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/*
Clip.h
Copyright 2004-5 Tim Goetze <tim@quitte.de>
http://quitte.de/dsp/
oversampled hard ('diode', 'transistor', sometimes 'op-amp') clipper.
*/
/*
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 _CLIP_H_
#define _CLIP_H_
#include "dsp/util.h"
#include "dsp/FIR.h"
#include "dsp/sinc.h"
#include "dsp/windows.h"
class Clip
{
public:
double fs;
d_sample gain, gain_db;
d_sample threshold[2];
enum {
OVERSAMPLE = 8,
FIR_SIZE = 64,
};
/* antialias filters */
DSP::FIRUpsampler up;
DSP::FIR down;
template <sample_func_t F>
void one_cycle (int frames);
inline d_sample clip (d_sample x);
public:
static PortInfo port_info[];
d_sample * ports [4];
d_sample adding_gain;
Clip()
: up (FIR_SIZE, OVERSAMPLE),
down (FIR_SIZE)
{ }
void init (double fs);
void activate()
{
up.reset();
down.reset();
gain_db = *ports[1];
gain = DSP::db2lin (gain_db);
}
void run (int n)
{
one_cycle<store_func> (n);
}
void run_adding (int n)
{
one_cycle<adding_func> (n);
}
};
#endif /* _CLIP_H_ */
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