * (1.0 - csn));
a->a0 = + qk;
a->a1 = - 2.0 * qk * csn;
a->a2 = + qk;
a->b1 = + 2.0 * qr * csn;
a->b2 = - qr * qr;
flush_snotch (a);
}
SNOTCH* SNOTCH::create_snotch (int run, int size, float* in, float* out, int rate, double f, double bw)
{
SNOTCH *a = new SNOTCH;
a->run = run;
a->size = size;
a->in = in;
a->out = out;
a->rate = rate;
a->f = f;
a->bw = bw;
calc_snotch (a);
return a;
}
void SNOTCH::destroy_snotch (SNOTCH *a)
{
delete (a);
}
void SNOTCH::flush_snotch (SNOTCH *a)
{
a->x1 = a->x2 = a->y1 = a->y2 = 0.0;
}
void SNOTCH::xsnotch (SNOTCH *a)
{
if (a->run)
{
int i;
for (i = 0; i < a->size; i++)
{
a->x0 = a->in[2 * i + 0];
a->out[2 * i + 0] = a->a0 * a->x0 + a->a1 * a->x1 + a->a2 * a->x2 + a->b1 * a->y1 + a->b2 * a->y2;
a->y2 = a->y1;
a->y1 = a->out[2 * i + 0];
a->x2 = a->x1;
a->x1 = a->x0;
}
}
else if (a->out != a->in)
{
std::copy( a->in, a->in + a->size * 2, a->out);
}
}
void SNOTCH::setBuffers_snotch (SNOTCH *a, float* in, float* out)
{
a->in = in;
a->out = out;
}
void SNOTCH::setSamplerate_snotch (SNOTCH *a, int rate)
{
a->rate = rate;
calc_snotch (a);
}
void SNOTCH::setSize_snotch (SNOTCH *a, int size)
{
a->size = size;
flush_snotch (a);
}
/********************************************************************************************************
* *
* RXA Properties *
* *
********************************************************************************************************/
void SNOTCH::SetSNCTCSSFreq (SNOTCH *a, double freq)
{
a->f = freq;
calc_snotch (a);
}
void SNOTCH::SetSNCTCSSRun (SNOTCH *a, int run)
{
a->run = run;
}
/********************************************************************************************************
* *
* Complex Bi-Quad Peaking *
* *
********************************************************************************************************/
void SPEAK::calc_speak (SPEAK *a)
{
double ratio;
double f_corr, g_corr, bw_corr, bw_parm, A, f_min;
switch (a->design)
{
case 0:
ratio = a->bw / a->f;
switch (a->nstages)
{
case 4:
bw_parm = 2.4;
f_corr = 1.0 - 0.160 * ratio + 1.440 * ratio * ratio;
g_corr = 1.0 - 1.003 * ratio + 3.990 * ratio * ratio;
break;
default:
bw_parm = 1.0;
f_corr = 1.0;
g_corr = 1.0;
break;
}
{
double fn, qk, qr, csn;
a->fgain = a->gain / g_corr;
fn = a->f / (double)a->rate / f_corr;
csn = cos (TWOPI * fn);
qr = 1.0 - 3.0 * a->bw / (double)a->rate * bw_parm;
qk = (1.0 - 2.0 * qr * csn + qr * qr) / (2.0 * (1.0 - csn));
a->a0 = 1.0 - qk;
a->a1 = 2.0 * (qk - qr) * csn;
a->a2 = qr * qr - qk;
a->b1 = 2.0 * qr * csn;
a->b2 = - qr * qr;
}
break;
case 1:
if (a->f < 200.0) a->f = 200.0;
ratio = a->bw / a->f;
switch (a->nstages)
{
case 4:
bw_parm = 5.0;
bw_corr = 1.13 * ratio - 0.956 * ratio * ratio;
A = 2.5;
f_min = 50.0;
break;
default:
bw_parm = 1.0;
bw_corr = 1.0;
g_corr = 1.0;
A = 2.5;
f_min = 50.0;
break;
}
{
double w0, sn, c, den;
if (a->f < f_min) a->f = f_min;
w0 = TWOPI * a->f / (double)a->rate;
sn = sin (w0);
a->cbw = bw_corr * a->f;
c = sn * sinh(0.5 * log((a->f + 0.5 * a->cbw * bw_parm) / (a->f - 0.5 * a->cbw * bw_parm)) * w0 / sn);
den = 1.0 + c / A;
a->a0 = (1.0 + c * A) / den;
a->a1 = - 2.0 * cos (w0) / den;
a->a2 = (1 - c * A) / den;
a->b1 = - a->a1;
a->b2 = - (1 - c / A ) / den;
a->fgain = a->gain / pow (A * A, (double)a->nstages);
}
break;
}
flush_speak (a);
}
SPEAK* SPEAK::create_speak (
int run,
int size,
float* in,
float* out,
int rate,
double f,
double bw,
double gain,
int nstages,
int design
)
{
