GNU Radio 3.6.1 C++ API
gr_ctcss_squelch_ff.h
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1 /* -*- c++ -*- */
2 /*
3  * Copyright 2006 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 
23 #ifndef INCLUDED_GR_CTCSS_SQUELCH_FF_H
24 #define INCLUDED_GR_CTCSS_SQUELCH_FF_H
25 
26 #include <gr_core_api.h>
27 #include <gr_squelch_base_ff.h>
28 #include <gri_goertzel.h>
29 
32 
34 gr_make_ctcss_squelch_ff(int rate, float freq, float level=0.01, int len=0, int ramp=0, bool gate=false);
35 
36 /*!
37  * \brief gate or zero output if ctcss tone not present
38  * \ingroup level_blk
39  */
41 {
42 private:
43  float d_freq;
44  float d_level;
45  int d_len;
46  bool d_mute;
47 
48  gri_goertzel d_goertzel_l;
49  gri_goertzel d_goertzel_c;
50  gri_goertzel d_goertzel_r;
51 
52  friend GR_CORE_API gr_ctcss_squelch_ff_sptr gr_make_ctcss_squelch_ff(int rate, float freq, float level, int len, int ramp, bool gate);
53  gr_ctcss_squelch_ff(int rate, float freq, float level, int len, int ramp, bool gate);
54 
55  int find_tone(float freq);
56 
57 protected:
58  virtual void update_state(const float &in);
59  virtual bool mute() const { return d_mute; }
60 
61 public:
62  std::vector<float> squelch_range() const;
63  float level() const { return d_level; }
64  void set_level(float level) { d_level = level; }
65  int len() const { return d_len; }
66 };
67 
68 #endif /* INCLUDED_GR_CTCSS_SQUELCH_FF_H */