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/* -*- c++ -*- */
/*
* Copyright 2005,2010,2012 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.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "probe_avg_mag_sqrd_c_impl.h"
#include <gr_io_signature.h>
#include <cmath>
namespace gr {
namespace analog {
probe_avg_mag_sqrd_c::sptr
probe_avg_mag_sqrd_c::make(double threshold_db, double alpha)
{
return gnuradio::get_initial_sptr
(new probe_avg_mag_sqrd_c_impl(threshold_db, alpha));
}
probe_avg_mag_sqrd_c_impl::probe_avg_mag_sqrd_c_impl(double threshold_db, double alpha)
: gr_sync_block("probe_avg_mag_sqrd_c",
gr_make_io_signature(1, 1, sizeof(gr_complex)),
gr_make_io_signature(0, 0, 0)),
d_unmuted(false), d_level(0), d_iir(alpha)
{
set_threshold(threshold_db);
}
probe_avg_mag_sqrd_c_impl::~probe_avg_mag_sqrd_c_impl()
{
}
int
probe_avg_mag_sqrd_c_impl::work(int noutput_items,
gr_vector_const_void_star &input_items,
gr_vector_void_star &output_items)
{
const gr_complex *in = (const gr_complex*)input_items[0];
for(int i = 0; i < noutput_items; i++) {
double mag_sqrd = in[i].real()*in[i].real() + in[i].imag()*in[i].imag();
d_iir.filter(mag_sqrd); // computed for side effect: prev_output()
}
d_unmuted = d_iir.prev_output() >= d_threshold;
d_level = d_iir.prev_output();
return noutput_items;
}
double
probe_avg_mag_sqrd_c_impl::threshold() const
{
return 10 * std::log10(d_threshold);
}
void
probe_avg_mag_sqrd_c_impl::set_threshold(double decibels)
{
// convert to absolute threshold (mag squared)
d_threshold = std::pow(10.0, decibels/10);
}
void
probe_avg_mag_sqrd_c_impl::set_alpha(double alpha)
{
d_iir.set_taps(alpha);
}
} /* namespace analog */
} /* namespace gr */
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