SPEAK *a = new SPEAK;
a->run = run;
a->size = size;
a->in = in;
a->out = out;
a->rate = rate;
a->f = f;
a->bw = bw;
a->gain = gain;
a->nstages = nstages;
a->design = design;
a->x0 = new double[a->nstages * 2]; // (float *) malloc0 (a->nstages * sizeof (complex));
a->x1 = new double[a->nstages * 2]; // (float *) malloc0 (a->nstages * sizeof (complex));
a->x2 = new double[a->nstages * 2]; //(float *) malloc0 (a->nstages * sizeof (complex));
a->y0 = new double[a->nstages * 2]; // (float *) malloc0 (a->nstages * sizeof (complex));
a->y1 = new double[a->nstages * 2]; // (float *) malloc0 (a->nstages * sizeof (complex));
a->y2 = new double[a->nstages * 2]; // (float *) malloc0 (a->nstages * sizeof (complex));
calc_speak (a);
return a;
}
void SPEAK::destroy_speak (SPEAK *a)
{
delete[] (a->y2);
delete[] (a->y1);
delete[] (a->y0);
delete[] (a->x2);
delete[] (a->x1);
delete[] (a->x0);
delete (a);
}
void SPEAK::flush_speak (SPEAK *a)
{
int i;
for (i = 0; i < a->nstages; i++)
{
a->x1[2 * i + 0] = a->x2[2 * i + 0] = a->y1[2 * i + 0] = a->y2[2 * i + 0] = 0.0;
a->x1[2 * i + 1] = a->x2[2 * i + 1] = a->y1[2 * i + 1] = a->y2[2 * i + 1] = 0.0;
}
}
void SPEAK::xspeak (SPEAK *a)
{
if (a->run)
{
int i, j, n;
for (i = 0; i < a->size; i++)
{
for (j = 0; j < 2; j++)
{
a->x0[j] = a->fgain * a->in[2 * i + j];
for (n = 0; n < a->nstages; n++)
{
if (n > 0)
a->x0[2 * n + j] = a->y0[2 * (n - 1) + j];
a->y0[2 * n + j] = a->a0 * a->x0[2 * n + j]
+ a->a1 * a->x1[2 * n + j]
+ a->a2 * a->x2[2 * n + j]
+ a->b1 * a->y1[2 * n + j]
+ a->b2 * a->y2[2 * n + j];
a->y2[2 * n + j] = a->y1[2 * n + j];
a->y1[2 * n + j] = a->y0[2 * n + j];
a->x2[2 * n + j] = a->x1[2 * n + j];
a->x1[2 * n + j] = a->x0[2 * n + j];
}
a->out[2 * i + j] = a->y0[2 * (a->nstages - 1) + j];
}
}
}
else if (a->out != a->in)
{
std::copy( a->in, a->in + a->size * 2, a->out);
}
}
void SPEAK::setBuffers_speak (SPEAK *a, float* in, float* out)
{
a->in = in;
a->out = out;
}
void SPEAK::setSamplerate_speak (SPEAK *a, int rate)
{
a->rate = rate;
calc_speak (a);
}
void SPEAK::setSize_speak (SPEAK *a, int size)
{
a->size = size;
flush_speak (a);
}
/********************************************************************************************************
* *
* RXA Properties *
* *
********************************************************************************************************/
void SPEAK::SetSPCWRun (RXA& rxa, int run)
{
SPEAK *a = rxa.speak;
a->run = run;
}
void SPEAK::SetSPCWFreq (RXA& rxa, double freq)
{
SPEAK *a = rxa.speak;
a->f = freq;
calc_speak (a);
}
void SPEAK::SetSPCWBandwidth (RXA& rxa, double bw)
{
SPEAK *a = rxa.speak;
a->bw = bw;
calc_speak (a);
}
void SPEAK::SetSPCWGain (RXA& rxa, double gain)
{
SPEAK *a = rxa.speak;
a->gain = gain;
calc_speak (a);
}
/********************************************************************************************************
* *
* Complex Multiple Peaking *
* *
********************************************************************************************************/
void MPEAK::calc_mpeak (MPEAK *a)
{
int i;
a->tmp = new float[a->size * 2]; // (float *) malloc0 (a->size * sizeof (complex));
a->mix = new float[a->size * 2]; // (float *) malloc0 (a->size * sizeof (complex));
for (i = 0; i < a->npeaks; i++)
{
a->pfil[i] = SPEAK::create_speak (
1,
a->size,
a->in,
a->tmp,
a->rate,
a->f[i],
a->bw[i],
a->gain[i],
a->nstages,
1
);
}
}
void MPEAK::decalc_mpeak (MPEAK *a)
{
int i;
for (i = 0; i < a->npeaks; i++)
