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/* -*- c++ -*- */
/*
* Copyright 2006, 2007 Frank (Radio Rausch)
* Copyright 2011 Steve Glass
*
* This file is part of OP25.
*
* This 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.
*
* This software 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 this software; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#ifndef INCLUDED_OP25_FSK4_DEMOD_FF_IMPL_H
#define INCLUDED_OP25_FSK4_DEMOD_FF_IMPL_H
#include <op25/fsk4_demod_ff.h>
namespace gr {
namespace op25 {
class fsk4_demod_ff_impl : public fsk4_demod_ff
{
private:
const float d_block_rate;
boost::scoped_array<float> d_history;
size_t d_history_last;
gr::msg_queue::sptr d_queue;
double d_symbol_clock;
double d_symbol_spread;
const float d_symbol_time;
double fine_frequency_correction;
double coarse_frequency_correction;
/**
* Called when we want the input frequency to be adjusted.
*/
void send_frequency_correction();
/**
* Tracking loop.
*/
bool tracking_loop_mmse(float input, float *output);
public:
fsk4_demod_ff_impl(gr::msg_queue::sptr queue, float sample_rate_Hz, float symbol_rate_Hz);
~fsk4_demod_ff_impl();
// Where all the action really happens
void forecast (int noutput_items, gr_vector_int &ninput_items_required);
int general_work(int noutput_items,
gr_vector_int &ninput_items,
gr_vector_const_void_star &input_items,
gr_vector_void_star &output_items);
};
} // namespace op25
} // namespace gr
#endif /* INCLUDED_OP25_FSK4_DEMOD_FF_IMPL_H */
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