GNU Radio Manual and C++ API Reference  3.7.9.2
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equalizer_lms_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
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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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22 
23 #ifndef _ATSC_EQUALIZER_LMS_H_
24 #define _ATSC_EQUALIZER_LMS_H_
25 
26 #include <gnuradio/atsc/api.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  std::vector<double> taps () {
41  return d_taps;
42  }
43 
44 protected:
45  FILE *trainingfile;
46  virtual void filter_normal (const float *input_samples,
47  float *output_samples,
48  int nsamples);
49 
50  virtual void filter_data_seg_sync (const float *input_samples,
51  float *output_samples,
52  int nsamples,
53  int offset);
54 
55  virtual void filter_field_sync (const float *input_samples,
56  float *output_samples,
57  int nsamples,
58  int offset,
59  int which_field);
60 
61 private:
62  std::vector<double> d_taps;
63 
64  void filterN (const float *input_samples,
65  float *output_samples,
66  int nsamples);
67 
68  void adaptN (const float *input_samples,
69  const float *training_pattern,
70  float *output_samples,
71  int nsamples);
72 
73  float filter1 (const float input[]);
74  float adapt1 (const float input[], float ideal_output);
75 
76 };
77 
78 
79 #endif /* _ATSC_EQUALIZER_LMS_H_ */
#define ATSC_API
Definition: gr-atsc/include/gnuradio/atsc/api.h:30
std::vector< double > taps()
Definition: equalizer_lms_impl.h:40
Definition: equalizer_lms_impl.h:31
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
virtual void filter_data_seg_sync(const float *input_samples, float *output_samples, int nsamples, int offset)=0
virtual void reset()
reset state (e.g., on channel change)
FILE * trainingfile
Definition: equalizer_lms_impl.h:45
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.