SPEAK::destroy_speak (a->pfil[i]);
delete[] (a->mix);
delete[] (a->tmp);
}
MPEAK* MPEAK::create_mpeak (
int run,
int size,
float* in,
float* out,
int rate,
int npeaks,
int* enable,
double* f,
double* bw,
double* gain,
int nstages
)
{
MPEAK *a = new MPEAK;
a->run = run;
a->size = size;
a->in = in;
a->out = out;
a->rate = rate;
a->npeaks = npeaks;
a->nstages = nstages;
a->enable = new int[a->npeaks]; // (int *) malloc0 (a->npeaks * sizeof (int));
a->f = new double[a->npeaks]; // (float *) malloc0 (a->npeaks * sizeof (float));
a->bw = new double[a->npeaks]; // (float *) malloc0 (a->npeaks * sizeof (float));
a->gain = new double[a->npeaks]; // (float *) malloc0 (a->npeaks * sizeof (float));
memcpy (a->enable, enable, a->npeaks * sizeof (int));
memcpy (a->f, f, a->npeaks * sizeof (double));
memcpy (a->bw, bw, a->npeaks * sizeof (double));
memcpy (a->gain, gain, a->npeaks * sizeof (double));
a->pfil = new SPEAK*[a->npeaks]; // (SPEAK *) malloc0 (a->npeaks * sizeof (SPEAK));
calc_mpeak (a);
return a;
}
void MPEAK::destroy_mpeak (MPEAK *a)
{
decalc_mpeak (a);
delete[] (a->pfil);
delete[] (a->gain);
delete[] (a->bw);
delete[] (a->f);
delete[] (a->enable);
delete (a);
}
void MPEAK::flush_mpeak (MPEAK *a)
{
int i;
for (i = 0; i < a->npeaks; i++)
SPEAK::flush_speak (a->pfil[i]);
}
void MPEAK::xmpeak (MPEAK *a)
{
if (a->run)
{
int i, j;
std::fill(a->mix, a->mix + a->size * 2, 0);
for (i = 0; i < a->npeaks; i++)
{
if (a->enable[i])
{
SPEAK::xspeak (a->pfil[i]);
for (j = 0; j < 2 * a->size; j++)
a->mix[j] += a->tmp[j];
}
}
std::copy(a->mix, a->mix + a->size * 2, a->out);
}
else if (a->in != a->out)
{
std::copy( a->in, a->in + a->size * 2, a->out);
}
}
void MPEAK::setBuffers_mpeak (MPEAK *a, float* in, float* out)
{
decalc_mpeak (a);
a->in = in;
a->out = out;
calc_mpeak (a);
}
void MPEAK::setSamplerate_mpeak (MPEAK *a, int rate)
{
decalc_mpeak (a);
a->rate = rate;
calc_mpeak (a);
}
void MPEAK::setSize_mpeak (MPEAK *a, int size)
{
decalc_mpeak (a);
a->size = size;
calc_mpeak (a);
}
/********************************************************************************************************
* *
* RXA Properties *
* *
********************************************************************************************************/
void MPEAK::SetmpeakRun (RXA& rxa, int run)
{
MPEAK *a = rxa.mpeak;
a->run = run;
}
void MPEAK::SetmpeakNpeaks (RXA& rxa, int npeaks)
{
MPEAK *a = rxa.mpeak;
a->npeaks = npeaks;
}
void MPEAK::SetmpeakFilEnable (RXA& rxa, int fil, int enable)
{
MPEAK *a = rxa.mpeak;
a->enable[fil] = enable;
}
void MPEAK::SetmpeakFilFreq (RXA& rxa, int fil, double freq)
{
MPEAK *a = rxa.mpeak;
a->f[fil] = freq;
a->pfil[fil]->f = freq;
SPEAK::calc_speak(a->pfil[fil]);
}
void MPEAK::SetmpeakFilBw (RXA& rxa, int fil, double bw)
{
MPEAK *a = rxa.mpeak;
a->bw[fil] = bw;
a->pfil[fil]->bw = bw;
SPEAK::calc_speak(a->pfil[fil]);
}
void MPEAK::SetmpeakFilGain (RXA& rxa, int fil, double gain)
{
MPEAK *a = rxa.mpeak;
a->gain[fil] = gain;
a->pfil[fil]->gain = gain;
SPEAK::calc_speak(a->pfil[fil]);
}
/********************************************************************************************************
* *
* Phase Rotator *
* *
********************************************************************************************************/
void PHROT::calc_phrot (PHROT *a)
{
double g;
a->x0 = new double[a->nstages]; // (float *) malloc0 (a->nstages * sizeof (float));
