3 * Copyright 2002 Free Software Foundation, Inc.
5 * This file is part of GNU Radio
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 2, or (at your option)
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.
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.
23 #include <atsci_basic_trellis_encoder.h>
26 const unsigned char atsci_basic_trellis_encoder::next_state[32] = {
37 const unsigned char atsci_basic_trellis_encoder::out_symbol[32] = {
50 * Encode two bit INPUT into 3 bit return value. Domain is [0,3],
51 * Range is [0,7]. The mapping to bipolar levels is not done.
55 atsci_basic_trellis_encoder::encode (unsigned int input)
58 int index = (state << 2) + input;
59 state = next_state[index];
60 return out_symbol[index];