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/* -*- c++ -*- */
/*
* Copyright 2005 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_SIMPLE_SQUELCH_CC_H
#define INCLUDED_GR_SIMPLE_SQUELCH_CC_H
#include <gr_core_api.h>
#include <gr_sync_block.h>
#include <gr_single_pole_iir.h>
class gr_simple_squelch_cc;
typedef boost::shared_ptr<gr_simple_squelch_cc> gr_simple_squelch_cc_sptr;
GR_CORE_API gr_simple_squelch_cc_sptr
gr_make_simple_squelch_cc (double threshold_db, double alpha = 0.0001);
/*!
* \brief simple squelch block based on average signal power and threshold in dB.
* \ingroup level_blk
*/
class GR_CORE_API gr_simple_squelch_cc : public gr_sync_block
{
double d_threshold;
gr_single_pole_iir<double,double,double> d_iir;
bool d_unmuted;
friend GR_CORE_API gr_simple_squelch_cc_sptr
gr_make_simple_squelch_cc (double threshold_db, double alpha);
gr_simple_squelch_cc (double threshold_db, double alpha);
public:
~gr_simple_squelch_cc ();
int work (int noutput_items,
gr_vector_const_void_star &input_items,
gr_vector_void_star &output_items);
bool unmuted () const { return d_unmuted; }
void set_alpha (double alpha);
void set_threshold (double decibels);
double threshold() const;
std::vector<float> squelch_range() const;
};
#endif /* INCLUDED_GR_SIMPLE_SQUELCH_CC_H */
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