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/* -*- c++ -*- */
/*
* Copyright 2004,2005,2010,2012 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 "quadrature_demod_cf_impl.h"
#include <gr_io_signature.h>
#include <gr_math.h>
namespace gr {
namespace analog {
quadrature_demod_cf::sptr
quadrature_demod_cf::make(float gain)
{
return gnuradio::get_initial_sptr
(new quadrature_demod_cf_impl(gain));
}
quadrature_demod_cf_impl::quadrature_demod_cf_impl(float gain)
: gr_sync_block("quadrature_demod_cf",
gr_make_io_signature(1, 1, sizeof(gr_complex)),
gr_make_io_signature(1, 1, sizeof(float))),
d_gain(gain)
{
set_history(2); // we need to look at the previous value
}
quadrature_demod_cf_impl::~quadrature_demod_cf_impl()
{
}
int
quadrature_demod_cf_impl::work(int noutput_items,
gr_vector_const_void_star &input_items,
gr_vector_void_star &output_items)
{
gr_complex *in = (gr_complex*)input_items[0];
float *out = (float*)output_items[0];
in++; // ensure that in[-1] is valid
for(int i = 0; i < noutput_items; i++) {
gr_complex product = in[i] * conj(in[i-1]);
out[i] = d_gain * gr_fast_atan2f(imag(product), real(product));
}
return noutput_items;
}
} /* namespace analog */
} /* namespace gr */
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