3 * Copyright 2006 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 3, 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.
23 #ifndef INCLUDED_GR_CTCSS_SQUELCH_FF_H
24 #define INCLUDED_GR_CTCSS_SQUELCH_FF_H
26 #include <gr_squelch_base_ff.h>
27 #include <gri_goertzel.h>
29 class gr_ctcss_squelch_ff;
30 typedef boost::shared_ptr<gr_ctcss_squelch_ff> gr_ctcss_squelch_ff_sptr;
32 gr_ctcss_squelch_ff_sptr
33 gr_make_ctcss_squelch_ff(int rate, float freq, float level=0.01, int len=0, int ramp=0, bool gate=false);
36 * \brief gate or zero output if ctcss tone not present
39 class gr_ctcss_squelch_ff : public gr_squelch_base_ff
47 gri_goertzel d_goertzel_l;
48 gri_goertzel d_goertzel_c;
49 gri_goertzel d_goertzel_r;
51 friend gr_ctcss_squelch_ff_sptr gr_make_ctcss_squelch_ff(int rate, float freq, float level, int len, int ramp, bool gate);
52 gr_ctcss_squelch_ff(int rate, float freq, float level, int len, int ramp, bool gate);
54 int find_tone(float freq);
57 virtual void update_state(const float &in);
58 virtual bool mute() const { return d_mute; }
61 std::vector<float> squelch_range() const;
62 float level() const { return d_level; }
63 void set_level(float level) { d_level = level; }
64 int len() const { return d_len; }
67 #endif /* INCLUDED_GR_CTCSS_SQUELCH_FF_H */