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/* -*- c++ -*- */
/*
* Copyright 2006 Free Software Foundation, Inc.
*
* This file is part of GNU Radio
*
* GNU Radio 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, or (at your option)
* any later version.
*
* GNU Radio 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 GNU Radio; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#ifndef INCLUDED_GR_PWR_SQUELCH_CC_H
#define INCLUDED_GR_PWR_SQUELCH_CC_H
#include <gr_core_api.h>
#include <cmath>
#include <gr_squelch_base_cc.h>
#include <gr_single_pole_iir.h>
class gr_pwr_squelch_cc;
typedef boost::shared_ptr<gr_pwr_squelch_cc> gr_pwr_squelch_cc_sptr;
GR_CORE_API gr_pwr_squelch_cc_sptr
gr_make_pwr_squelch_cc(double db, double alpha = 0.0001, int ramp=0, bool gate=false);
/*!
* \brief gate or zero output when input power below threshold
* \ingroup level_blk
*/
class GR_CORE_API gr_pwr_squelch_cc : public gr_squelch_base_cc
{
private:
double d_threshold;
double d_pwr;
gr_single_pole_iir<double,double,double> d_iir;
friend GR_CORE_API gr_pwr_squelch_cc_sptr gr_make_pwr_squelch_cc(double db, double alpha, int ramp, bool gate);
gr_pwr_squelch_cc(double db, double alpha, int ramp, bool gate);
protected:
virtual void update_state(const gr_complex &in);
virtual bool mute() const { return d_pwr < d_threshold; }
public:
std::vector<float> squelch_range() const;
double threshold() const { return 10*log10(d_threshold); }
void set_threshold(double db) { d_threshold = std::pow(10.0, db/10); }
void set_alpha(double alpha) { d_iir.set_taps(alpha); }
};
#endif /* INCLUDED_GR_PWR_SQUELCH_CC_H */
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