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40 lines
1.8 KiB
C++
40 lines
1.8 KiB
C++
///////////////////////////////////////////////////////////////////////////////////////
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// Copyright (C) 2021 Jon Beniston, M7RCE <jon@beniston.com> //
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// //
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// This program is free software; you can redistribute it and/or modify //
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// it under the terms of the GNU General Public License as published by //
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// the Free Software Foundation as version 3 of the License, or //
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// (at your option) any later version. //
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// //
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// This program is distributed in the hope that it will be useful, //
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// but WITHOUT ANY WARRANTY; without even the implied warranty of //
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the //
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// GNU General Public License V3 for more details. //
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// //
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// You should have received a copy of the GNU General Public License //
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// along with this program. If not, see <http://www.gnu.org/licenses/>. //
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///////////////////////////////////////////////////////////////////////////////////////
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#include "DVB2.h"
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void DVB2::init_bb_randomiser(void)
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{
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int sr = 0x4A80;
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for( int i = 0; i < FRAME_SIZE_NORMAL; i++ )
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{
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int b = ((sr)^(sr>>1))&1;
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m_bb_randomise[i] = b;
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sr >>= 1;
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if( b ) sr |= 0x4000;
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}
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}
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//
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// Randomise the data bits
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//
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void DVB2::bb_randomise(void)
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{
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for( int i = 0; i < m_format[0].kbch; i++ )
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{
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m_frame[i] ^= m_bb_randomise[i];
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}
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}
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