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/*
Phaser.h
Copyright 2002-5 Tim Goetze <tim@quitte.de>
http://quitte.de/dsp/
Standard and fractal-modulated phaser units.
*/
/*
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.
*/
#ifndef _PHASER_H_
#define _PHASER_H_
#include "dsp/Sine.h"
#include "dsp/Lorenz.h"
#include "dsp/Delay.h"
/* all-pass as used by the phaser. */
class PhaserAP
{
public:
d_sample a, m;
PhaserAP()
{
a = m = 0.;
}
void set (double delay)
{
a = (1 - delay) / (1 + delay);
}
d_sample process (d_sample x)
{
register d_sample y = -a * x + m;
m = a * y + x;
return y;
}
};
class PhaserI
{
public:
double fs;
PhaserAP ap[6];
DSP::Sine lfo;
d_sample rate;
d_sample y0;
d_sample normal;
struct {
double bottom, range;
} delay;
template <sample_func_t>
void one_cycle (int frames);
int blocksize, remain;
public:
d_sample * ports [6];
static PortInfo port_info [];
d_sample adding_gain;
void init (double _fs)
{
fs = _fs;
blocksize = 32;
normal = NOISE_FLOOR;
}
void activate()
{
y0 = 0.;
remain = 0;
delay.bottom = 400. / fs;
delay.range = 2200. / fs;
rate = -1; /* force lfo reset in one_cycle() */
}
void run (int n)
{
one_cycle<store_func> (n);
}
void run_adding (int n)
{
one_cycle<adding_func> (n);
}
};
/* same as above, but filter sweep is controlled by a Lorenz fractal */
class PhaserII
{
public:
double fs;
PhaserAP ap[6];
DSP::Lorenz lorenz;
d_sample rate;
d_sample y0;
d_sample normal;
struct {
double bottom, range;
} delay;
template <sample_func_t>
void one_cycle (int frames);
int blocksize, remain;
public:
d_sample * ports [6];
static PortInfo port_info [];
d_sample adding_gain;
void init (double _fs)
{
fs = _fs;
blocksize = 32;
normal = NOISE_FLOOR;
lorenz.init();
}
void activate()
{
y0 = 0.;
remain = 0;
delay.bottom = 400. / fs;
delay.range = 2200. / fs;
rate = -1; /* force lfo reset in one_cycle() */
}
void run (int n)
{
one_cycle<store_func> (n);
}
void run_adding (int n)
{
one_cycle<adding_func> (n);
}
};
#endif /* _PHASER_H_ */
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