gr_descrambler_bb_sptr gr_make_descrambler_bb(int mask, int seed, int len);
/*!
- * \brief Descramble an input stream using an LFSR
+ * Descramble an input stream using an LFSR. This block works on the LSB only
+ * of the input data stream, i.e., on an "unpacked binary" stream, and
+ * produces the same format on its output.
*
* \param mask Polynomial mask for LFSR
* \param seed Initial shift register contents
gr_scrambler_bb_sptr gr_make_scrambler_bb(int mask, int seed, int len);
/*!
- * \brief Scramble an input stream using an LFSR
+ * Scramble an input stream using an LFSR. This block works on the LSB only
+ * of the input data stream, i.e., on an "unpacked binary" stream, and
+ * produces the same format on its output.
*
* \param mask Polynomial mask for LFSR
* \param seed Initial shift register contents
/* -*- c++ -*- */
/*
- * Copyright 2007 Free Software Foundation, Inc.
+ * Copyright 2008 Free Software Foundation, Inc.
*
* This file is part of GNU Radio
*
* next_bit_descramble(unsigned char input) - Descramble an input stream
*
* Perform one cycle of the LFSR. The output bit is taken from
- * the modulo-2 sum of the masked shift register and the input LSB.
+ * the modulo 2 sum of the masked shift register and the input LSB.
* The shift register MSB is assigned from the LSB of the input.
*
* See http://en.wikipedia.org/wiki/Scrambler for operation of these
qa_gri_lfsr::test_scrambler()
{
// CCSDS 7-bit scrambler
- int mask = 0x8A; // 1+x^4+X^6
+ int mask = 0x8A;
int seed = 0x7F;
int length = 7;