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pwr_squelch_cc_impl.h
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1 /* -*- c++ -*- */
2 /*
3  * Copyright 2006,2012 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_ANALOG_PWR_SQUELCH_CC_IMPL_H
24 #define INCLUDED_ANALOG_PWR_SQUELCH_CC_IMPL_H
25 
26 #include <analog/pwr_squelch_cc.h>
27 #include "squelch_base_cc_impl.h"
28 #include <filter/single_pole_iir.h>
29 #include <cmath>
30 
31 namespace gr {
32  namespace analog {
33 
36  {
37  private:
38  double d_threshold;
39  double d_pwr;
41 
42  protected:
43  virtual void update_state(const gr_complex &in);
44  virtual bool mute() const { return d_pwr < d_threshold; }
45 
46  public:
47  pwr_squelch_cc_impl(double db, double alpha=0.0001,
48  int ramp=0, bool gate=false);
50 
51  std::vector<float> squelch_range() const;
52 
53  double threshold() const { return 10*log10(d_threshold); }
54  void set_threshold(double db) { d_threshold = std::pow(10.0, db/10); }
55  void set_alpha(double alpha) { d_iir.set_taps(alpha); }
56 
57  int ramp() const { return squelch_base_cc_impl::ramp(); }
58  void set_ramp(int ramp) { squelch_base_cc_impl::set_ramp(ramp); }
59  bool gate() const { return squelch_base_cc_impl::gate(); }
60  void set_gate(bool gate) { squelch_base_cc_impl::set_gate(gate); }
61  bool unmuted() const { return squelch_base_cc_impl::unmuted(); }
62 
63  int general_work(int noutput_items,
64  gr_vector_int &ninput_items,
65  gr_vector_const_void_star &input_items,
66  gr_vector_void_star &output_items)
67  {
68  return squelch_base_cc_impl::general_work(noutput_items,
69  ninput_items,
70  input_items,
71  output_items);
72  }
73  };
74 
75  } /* namespace analog */
76 } /* namespace gr */
77 
78 #endif /* INCLUDED_ANALOG_PWR_SQUELCH_CC_IMPL_H */