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/* -*- c++ -*- */
/*
* Copyright 2006,2012 Free Software Foundation, Inc.
*
* This file is part of GNU Radio
*
* SPDX-License-Identifier: GPL-3.0-or-later
*
*/
#ifndef INCLUDED_ANALOG_PWR_SQUELCH_FF_H
#define INCLUDED_ANALOG_PWR_SQUELCH_FF_H
#include <gnuradio/analog/api.h>
#include <gnuradio/analog/squelch_base_ff.h>
#include <cmath>
namespace gr {
namespace analog {
/*!
* \brief gate or zero output when input power below threshold
* \ingroup level_controllers_blk
*/
class ANALOG_API pwr_squelch_ff : public squelch_base_ff, virtual public block
{
protected:
virtual void update_state(const float& in) = 0;
virtual bool mute() const = 0;
public:
// gr::analog::pwr_squelch_ff::sptr
typedef boost::shared_ptr<pwr_squelch_ff> sptr;
/*!
* \brief Make power-based squelch block.
*
* \param db threshold (in dB) for power squelch
* \param alpha Gain of averaging filter. Defaults to 0.0001.
* \param ramp attack / release time in samples; a sinusodial ramp
* is used. set to 0 to disable.
* \param gate if true, no output if no squelch tone.
* if false, output 0's if no squelch tone (default).
*
* The block will emit a tag with the key pmt::intern("squelch_sob")
* with the value of pmt::PMT_NIL on the first item it passes, and with
* the key pmt::intern("squelch:eob") on the last item it passes.
*/
static sptr make(double db, double alpha = 0.0001, int ramp = 0, bool gate = false);
virtual std::vector<float> squelch_range() const = 0;
virtual double threshold() const = 0;
virtual void set_threshold(double db) = 0;
virtual void set_alpha(double alpha) = 0;
virtual int ramp() const = 0;
virtual void set_ramp(int ramp) = 0;
virtual bool gate() const = 0;
virtual void set_gate(bool gate) = 0;
virtual bool unmuted() const = 0;
};
} /* namespace analog */
} /* namespace gr */
#endif /* INCLUDED_ANALOG_PWR_SQUELCH_FF_H */
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