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/*
Noisegate.h
Copyright 2011-13 Tim Goetze <tim@quitte.de>
http://quitte.de/dsp/
Noise reduction measures.
*/
/*
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 NOISE_GATE_H
#define NOISE_GATE_H
#include "dsp/util.h"
#include "dsp/IIR2.h"
#include "dsp/RBJ.h"
#include "dsp/RMS.h"
#include "dsp/Delay.h"
#include "dsp/IIR1.h"
class Noisegate
: public Plugin
{
public:
int N;
float over_N;
DSP::RMS<8192> rms;
uint remain;
struct {
float current, delta, quiet;
DSP::LP1<sample_t> lp;
float get()
{
current += delta;
/* this filter needs no normal addition because its input is always
* at least the closed-gate gain (currently -60 dB) */
return lp.process(current);
}
} gain;
struct {
uint age, threshold;
} hysteresis;
float f_mains;
DSP::IIR2<sample_t> humfilter[2];
void cycle (uint frames);
public:
static PortInfo port_info[];
void init();
void activate();
void process (sample_t x); /* pre- and humfilter, store to rms */
};
#endif /* NOISE_GATE_H */
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