GNU Radio 3.6.4 C++ API
gr_simple_squelch_cc.h
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1 /* -*- c++ -*- */
2 /*
3  * Copyright 2005 Free Software Foundation, Inc.
4  *
5  * This file is part of GNU Radio
6  *
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 3, or (at your option)
10  * any later version.
11  *
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.
16  *
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.
21  */
22 #ifndef INCLUDED_GR_SIMPLE_SQUELCH_CC_H
23 #define INCLUDED_GR_SIMPLE_SQUELCH_CC_H
24 
25 #include <gr_core_api.h>
26 #include <gr_sync_block.h>
27 #include <gr_single_pole_iir.h>
28 
31 
33 gr_make_simple_squelch_cc (double threshold_db, double alpha = 0.0001);
34 
35 /*!
36  * \brief simple squelch block based on average signal power and threshold in dB.
37  * \ingroup level_blk
38  */
40 {
41  double d_threshold;
43  bool d_unmuted;
44 
46  gr_make_simple_squelch_cc (double threshold_db, double alpha);
47 
48  gr_simple_squelch_cc (double threshold_db, double alpha);
49 
50 public:
52 
53  int work (int noutput_items,
54  gr_vector_const_void_star &input_items,
55  gr_vector_void_star &output_items);
56 
57  bool unmuted () const { return d_unmuted; }
58 
59  void set_alpha (double alpha);
60  void set_threshold (double decibels);
61 
62  double threshold() const;
63  std::vector<float> squelch_range() const;
64 
65 };
66 
67 #endif /* INCLUDED_GR_SIMPLE_SQUELCH_CC_H */