GNU Radio 3.6.2 C++ API
digital_descrambler_bb.h
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1 /* -*- c++ -*- */
2 /*
3  * Copyright 2008,2012 Free Software Foundation, Inc.
4  *
5  * This file is part of GNU Radio
6  *
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)
10  * any later version.
11  *
12  * GNU Radio is distributed in the hope that it will be useful,
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14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15  * GNU General Public License for more details.
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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
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21  */
22 #ifndef INCLUDED_GR_DESCRAMBLER_BB_H
23 #define INCLUDED_GR_DESCRAMBLER_BB_H
24 
25 #include <digital_api.h>
26 #include <gr_sync_block.h>
27 #include "gri_lfsr.h"
28 
31 
33 digital_make_descrambler_bb(int mask, int seed, int len);
34 
35 /*!
36  * Descramble an input stream using an LFSR. This block works on the LSB only
37  * of the input data stream, i.e., on an "unpacked binary" stream, and
38  * produces the same format on its output.
39  *
40  * \param mask Polynomial mask for LFSR
41  * \param seed Initial shift register contents
42  * \param len Shift register length
43  *
44  * \ingroup coding_blk
45  */
46 
48 {
50  digital_make_descrambler_bb(int mask, int seed, int len);
51 
52  gri_lfsr d_lfsr;
53 
54  digital_descrambler_bb(int mask, int seed, int len);
55 
56 public:
57  int work(int noutput_items,
58  gr_vector_const_void_star &input_items,
59  gr_vector_void_star &output_items);
60 };
61 
62 #endif /* INCLUDED_GR_DESCRAMBLER_BB_H */