gr-baz Package
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Scramble an input stream using an LFSR. More...
#include <baz_additive_scrambler_bb.h>
Public Types | |
typedef boost::shared_ptr< additive_scrambler_bb > | sptr |
Public Member Functions | |
virtual int | mask () const =0 |
virtual int | seed () const =0 |
virtual int | len () const =0 |
virtual int | count () const =0 |
virtual int | bits_per_byte ()=0 |
Static Public Member Functions | |
static sptr | make (int mask, int seed, int len, int count=0, int bits_per_byte=1, const std::string &reset_tag_key="") |
Create additive scrambler. More... | |
Scramble an input stream using an LFSR.
This block scrambles up to 8 bits per byte of the input data stream, starting at the LSB.
The scrambler works by XORing the incoming bit stream by the output of the LFSR. Optionally, after count
bits have been processed, the shift register is reset to the seed
value. This allows processing fixed length vectors of samples.
Alternatively, the LFSR can be reset using a reset tag to scramble variable length vectors. However, it cannot be reset between bytes.
For details on configuring the LFSR, see gr::digital::lfsr.
typedef boost::shared_ptr<additive_scrambler_bb> gr::baz::additive_scrambler_bb::sptr |
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pure virtual |
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pure virtual |
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pure virtual |
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static |
Create additive scrambler.
mask | Polynomial mask for LFSR |
seed | Initial shift register contents |
len | Shift register length |
count | Number of bytes after which shift register is reset, 0=never |
bits_per_byte | Number of bits per byte |
reset_tag_key | When a tag with this key is detected, the shift register is reset (when this is set, count is ignored!) |
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pure virtual |
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pure virtual |