GNU Radio 3.6.3.1 C++ API
gr_additive_scrambler_bb.h
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/* -*- c++ -*- */
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/*
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* Copyright 2008,2010 Free Software Foundation, Inc.
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*
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* This file is part of GNU Radio
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*
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* GNU Radio 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; either version 3, or (at your option)
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* any later version.
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*
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* GNU Radio 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 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 GNU Radio; see the file COPYING. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street,
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* Boston, MA 02110-1301, USA.
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*/
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#ifndef INCLUDED_GR_ADDITIVE_SCRAMBLER_BB_H
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#define INCLUDED_GR_ADDITIVE_SCRAMBLER_BB_H
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#include <
gr_core_api.h
>
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#include <
gr_sync_block.h
>
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#include "
gri_lfsr.h
"
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class
gr_additive_scrambler_bb
;
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typedef
boost::shared_ptr<gr_additive_scrambler_bb>
gr_additive_scrambler_bb_sptr
;
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GR_CORE_API
gr_additive_scrambler_bb_sptr
gr_make_additive_scrambler_bb
(
int
mask,
int
seed,
int
len,
int
count=0);
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/*!
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* Scramble an input stream using an LFSR. This block works on the LSB only
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* of the input data stream, i.e., on an "unpacked binary" stream, and
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* produces the same format on its output.
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*
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* \param mask Polynomial mask for LFSR
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* \param seed Initial shift register contents
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* \param len Shift register length
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* \param count Number of bits after which shift register is reset, 0=never
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*
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* The scrambler works by XORing the incoming bit stream by the output of
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* the LFSR. Optionally, after 'count' bits have been processed, the shift
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* register is reset to the seed value. This allows processing fixed length
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* vectors of samples.
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*
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* \ingroup coding_blk
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*/
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class
GR_CORE_API
gr_additive_scrambler_bb
:
public
gr_sync_block
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{
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friend
GR_CORE_API
gr_additive_scrambler_bb_sptr
gr_make_additive_scrambler_bb
(
int
mask,
int
seed,
int
len,
int
count);
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gri_lfsr
d_lfsr;
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int
d_count;
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int
d_bits;
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gr_additive_scrambler_bb
(
int
mask,
int
seed,
int
len,
int
count);
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public
:
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int
work
(
int
noutput_items,
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gr_vector_const_void_star
&input_items,
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gr_vector_void_star
&output_items);
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};
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#endif
/* INCLUDED_GR_ADDITIVE_SCRAMBLER_BB_H */
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gr_additive_scrambler_bb.h
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