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/* -*- c++ -*- */
/*
* Copyright 2002 Free Software Foundation, Inc.
*
* This file is part of GNU Radio
*
* GNU Radio is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3, or (at your option)
* any later version.
*
* GNU Radio is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GNU Radio; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#ifndef _ATSCSINGLEVITERBI_H_
#define _ATSCSINGLEVITERBI_H_
#include <atsc_api.h>
/*!
* \brief single channel viterbi decoder
*/
class ATSC_API atsci_single_viterbi
{
public:
atsci_single_viterbi ();
static const 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
int delay () { return TB_LEN - 1; }
protected:
static const int transition_table[32];
static const float was_sent[32];
float path_metrics [2][8];
unsigned long long traceback [2][8];
unsigned char phase;
};
#endif
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