a->x1 = new double[a->nstages]; // (float *) malloc0 (a->nstages * sizeof (float));
a->y0 = new double[a->nstages]; // (float *) malloc0 (a->nstages * sizeof (float));
a->y1 = new double[a->nstages]; // (float *) malloc0 (a->nstages * sizeof (float));
g = tan (PI * a->fc / (float)a->rate);
a->b0 = (g - 1.0) / (g + 1.0);
a->b1 = 1.0;
a->a1 = a->b0;
}
void PHROT::decalc_phrot (PHROT *a)
{
delete[] (a->y1);
delete[] (a->y0);
delete[] (a->x1);
delete[] (a->x0);
}
PHROT* PHROT::create_phrot (int run, int size, float* in, float* out, int rate, double fc, int nstages)
{
PHROT *a = new PHROT;
a->reverse = 0;
a->run = run;
a->size = size;
a->in = in;
a->out = out;
a->rate = rate;
a->fc = fc;
a->nstages = nstages;
calc_phrot (a);
return a;
}
void PHROT::destroy_phrot (PHROT *a)
{
decalc_phrot (a);
delete (a);
}
void PHROT::flush_phrot (PHROT *a)
{
memset (a->x0, 0, a->nstages * sizeof (double));
memset (a->x1, 0, a->nstages * sizeof (double));
memset (a->y0, 0, a->nstages * sizeof (double));
memset (a->y1, 0, a->nstages * sizeof (double));
}
void PHROT::xphrot (PHROT *a)
{
if (a->reverse)
{
for (int i = 0; i < a->size; i++)
a->in[2 * i + 0] = -a->in[2 * i + 0];
}
if (a->run)
{
int i, n;
for (i = 0; i < a->size; i++)
{
a->x0[0] = a->in[2 * i + 0];
for (n = 0; n < a->nstages; n++)
{
if (n > 0) a->x0[n] = a->y0[n - 1];
a->y0[n] = a->b0 * a->x0[n]
+ a->b1 * a->x1[n]
- a->a1 * a->y1[n];
a->y1[n] = a->y0[n];
a->x1[n] = a->x0[n];
}
a->out[2 * i + 0] = a->y0[a->nstages - 1];
}
}
else if (a->out != a->in)
{
std::copy( a->in, a->in + a->size * 2, a->out);
}
}
void PHROT::setBuffers_phrot (PHROT *a, float* in, float* out)
{
a->in = in;
a->out = out;
}
void PHROT::setSamplerate_phrot (PHROT *a, int rate)
{
decalc_phrot (a);
a->rate = rate;
calc_phrot (a);
}
void PHROT::setSize_phrot (PHROT *a, int size)
{
a->size = size;
flush_phrot (a);
}
/********************************************************************************************************
* *
* TXA Properties *
* *
********************************************************************************************************/
void PHROT::SetPHROTRun (TXA& txa, int run)
{
PHROT *a = txa.phrot;
a->run = run;
if (a->run)
flush_phrot (a);
}
void PHROT::SetPHROTCorner (TXA& txa, double corner)
{
PHROT *a = txa.phrot;
decalc_phrot (a);
a->fc = corner;
calc_phrot (a);
}
void PHROT::SetPHROTNstages (TXA& txa, int nstages)
{
PHROT *a = txa.phrot;
decalc_phrot (a);
a->nstages = nstages;
calc_phrot (a);
}
void PHROT::SetPHROTReverse (TXA& txa, int reverse)
{
PHROT *a = txa.phrot;
a->reverse = reverse;
}
/********************************************************************************************************
* *
* Complex Bi-Quad Low-Pass *
* *
********************************************************************************************************/
void BQLP::calc_bqlp(BQLP *a)
{
double w0, cs, c, den;
w0 = TWOPI * a->fc / (double)a->rate;
cs = cos(w0);
c = sin(w0) / (2.0 * a->Q);
den = 1.0 + c;
a->a0 = 0.5 * (1.0 - cs) / den;
a->a1 = (1.0 - cs) / den;
a->a2 = 0.5 * (1.0 - cs) / den;
a->b1 = 2.0 * cs / den;
a->b2 = (c - 1.0) / den;
flush_bqlp(a);
}
BQLP* BQLP::create_bqlp(int run, int size, float* in, float* out, double rate, double fc, double Q, double gain, int nstages)
{
BQLP *a = new BQLP;
a->run = run;
a->size = size;
a->in = in;
a->out = out;
a->rate = rate;
a->fc = fc;
a->Q = Q;
a->gain = gain;
a->nstages = nstages;
a->x0 = new double[a->nstages * 2]; // (float*)malloc0(a->nstages * sizeof(complex));
