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/* -*- c++ -*- */
/*
* Copyright 2002 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 2, 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 _ATSC_EQUALIZER_LMS2_H_
#define _ATSC_EQUALIZER_LMS2_H_
#include <atsci_equalizer.h>
#include <vector>
#include <stdio.h>
class atsci_equalizer_lms2 : public atsci_equalizer
{
public:
atsci_equalizer_lms2 ();
virtual ~atsci_equalizer_lms2 ();
virtual void reset ();
virtual int ntaps () const;
virtual int npretaps () const;
protected:
FILE *trainingfile;
virtual void filter_normal (const float *input_samples,
float *output_samples,
int nsamples);
virtual void filter_data_seg_sync (const float *input_samples,
float *output_samples,
int nsamples,
int offset);
virtual void filter_field_sync (const float *input_samples,
float *output_samples,
int nsamples,
int offset,
int which_field);
private:
std::vector<double> d_taps_ff;
std::vector<double> d_taps_fb;
std::vector<float> d_old_output;
int d_output_ptr;
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 filter1 (const float input[]);
float adapt1 (const float input[], float ideal_output);
};
#endif /* _ATSC_EQUALIZER_LMS2_H_ */
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