blob: 011e4fdc795be74549986ed8a0d43aade865c177 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
|
/* -*- c++ -*- */
/*
* Copyright 2002, 2014 Free Software Foundation, Inc.
*
* This file is part of GNU Radio
*
* SPDX-License-Identifier: GPL-3.0-or-later
*
*/
#ifndef INCLUDED_DTV_ATSC_SINGLE_VITERBI_H
#define INCLUDED_DTV_ATSC_SINGLE_VITERBI_H
namespace gr {
namespace dtv {
class atsc_single_viterbi
{
public:
atsc_single_viterbi();
static constexpr unsigned int TB_LEN = 32;
/*!
* \p INPUT ideally takes on the values +/- 1,3,5,7
* return is decoded dibit in the range [0, 3]
*/
char decode(float input);
void reset();
//! internal delay of decoder
static int delay() { return TB_LEN - 1; }
float best_state_metric() const;
protected:
static const int d_transition_table[4][4];
static const int d_was_sent[4][4];
float d_path_metrics[2][4];
unsigned long long d_traceback[2][4];
unsigned char d_phase;
int d_post_coder_state;
float d_best_state_metric;
};
} /* namespace dtv */
} /* namespace gr */
#endif /* INCLUDED_DTV_ATSC_SINGLE_VITERBI_H */
|