a->x1 = new double[a->nstages * 2]; // (float*)malloc0(a->nstages * sizeof(complex));
a->x2 = new double[a->nstages * 2]; // (float*)malloc0(a->nstages * sizeof(complex));
a->y0 = new double[a->nstages * 2]; // (float*)malloc0(a->nstages * sizeof(complex));
a->y1 = new double[a->nstages * 2]; // (float*)malloc0(a->nstages * sizeof(complex));
a->y2 = new double[a->nstages * 2]; // (float*)malloc0(a->nstages * sizeof(complex));
calc_bqlp(a);
return a;
}
void BQLP::destroy_bqlp(BQLP *a)
{
delete[](a->y2);
delete[](a->y1);
delete[](a->y0);
delete[](a->x2);
delete[](a->x1);
delete[](a->x0);
delete(a);
}
void BQLP::flush_bqlp(BQLP *a)
{
int i;
for (i = 0; i < a->nstages; i++)
{
a->x1[2 * i + 0] = a->x2[2 * i + 0] = a->y1[2 * i + 0] = a->y2[2 * i + 0] = 0.0;
a->x1[2 * i + 1] = a->x2[2 * i + 1] = a->y1[2 * i + 1] = a->y2[2 * i + 1] = 0.0;
}
}
void BQLP::xbqlp(BQLP *a)
{
if (a->run)
{
int i, j, n;
for (i = 0; i < a->size; i++)
{
for (j = 0; j < 2; j++)
{
a->x0[j] = a->gain * a->in[2 * i + j];
for (n = 0; n < a->nstages; n++)
{
if (n > 0)
a->x0[2 * n + j] = a->y0[2 * (n - 1) + j];
a->y0[2 * n + j] = a->a0 * a->x0[2 * n + j]
+ a->a1 * a->x1[2 * n + j]
+ a->a2 * a->x2[2 * n + j]
+ a->b1 * a->y1[2 * n + j]
+ a->b2 * a->y2[2 * n + j];
a->y2[2 * n + j] = a->y1[2 * n + j];
a->y1[2 * n + j] = a->y0[2 * n + j];
a->x2[2 * n + j] = a->x1[2 * n + j];
a->x1[2 * n + j] = a->x0[2 * n + j];
}
a->out[2 * i + j] = a->y0[2 * (a->nstages - 1) + j];
}
}
}
else if (a->out != a->in)
{
std::copy(a->in, a->in + a->size * 2, a->out);
}
}
void BQLP::setBuffers_bqlp(BQLP *a, float* in, float* out)
{
a->in = in;
a->out = out;
}
void BQLP::setSamplerate_bqlp(BQLP *a, int rate)
{
a->rate = rate;
calc_bqlp(a);
}
void BQLP::setSize_bqlp(BQLP *a, int size)
{
a->size = size;
flush_bqlp(a);
}
/********************************************************************************************************
* *
* Double Bi-Quad Low-Pass *
* *
********************************************************************************************************/
void DBQLP::calc_dbqlp(BQLP *a)
{
float w0, cs, c, den;
w0 = TWOPI * a->fc / (float)a->rate;
cs = cos(w0);
c = sin(w0) / (2.0 * a->Q);
den = 1.0 + c;
a->a0 = 0.5 * (1.0 - cs) / den;
a->a1 = (1.0 - cs) / den;
a->a2 = 0.5 * (1.0 - cs) / den;
a->b1 = 2.0 * cs / den;
a->b2 = (c - 1.0) / den;
flush_dbqlp(a);
}
BQLP* DBQLP::create_dbqlp(int run, int size, float* in, float* out, double rate, double fc, double Q, double gain, int nstages)
{
BQLP *a = new BQLP;
a->run = run;
a->size = size;
a->in = in;
a->out = out;
a->rate = rate;
a->fc = fc;
a->Q = Q;
a->gain = gain;
a->nstages = nstages;
a->x0 = new double[a->nstages]; // (float*)malloc0(a->nstages * sizeof(float));
a->x1 = new double[a->nstages]; // (float*)malloc0(a->nstages * sizeof(float));
a->x2 = new double[a->nstages]; // (float*)malloc0(a->nstages * sizeof(float));
a->y0 = new double[a->nstages]; // (float*)malloc0(a->nstages * sizeof(float));
a->y1 = new double[a->nstages]; // (float*)malloc0(a->nstages * sizeof(float));
a->y2 = new double[a->nstages]; // (float*)malloc0(a->nstages * sizeof(float));
calc_dbqlp(a);
return a;
}
void DBQLP::destroy_dbqlp(BQLP *a)
{
delete[](a->y2);
delete[](a->y1);
delete[](a->y0);
delete[](a->x2);
delete[](a->x1);
delete[](a->x0);
delete(a);
}
void DBQLP::flush_dbqlp(BQLP *a)
{
int i;
for (i = 0; i < a->nstages; i++)
{
a->x1[i] = a->x2[i] = a->y1[i] = a->y2[i] = 0.0;
}
}
