mirror of
https://github.com/f4exb/sdrangel.git
synced 2024-11-11 10:56:12 -05:00
40 lines
1.8 KiB
C++
40 lines
1.8 KiB
C++
///////////////////////////////////////////////////////////////////////////////////////
|
|
// Copyright (C) 2021 Jon Beniston, M7RCE <jon@beniston.com> //
|
|
// //
|
|
// This program 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 as version 3 of the License, or //
|
|
// (at your option) any later version. //
|
|
// //
|
|
// This program 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 V3 for more details. //
|
|
// //
|
|
// You should have received a copy of the GNU General Public License //
|
|
// along with this program. If not, see <http://www.gnu.org/licenses/>. //
|
|
///////////////////////////////////////////////////////////////////////////////////////
|
|
#include "DVB2.h"
|
|
|
|
void DVB2::init_bb_randomiser(void)
|
|
{
|
|
int sr = 0x4A80;
|
|
for( int i = 0; i < FRAME_SIZE_NORMAL; i++ )
|
|
{
|
|
int b = ((sr)^(sr>>1))&1;
|
|
m_bb_randomise[i] = b;
|
|
sr >>= 1;
|
|
if( b ) sr |= 0x4000;
|
|
}
|
|
}
|
|
//
|
|
// Randomise the data bits
|
|
//
|
|
void DVB2::bb_randomise(void)
|
|
{
|
|
for( int i = 0; i < m_format[0].kbch; i++ )
|
|
{
|
|
m_frame[i] ^= m_bb_randomise[i];
|
|
}
|
|
}
|