3 * Copyright 2008 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 3, 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.
22 #ifndef INCLUDED_GR_SCRAMBLER_BB_H
23 #define INCLUDED_GR_SCRAMBLER_BB_H
25 #include <gr_sync_block.h>
28 class gr_scrambler_bb;
29 typedef boost::shared_ptr<gr_scrambler_bb> gr_scrambler_bb_sptr;
31 gr_scrambler_bb_sptr gr_make_scrambler_bb(int mask, int seed, int len);
34 * Scramble an input stream using an LFSR. This block works on the LSB only
35 * of the input data stream, i.e., on an "unpacked binary" stream, and
36 * produces the same format on its output.
38 * \param mask Polynomial mask for LFSR
39 * \param seed Initial shift register contents
40 * \param len Shift register length
45 class gr_scrambler_bb : public gr_sync_block
47 friend gr_scrambler_bb_sptr gr_make_scrambler_bb(int mask, int seed, int len);
51 gr_scrambler_bb(int mask, int seed, int len);
54 int work(int noutput_items,
55 gr_vector_const_void_star &input_items,
56 gr_vector_void_star &output_items);
59 #endif /* INCLUDED_GR_SCRAMBLER_BB_H */