void DBQLP::xdbqlp(BQLP *a)
{
if (a->run)
{
int i, n;
for (i = 0; i < a->size; i++)
{
a->x0[0] = a->gain * a->in[i];
for (n = 0; n < a->nstages; n++)
{
if (n > 0)
a->x0[n] = a->y0[n - 1];
a->y0[n] = a->a0 * a->x0[n]
+ a->a1 * a->x1[n]
+ a->a2 * a->x2[n]
+ a->b1 * a->y1[n]
+ a->b2 * a->y2[n];
a->y2[n] = a->y1[n];
a->y1[n] = a->y0[n];
a->x2[n] = a->x1[n];
a->x1[n] = a->x0[n];
}
a->out[i] = a->y0[a->nstages - 1];
}
}
else if (a->out != a->in)
{
memcpy(a->out, a->in, a->size * sizeof(float));
}
}
void DBQLP::setBuffers_dbqlp(BQLP *a, float* in, float* out)
{
a->in = in;
a->out = out;
}
void DBQLP::setSamplerate_dbqlp(BQLP *a, int rate)
{
a->rate = rate;
calc_dbqlp(a);
}
void DBQLP::setSize_dbqlp(BQLP *a, int size)
{
a->size = size;
flush_dbqlp(a);
}
/********************************************************************************************************
* *
* Complex Bi-Quad Band-Pass *
* *
********************************************************************************************************/
void BQBP::calc_bqbp(BQBP *a)
{
double f0, w0, bw, q, sn, cs, c, den;
bw = a->f_high - a->f_low;
f0 = (a->f_high + a->f_low) / 2.0;
q = f0 / bw;
w0 = TWOPI * f0 / a->rate;
sn = sin(w0);
cs = cos(w0);
c = sn / (2.0 * q);
den = 1.0 + c;
a->a0 = +c / den;
a->a1 = 0.0;
a->a2 = -c / den;
a->b1 = 2.0 * cs / den;
a->b2 = (c - 1.0) / den;
flush_bqbp(a);
}
BQBP* BQBP::create_bqbp(int run, int size, float* in, float* out, double rate, double f_low, double f_high, double gain, int nstages)
{
BQBP *a = new BQBP;
a->run = run;
a->size = size;
a->in = in;
a->out = out;
a->rate = rate;
a->f_low = f_low;
a->f_high = f_high;
a->gain = gain;
a->nstages = nstages;
a->x0 = new double[a->nstages * 2]; // (float*)malloc0(a->nstages * sizeof(complex));
a->x1 = new double[a->nstages * 2]; // (float*)malloc0(a->nstages * sizeof(complex));
a->x2 = new double[a->nstages * 2]; // (float*)malloc0(a->nstages * sizeof(complex));
a->y0 = new double[a->nstages * 2]; // (float*)malloc0(a->nstages * sizeof(complex));
a->y1 = new double[a->nstages * 2]; // (float*)malloc0(a->nstages * sizeof(complex));
a->y2 = new double[a->nstages * 2]; // (float*)malloc0(a->nstages * sizeof(complex));
calc_bqbp(a);
return a;
}
void BQBP::destroy_bqbp(BQBP *a)
{
delete[](a->y2);
delete[](a->y1);
delete[](a->y0);
delete[](a->x2);
delete[](a->x1);
delete[](a->x0);
delete(a);
}
void BQBP::flush_bqbp(BQBP *a)
{
int i;
for (i = 0; i < a->nstages; i++)
{
a->x1[2 * i + 0] = a->x2[2 * i + 0] = a->y1[2 * i + 0] = a->y2[2 * i + 0] = 0.0;
a->x1[2 * i + 1] = a->x2[2 * i + 1] = a->y1[2 * i + 1] = a->y2[2 * i + 1] = 0.0;
}
}
void BQBP::xbqbp(BQBP *a)
{
if (a->run)
{
int i, j, n;
for (i = 0; i < a->size; i++)
{
for (j = 0; j < 2; j++)
{
a->x0[j] = a->gain * a->in[2 * i + j];
for (n = 0; n < a->nstages; n++)
{
if (n > 0)
a->x0[2 * n + j] = a->y0[2 * (n - 1) + j];
a->y0[2 * n + j] = a->a0 * a->x0[2 * n + j]
+ a->a1 * a->x1[2 * n + j]
+ a->a2 * a->x2[2 * n + j]
+ a->b1 * a->y1[2 * n + j]
+ a->b2 * a->y2[2 * n + j];
a->y2[2 * n + j] = a->y1[2 * n + j];
a->y1[2 * n + j] = a->y0[2 * n + j];
a->x2[2 * n + j] = a->x1[2 * n + j];
a->x1[2 * n + j] = a->x0[2 * n + j];
}
a->out[2 * i + j] = a->y0[2 * (a->nstages - 1) + j];
}
}
}
else if (a->out != a->in)
{
std::copy(a->in, a->in + a->size * 2, a->out);
}
}
void BQBP::setBuffers_bqbp(BQBP *a, float* in, float* out)
{
a->in = in;
a->out = out;
}
void BQBP::setSamplerate_bqbp(BQBP *a, int rate)
{
a->rate = rate;
