3 * Copyright 2005 Free Software Foundation, Inc.
5 * This file is part of GNU Radio
7 * GNU Radio is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2, or (at your option)
12 * GNU Radio is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with GNU Radio; see the file COPYING. If not, write to
19 * the Free Software Foundation, Inc., 51 Franklin Street,
20 * Boston, MA 02110-1301, USA.
22 #ifndef INCLUDED_GR_SIMPLE_SQUELCH_CC_H
23 #define INCLUDED_GR_SIMPLE_SQUELCH_CC_H
25 #include <gr_sync_block.h>
26 #include <gr_single_pole_iir.h>
28 class gr_simple_squelch_cc;
29 typedef boost::shared_ptr<gr_simple_squelch_cc> gr_simple_squelch_cc_sptr;
31 gr_simple_squelch_cc_sptr
32 gr_make_simple_squelch_cc (double threshold_db, double alpha = 0.0001);
35 * \brief simple squelch block based on average signal power and threshold in dB.
37 class gr_simple_squelch_cc : public gr_sync_block
40 gr_single_pole_iir<double,double,double> d_iir;
43 friend gr_simple_squelch_cc_sptr
44 gr_make_simple_squelch_cc (double threshold_db, double alpha);
46 gr_simple_squelch_cc (double threshold_db, double alpha);
49 ~gr_simple_squelch_cc ();
51 int work (int noutput_items,
52 gr_vector_const_void_star &input_items,
53 gr_vector_void_star &output_items);
55 bool unmuted () const { return d_unmuted; }
57 void set_alpha (double alpha);
58 void set_threshold (double decibels);
60 double threshold() const;
61 std::vector<float> squelch_range() const;
65 #endif /* INCLUDED_GR_SIMPLE_SQUELCH_CC_H */