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/* -*- c++ -*- */
/*
* Copyright 2005,2010,2013 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 "rms_ff_impl.h"
#include <gnuradio/io_signature.h>
#include <cmath>
namespace gr {
namespace blocks {
rms_ff::sptr rms_ff::make(double alpha)
{
return gnuradio::get_initial_sptr(new rms_ff_impl(alpha));
}
rms_ff_impl::rms_ff_impl(double alpha)
: sync_block("rms_ff",
io_signature::make(1, 1, sizeof(float)),
io_signature::make(1, 1, sizeof(float)))
{
set_alpha(alpha);
}
rms_ff_impl::~rms_ff_impl() {}
void rms_ff_impl::set_alpha(double alpha)
{
d_alpha = alpha;
d_beta = 1 - d_alpha;
d_avg = 0;
}
int rms_ff_impl::work(int noutput_items,
gr_vector_const_void_star& input_items,
gr_vector_void_star& output_items)
{
const float* in = (const float*)input_items[0];
float* out = (float*)output_items[0];
for (int i = 0; i < noutput_items; i++) {
double mag_sqrd = in[i] * in[i];
d_avg = d_beta * d_avg + d_alpha * mag_sqrd;
out[i] = sqrt(d_avg);
}
return noutput_items;
}
} /* namespace blocks */
} /* namespace gr */
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