GNU Radio Manual and C++ API Reference  3.7.9.2
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equalizer_lms2_impl.h
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1 /* -*- c++ -*- */
2 /*
3  * Copyright 2002 Free Software Foundation, Inc.
4  *
5  * This file is part of GNU Radio
6  *
7  * GNU Radio is free software; you can redistribute it and/or modify
8  * it under the terms of the GNU General Public License as published by
9  * the Free Software Foundation; either version 3, or (at your option)
10  * any later version.
11  *
12  * GNU Radio is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15  * GNU General Public License for more details.
16  *
17  * You should have received a copy of the GNU General Public License
18  * along with GNU Radio; see the file COPYING. If not, write to
19  * the Free Software Foundation, Inc., 51 Franklin Street,
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21  */
22 
23 #ifndef _ATSC_EQUALIZER_LMS2_H_
24 #define _ATSC_EQUALIZER_LMS2_H_
25 
26 #include <gnuradio/atsc/api.h>
28 #include <vector>
29 #include <stdio.h>
30 
32 {
33 public:
35  virtual ~atsci_equalizer_lms2 ();
36 
37  virtual void reset ();
38  virtual int ntaps () const;
39  virtual int npretaps () const;
40 
41 protected:
42  FILE *trainingfile;
43  virtual void filter_normal (const float *input_samples,
44  float *output_samples,
45  int nsamples);
46 
47  virtual void filter_data_seg_sync (const float *input_samples,
48  float *output_samples,
49  int nsamples,
50  int offset);
51 
52  virtual void filter_field_sync (const float *input_samples,
53  float *output_samples,
54  int nsamples,
55  int offset,
56  int which_field);
57 
58 private:
59  std::vector<double> d_taps_ff;
60  std::vector<double> d_taps_fb;
61  std::vector<float> d_old_output;
62 
63  int d_output_ptr;
64 
65  void filterN (const float *input_samples,
66  float *output_samples,
67  int nsamples);
68 
69  void adaptN (const float *input_samples,
70  const float *training_pattern,
71  float *output_samples,
72  int nsamples);
73 
74  float filter1 (const float input[]);
75  float adapt1 (const float input[], float ideal_output);
76 
77 };
78 
79 
80 #endif /* _ATSC_EQUALIZER_LMS2_H_ */
#define ATSC_API
Definition: gr-atsc/include/gnuradio/atsc/api.h:30
virtual int npretaps() const =0
how many taps are "in the future".
abstract base class for ATSC equalizer
Definition: equalizer_impl.h:33
virtual void filter_normal(const float *input_samples, float *output_samples, int nsamples)=0
Definition: equalizer_lms2_impl.h:31
virtual void filter_data_seg_sync(const float *input_samples, float *output_samples, int nsamples, int offset)=0
FILE * trainingfile
Definition: equalizer_lms2_impl.h:42
virtual void reset()
reset state (e.g., on channel change)
virtual void filter_field_sync(const float *input_samples, float *output_samples, int nsamples, int offset, int which_field)=0
virtual int ntaps() const =0
how much history the input data stream requires.