GNU Radio 3.6.1 C++ API
atsci_equalizer_lms.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,
20  * Boston, MA 02110-1301, USA.
21  */
22 
23 #ifndef _ATSC_EQUALIZER_LMS_H_
24 #define _ATSC_EQUALIZER_LMS_H_
25 
26 #include <atsc_api.h>
27 #include <atsci_equalizer.h>
28 #include <vector>
29 #include <stdio.h>
30 
32 {
33 public:
35  virtual ~atsci_equalizer_lms ();
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;
60 
61  void filterN (const float *input_samples,
62  float *output_samples,
63  int nsamples);
64 
65  void adaptN (const float *input_samples,
66  const float *training_pattern,
67  float *output_samples,
68  int nsamples);
69 
70  float filter1 (const float input[]);
71  float adapt1 (const float input[], float ideal_output);
72 
73 };
74 
75 
76 #endif /* _ATSC_EQUALIZER_LMS_H_ */