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/*
Phaser.h
Copyright 2002-13 Tim Goetze <tim@quitte.de>
http://quitte.de/dsp/
Phaser effect plugin.
*/
/*
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 3
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/Roessler.h"
#include "dsp/Delay.h"
#include "dsp/IIR1.h"
class PhaserAP
{
public:
sample_t a, m;
PhaserAP() { a=m=0.; }
void set (sample_t delay)
{ a = (1-delay) / (1+delay); }
sample_t process (sample_t x)
{
sample_t y = -a*x + m;
m = a*y + x;
return y;
}
};
class PhaserII
: public Plugin
{
public:
enum {Notches = 12};
PhaserAP ap[Notches];
struct {
DSP::Sine sine;
DSP::Roessler roessler;
DSP::LP1<sample_t> lp;
} lfo;
sample_t rate;
sample_t y0;
struct {
double bottom, range;
} delay;
void cycle (uint frames);
uint blocksize, remain;
public:
static PortInfo port_info [];
void init()
{
blocksize = 16;
if (fs > 32000) blocksize *= 2;
if (fs > 64000) blocksize *= 2;
if (fs > 128000) blocksize *= 2;
lfo.roessler.init();
lfo.sine.set_f (300*over_fs,0);
}
void activate()
{
y0 = 0.;
remain = 0;
delay.bottom = 400*over_fs;
delay.range = 2200*over_fs;
}
};
#endif /* PHASER_H */
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