1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244
|
/*
Preamp.cc
Copyright 2003-7 Tim Goetze <tim@quitte.de>
http://quitte.de/dsp/
Loosely 12AX7-based tube preamp model with 8x oversampling.
*/
/*
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 "Amp.h"
#include "Descriptor.h"
void
PreampIII::init()
{
this->AmpStub::init();
DSP::RBJ::LoShelve (200 / fs, .2, -6, filter.a, filter.b);
}
template <sample_func_t F, int OVERSAMPLE>
void
PreampIII::one_cycle (int frames)
{
d_sample * s = ports[0];
d_sample gain = getport(1);
d_sample temp = getport(2) * tube.scale;
d_sample * d = ports[3];
*ports[4] = OVERSAMPLE;
double g = current.g;
current.g = max (gain < 1 ? gain : exp2 (gain - 1), .000001);
/* correction for attenuated first transfer */
current.g *= tube.scale / fabs (tube.transfer (temp));
if (g == 0) g = current.g;
/* recursive fade to prevent zipper noise from the 'gain' knob */
double one_over_n = frames > 0 ? 1. / frames : 1;
double gf = pow (current.g / g, one_over_n);
for (int i = 0; i < frames; ++i)
{
register d_sample a = s[i] + normal;
a = g * tube.transfer (a * temp);
a = filter.process (a);
a = down.process (tube.transfer_clip (up.upsample (a)));
for (int o = 1; o < OVERSAMPLE; ++o)
down.store (tube.transfer_clip (up.pad (o)));
F (d, i, dc_blocker.process (a), adding_gain);
g *= gf;
}
current.g = g;
}
/* //////////////////////////////////////////////////////////////////////// */
PortInfo
PreampIII::port_info [] =
{
{
"in",
INPUT | AUDIO,
{BOUNDED, -1, 1}
}, {
"gain",
INPUT | CONTROL,
{BOUNDED | DEFAULT_1, 0, 10}
}, {
"temperature",
INPUT | CONTROL,
{BOUNDED | DEFAULT_LOW, 0.005, 1}
}, {
"out",
OUTPUT | AUDIO,
{0}
}, {
"latency",
OUTPUT | CONTROL,
{0}
}
};
template <> void
Descriptor<PreampIII>::setup()
{
UniqueID = 1776;
Label = "PreampIII";
Properties = HARD_RT;
Name = CAPS "PreampIII - Tube preamp emulation";
Maker = "Tim Goetze <tim@quitte.de>";
Copyright = "GPL, 2002-7";
/* fill port info and vtable */
autogen();
}
/* //////////////////////////////////////////////////////////////////////// */
void
PreampIV::init()
{
this->AmpStub::init();
tone.init (fs);
}
void
PreampIV::activate()
{
this->PreampIII::activate();
tone.activate (ports + 3);
}
template <sample_func_t F, int OVERSAMPLE>
void
PreampIV::one_cycle (int frames)
{
double one_over_n = frames > 0 ? 1. / frames : 1;
d_sample * s = ports[0];
d_sample gain = getport(1);
d_sample temp = getport(2) * tube.scale;
tone.start_cycle (ports + 3, one_over_n);
d_sample * d = ports[7];
*ports[8] = OVERSAMPLE;
double g = current.g;
current.g = max (gain < 1 ? gain : exp2 (gain - 1), .000001);
current.g *= tube.scale / fabs (tube.transfer (temp));
if (g == 0) g = current.g;
/* recursive fade to prevent zipper noise from the 'gain' knob */
double gf = pow (current.g / g, one_over_n);
for (int i = 0; i < frames; ++i)
{
register d_sample a = tone.process (s[i] + normal);
a = g * tube.transfer (a * temp);
a = down.process (tube.transfer_clip (up.upsample (a)));
for (int o = 1; o < OVERSAMPLE; ++o)
down.store (tube.transfer_clip (up.pad (o)));
F (d, i, dc_blocker.process (a), adding_gain);
g *= gf;
}
current.g = g;
}
/* //////////////////////////////////////////////////////////////////////// */
PortInfo
PreampIV::port_info [] =
{
{
"in",
INPUT | AUDIO,
{BOUNDED, -1, 1}
}, {
"gain",
INPUT | CONTROL,
{BOUNDED | DEFAULT_1, 0, 10}
}, {
"temperature",
INPUT | CONTROL,
{BOUNDED | DEFAULT_MID, 0.005, 1}
}, {
"bass",
INPUT | CONTROL,
{BOUNDED | DEFAULT_0, -20, 20}
}, {
"mid",
INPUT | CONTROL,
{BOUNDED | DEFAULT_0, -20, 20}
}, {
"treble",
INPUT | CONTROL,
{BOUNDED | DEFAULT_0, -20, 20}
}, {
"hi",
INPUT | CONTROL,
{BOUNDED | DEFAULT_0, -20, 20}
}, {
"out",
OUTPUT | AUDIO,
{0}
}, {
"latency",
OUTPUT | CONTROL,
{0}
}
};
template <> void
Descriptor<PreampIV>::setup()
{
UniqueID = 1777;
Label = "PreampIV";
Properties = HARD_RT;
Name = CAPS "PreampIV - Tube preamp emulation + tone controls";
Maker = "Tim Goetze <tim@quitte.de>";
Copyright = "GPL, 2002-7";
/* fill port info and vtable */
autogen();
}
|