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/* -*- c++ -*- */
/*
* Copyright 2014 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.
*/
#ifndef INCLUDED_DTV_ATSC_EQUALIZER_IMPL_H
#define INCLUDED_DTV_ATSC_EQUALIZER_IMPL_H
#include <gnuradio/dtv/atsc_equalizer.h>
#include <gnuradio/dtv/atsc_consts.h>
#include "atsc_syminfo_impl.h"
namespace gr {
namespace dtv {
class atsc_equalizer_impl : public atsc_equalizer
{
private:
static const int NTAPS = 64;
static const int NPRETAPS = (int) (NTAPS * 0.8); // probably should be either .2 or .8
// the length of the field sync pattern that we know unequivocally
static const int KNOWN_FIELD_SYNC_LENGTH = 4 + 511 + 3 * 63;
float training_sequence1[KNOWN_FIELD_SYNC_LENGTH];
float training_sequence2[KNOWN_FIELD_SYNC_LENGTH];
void filterN(const float *input_samples, float *output_samples, int nsamples);
void adaptN(const float *input_samples, const float *training_pattern,
float *output_samples, int nsamples);
float d_taps[NTAPS];
float data_mem[ATSC_DATA_SEGMENT_LENGTH + NTAPS]; // Buffer for previous data packet
float data_mem2[ATSC_DATA_SEGMENT_LENGTH];
unsigned short d_flags;
short d_segno;
int d_buff_not_filled;
public:
atsc_equalizer_impl();
~atsc_equalizer_impl();
virtual 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 dtv */
} /* namespace gr */
#endif /* INCLUDED_DTV_ATSC_EQUALIZER_IMPL_H */
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