calc_bqbp(a);
}
void BQBP::setSize_bqbp(BQBP *a, int size)
{
a->size = size;
flush_bqbp(a);
}
/********************************************************************************************************
* *
* Double Bi-Quad Band-Pass *
* *
********************************************************************************************************/
void BQBP::calc_dbqbp(BQBP *a)
{
double f0, w0, bw, q, sn, cs, c, den;
bw = a->f_high - a->f_low;
f0 = (a->f_high + a->f_low) / 2.0;
q = f0 / bw;
w0 = TWOPI * f0 / a->rate;
sn = sin(w0);
cs = cos(w0);
c = sn / (2.0 * q);
den = 1.0 + c;
a->a0 = +c / den;
a->a1 = 0.0;
a->a2 = -c / den;
a->b1 = 2.0 * cs / den;
a->b2 = (c - 1.0) / den;
flush_dbqbp(a);
}
BQBP* BQBP::create_dbqbp(int run, int size, float* in, float* out, double rate, double f_low, double f_high, double gain, int nstages)
{
BQBP *a = new BQBP;
a->run = run;
a->size = size;
a->in = in;
a->out = out;
a->rate = rate;
a->f_low = f_low;
a->f_high = f_high;
a->gain = gain;
a->nstages = nstages;
a->x0 = new double[a->nstages]; // (float*)malloc0(a->nstages * sizeof(float));
a->x1 = new double[a->nstages]; // (float*)malloc0(a->nstages * sizeof(float));
a->x2 = new double[a->nstages]; // (float*)malloc0(a->nstages * sizeof(float));
a->y0 = new double[a->nstages]; // (float*)malloc0(a->nstages * sizeof(float));
a->y1 = new double[a->nstages]; // (float*)malloc0(a->nstages * sizeof(float));
a->y2 = new double[a->nstages]; // (float*)malloc0(a->nstages * sizeof(float));
calc_dbqbp(a);
return a;
}
void BQBP::destroy_dbqbp(BQBP *a)
{
delete[](a->y2);
delete[](a->y1);
delete[](a->y0);
delete[](a->x2);
delete[](a->x1);
delete[](a->x0);
delete(a);
}
void BQBP::flush_dbqbp(BQBP *a)
{
int i;
for (i = 0; i < a->nstages; i++)
{
a->x1[i] = a->x2[i] = a->y1[i] = a->y2[i] = 0.0;
}
}
void BQBP::xdbqbp(BQBP *a)
{
if (a->run)
{
int i, n;
for (i = 0; i < a->size; i++)
{
a->x0[0] = a->gain * a->in[i];
for (n = 0; n < a->nstages; n++)
{
if (n > 0)
a->x0[n] = a->y0[n - 1];
a->y0[n] = a->a0 * a->x0[n]
+ a->a1 * a->x1[n]
+ a->a2 * a->x2[n]
+ a->b1 * a->y1[n]
+ a->b2 * a->y2[n];
a->y2[n] = a->y1[n];
a->y1[n] = a->y0[n];
a->x2[n] = a->x1[n];
a->x1[n] = a->x0[n];
}
a->out[i] = a->y0[a->nstages - 1];
}
}
else if (a->out != a->in)
{
memcpy(a->out, a->in, a->size * sizeof(float));
}
}
void BQBP::setBuffers_dbqbp(BQBP *a, float* in, float* out)
{
a->in = in;
a->out = out;
}
void BQBP::setSamplerate_dbqbp(BQBP *a, int rate)
{
a->rate = rate;
calc_dbqbp(a);
}
void BQBP::setSize_dbqbp(BQBP *a, int size)
{
a->size = size;
flush_dbqbp(a);
}
/********************************************************************************************************
* *
* Complex Single-Pole High-Pass *
* *
********************************************************************************************************/
void SPHP::calc_sphp(SPHP *a)
{
double g;
a->x0 = new double[a->nstages * 2]; // (float*)malloc0(a->nstages * sizeof(complex));
a->x1 = new double[a->nstages * 2]; // (float*)malloc0(a->nstages * sizeof(complex));
a->y0 = new double[a->nstages * 2]; // (float*)malloc0(a->nstages * sizeof(complex));
a->y1 = new double[a->nstages * 2]; // (float*)malloc0(a->nstages * sizeof(complex));
g = exp(-TWOPI * a->fc / a->rate);
a->b0 = +0.5 * (1.0 + g);
a->b1 = -0.5 * (1.0 + g);
a->a1 = -g;
}
SPHP* SPHP::create_sphp(int run, int size, float* in, float* out, double rate, double fc, int nstages)
{
SPHP *a = new SPHP;
a->run = run;
