GNU Radio 3.5.3.1 C++ API
atsci_basic_trellis_encoder.h
Go to the documentation of this file.
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
#ifndef _ATSC_BASIC_TRELLIS_ENCODER_H_
23
#define _ATSC_BASIC_TRELLIS_ENCODER_H_
24
25
#include <
atsc_api.h
>
26
#include <assert.h>
27
28
/*!
29
* \brief ATSC trellis encoder building block.
30
*
31
* Note this is NOT the 12x interleaved interface.
32
*
33
* This implements a single instance of the ATSC trellis encoder.
34
* This is a rate 2/3 encoder (really a constraint length 3, rate 1/2
35
* encoder with the top bit passed through unencoded. This does not
36
* implement the "precoding" of the top bit, because the NTSC rejection
37
* filter is not supported.
38
*/
39
40
class
ATSC_API
atsci_basic_trellis_encoder
{
41
42
private
:
43
int
state;
// two bit state;
44
45
public
:
46
atsci_basic_trellis_encoder
() : state (0) {}
47
48
/*!
49
* Encode two bit INPUT into 3 bit return value. Domain is [0,3],
50
* Range is [0,7]. The mapping to bipolar levels is not done.
51
*/
52
int
encode
(
unsigned
int
input);
53
54
//! reset encoder state
55
void
reset
() { state = 0; }
56
57
static
const
unsigned
char
next_state[32];
58
static
const
unsigned
char
out_symbol[32];
59
};
60
61
#endif
/* _ATSC_BASIC_TRELLIS_ENCODER_H_ */
gr-atsc
src
lib
atsci_basic_trellis_encoder.h
Generated by
1.8.1.1