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/* -*- c++ -*- */
/*
* Copyright 2006 Free Software Foundation, Inc.
*
* This file is part of GNU Radio
*
* GNU Radio is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3, or (at your option)
* any later version.
*
* GNU Radio is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GNU Radio; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#ifndef INCLUDED_GR_CTCSS_SQUELCH_FF_H
#define INCLUDED_GR_CTCSS_SQUELCH_FF_H
#include <gr_core_api.h>
#include <gr_squelch_base_ff.h>
#include <gri_goertzel.h>
class gr_ctcss_squelch_ff;
typedef boost::shared_ptr<gr_ctcss_squelch_ff> gr_ctcss_squelch_ff_sptr;
GR_CORE_API gr_ctcss_squelch_ff_sptr
gr_make_ctcss_squelch_ff(int rate, float freq, float level=0.01, int len=0, int ramp=0, bool gate=false);
/*!
* \brief gate or zero output if ctcss tone not present
* \ingroup level_blk
*/
class GR_CORE_API gr_ctcss_squelch_ff : public gr_squelch_base_ff
{
private:
float d_freq;
float d_level;
int d_len;
bool d_mute;
gri_goertzel d_goertzel_l;
gri_goertzel d_goertzel_c;
gri_goertzel d_goertzel_r;
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);
gr_ctcss_squelch_ff(int rate, float freq, float level, int len, int ramp, bool gate);
int find_tone(float freq);
protected:
virtual void update_state(const float &in);
virtual bool mute() const { return d_mute; }
public:
std::vector<float> squelch_range() const;
float level() const { return d_level; }
void set_level(float level) { d_level = level; }
int len() const { return d_len; }
};
#endif /* INCLUDED_GR_CTCSS_SQUELCH_FF_H */
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