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/*
Eq.cc
Copyright 2002-5 Tim Goetze <tim@quitte.de>
http://quitte.de/dsp/
10-band octave-spread equalizer.
*/
/*
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., 59 Temple Place - Suite 330, Boston, MA
02111-1307, USA or point your web browser to http://www.gnu.org.
*/
#include "basics.h"
#include <stdio.h>
#include "Eq.h"
#include "Descriptor.h"
void
Eq::init (double _fs)
{
fs = _fs;
eq.init (fs, 1.2);
normal = NOISE_FLOOR;
}
inline static double
adjust_gain (int i, double g)
{
static float adjust[] = {
0.69238604707174034, 0.67282771124180096,
0.67215187672467813, 0.65768648447259315,
0.65988083755898952, 0.66359580101701909,
0.66485139160960427, 0.65890297086039662,
0.6493229390740376, 0.82305724539749325
};
return g * adjust[i];
}
void
Eq::activate()
{
for (int i = 0; i < 10; ++i)
{
gain[i] = *ports [1 + i];
eq.gain[i] = adjust_gain (i, DSP::db2lin (gain[i]));
}
}
template <sample_func_t F>
void
Eq::one_cycle (int frames)
{
d_sample * s = ports[0];
/* evaluate band gain changes and compute recursion factor to prevent
* zipper noise */
double one_over_n = 1. / frames;
for (int i = 0; i < 10; ++i)
{
if (*ports [1 + i] == gain[i])
{
/* no gain factoring */
eq.gf[i] = 1;
continue;
}
gain[i] = *ports [1 + i];
double want = adjust_gain (i, DSP::db2lin (gain[i]));
eq.gf[i] = pow (want / eq.gain[i], one_over_n);
}
d_sample * d = ports[11];
for (int i = 0; i < frames; ++i)
F (d, i, eq.process (s[i] + normal), adding_gain);
normal = -normal;
}
/* //////////////////////////////////////////////////////////////////////// */
PortInfo
Eq::port_info [] =
{
{
"in",
INPUT | AUDIO,
{0, -1, 1}
}, {
"31 Hz",
INPUT | CONTROL,
{BOUNDED | DEFAULT_0, -48, 30}
}, {
"63 Hz",
INPUT | CONTROL,
{BOUNDED | DEFAULT_0, -48, 30}
}, {
"125 Hz",
INPUT | CONTROL,
{BOUNDED | DEFAULT_0, -48, 30}
}, {
"250 Hz",
INPUT | CONTROL,
{BOUNDED | DEFAULT_0, -48, 30}
}, {
"500 Hz",
INPUT | CONTROL,
{BOUNDED | DEFAULT_0, -48, 30}
}, {
"1 kHz",
INPUT | CONTROL,
{BOUNDED | DEFAULT_0, -48, 30}
}, {
"2 kHz",
INPUT | CONTROL,
{BOUNDED | DEFAULT_0, -48, 30}
}, {
"4 kHz",
INPUT | CONTROL,
{BOUNDED | DEFAULT_0, -48, 30}
}, {
"8 kHz",
INPUT | CONTROL,
{BOUNDED | DEFAULT_0, -48, 30}
}, {
"16 kHz",
INPUT | CONTROL,
{BOUNDED | DEFAULT_0, -48, 30}
}, {
"out",
OUTPUT | AUDIO,
{0}
}
};
template <> void
Descriptor<Eq>::setup()
{
UniqueID = 1773;
Label = "Eq";
Properties = HARD_RT;
Name = "CAPS: Eq - 10-band 'analogue' equalizer";
Maker = "Tim Goetze <tim@quitte.de>";
Copyright = "GPL, 2004-5";
/* fill port info and vtable */
autogen();
}
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