a->size = size;
a->in = in;
a->out = out;
a->rate = rate;
a->fc = fc;
a->nstages = nstages;
calc_sphp(a);
return a;
}
void SPHP::decalc_sphp(SPHP *a)
{
delete[](a->y1);
delete[](a->y0);
delete[](a->x1);
delete[](a->x0);
}
void SPHP::destroy_sphp(SPHP *a)
{
decalc_sphp(a);
delete(a);
}
void SPHP::flush_sphp(SPHP *a)
{
std::fill(a->x0, a->x0 + a->nstages * 2, 0);
std::fill(a->x1, a->x0 + a->nstages * 2, 0);
std::fill(a->y0, a->x0 + a->nstages * 2, 0);
std::fill(a->y1, a->x0 + a->nstages * 2, 0);
}
void SPHP::xsphp(SPHP *a)
{
if (a->run)
{
int i, j, n;
for (i = 0; i < a->size; i++)
{
for (j = 0; j < 2; j++)
{
a->x0[j] = a->in[2 * i + j];
for (n = 0; n < a->nstages; n++)
{
if (n > 0)
a->x0[2 * n + j] = a->y0[2 * (n - 1) + j];
a->y0[2 * n + j] = a->b0 * a->x0[2 * n + j]
+ a->b1 * a->x1[2 * n + j]
- a->a1 * a->y1[2 * n + j];
a->y1[2 * n + j] = a->y0[2 * n + j];
a->x1[2 * n + j] = a->x0[2 * n + j];
}
a->out[2 * i + j] = a->y0[2 * (a->nstages - 1) + j];
}
}
}
else if (a->out != a->in)
{
std::copy(a->in, a->in + a->size * 2, a->out);
}
}
void SPHP::setBuffers_sphp(SPHP *a, float* in, float* out)
{
a->in = in;
a->out = out;
}
void SPHP::setSamplerate_sphp(SPHP *a, int rate)
{
decalc_sphp(a);
a->rate = rate;
calc_sphp(a);
}
void SPHP::setSize_sphp(SPHP *a, int size)
{
a->size = size;
flush_sphp(a);
}
/********************************************************************************************************
* *
* Double Single-Pole High-Pass *
* *
********************************************************************************************************/
void SPHP::calc_dsphp(SPHP *a)
{
double g;
a->x0 = new double[a->nstages]; // (float*)malloc0(a->nstages * sizeof(float));
a->x1 = new double[a->nstages]; // (float*)malloc0(a->nstages * sizeof(float));
a->y0 = new double[a->nstages]; // (float*)malloc0(a->nstages * sizeof(float));
a->y1 = new double[a->nstages]; // (float*)malloc0(a->nstages * sizeof(float));
g = exp(-TWOPI * a->fc / a->rate);
a->b0 = +0.5 * (1.0 + g);
a->b1 = -0.5 * (1.0 + g);
a->a1 = -g;
}
SPHP* SPHP::create_dsphp(int run, int size, float* in, float* out, double rate, double fc, int nstages)
{
SPHP *a = new SPHP;
a->run = run;
a->size = size;
a->in = in;
a->out = out;
a->rate = rate;
a->fc = fc;
a->nstages = nstages;
calc_dsphp(a);
return a;
}
void SPHP::decalc_dsphp(SPHP *a)
{
delete[](a->y1);
delete[](a->y0);
delete[](a->x1);
delete[](a->x0);
}
void SPHP::destroy_dsphp(SPHP *a)
{
decalc_dsphp(a);
delete(a);
}
void SPHP::flush_dsphp(SPHP *a)
{
memset(a->x0, 0, a->nstages * sizeof(float));
memset(a->x1, 0, a->nstages * sizeof(float));
memset(a->y0, 0, a->nstages * sizeof(float));
memset(a->y1, 0, a->nstages * sizeof(float));
}
void SPHP::xdsphp(SPHP *a)
{
if (a->run)
{
int i, n;
for (i = 0; i < a->size; i++)
{
a->x0[0] = a->in[i];
for (n = 0; n < a->nstages; n++)
{
if (n > 0)
a->x0[n] = a->y0[n - 1];
a->y0[n] = a->b0 * a->x0[n]
+ a->b1 * a->x1[n]
- a->a1 * a->y1[n];
a->y1[n] = a->y0[n];
a->x1[n] = a->x0[n];
}
a->out[i] = a->y0[a->nstages - 1];
}
}
else if (a->out != a->in)
{
memcpy(a->out, a->in, a->size * sizeof(float));
}
}
void SPHP::setBuffers_dsphp(SPHP *a, float* in, float* out)
{
a->in = in;
a->out = out;
}
void SPHP::setSamplerate_dsphp(SPHP *a, int rate)
{
decalc_dsphp(a);
a->rate = rate;
calc_dsphp(a);
}
void SPHP::setSize_dsphp(SPHP *a, int size)
{
a->size = size;
flush_dsphp(a);
}
} // namespace WDSP
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