GNU Radio 3.7.2 C++ API
single_viterbi_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,
20  * Boston, MA 02110-1301, USA.
21  */
22 
23 #ifndef _ATSCSINGLEVITERBI_H_
24 #define _ATSCSINGLEVITERBI_H_
25 
26 #include <gnuradio/atsc/api.h>
27 
28 /*!
29  * \brief single channel viterbi decoder
30  */
32 {
33 
34 public:
36 
37  static const unsigned int TB_LEN = 32;
38 
39  /*!
40  * \p INPUT ideally takes on the values +/- 1,3,5,7
41  * return is decoded dibit in the range [0, 3]
42  */
43  char decode (float input);
44 
45  void reset ();
46 
47  //! internal delay of decoder
48  int delay () { return TB_LEN - 1; }
49 
50 protected:
51  static const int transition_table[32];
52  static const float was_sent[32];
53  float path_metrics [2][8];
54  unsigned long long traceback [2][8];
55  unsigned char phase;
56 };
57 
58 #endif
#define ATSC_API
Definition: gr-atsc/include/gnuradio/atsc/api.h:30
int delay()
internal delay of decoder
Definition: single_viterbi_impl.h:48
single channel viterbi decoder
Definition: single_viterbi_impl.h:31
unsigned char phase
Definition: single_viterbi_impl.h:55