GNU Radio 3.6.4 C++ API
digital_diff_encoder_bb.h
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1 /* -*- c++ -*- */
2 /*
3  * Copyright 2006,2012 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.
16  *
17  * You should have received a copy of the GNU General Public License
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22 
23 #ifndef INCLUDED_GR_DIFF_ENCODER_BB_H
24 #define INCLUDED_GR_DIFF_ENCODER_BB_H
25 
26 #include <digital_api.h>
27 #include <gr_sync_block.h>
28 
31 
33 digital_make_diff_encoder_bb(unsigned int modulus);
34 
35 /*!
36  * \brief y[0] = (x[0] + y[-1]) % M
37  * \ingroup coding_blk
38  *
39  * Uses current and previous symbols and the alphabet modulus to
40  * perform differential encoding.
41  */
43 {
45  digital_make_diff_encoder_bb(unsigned int modulus);
46  digital_diff_encoder_bb(unsigned int modulus);
47 
48  unsigned int d_last_out;
49  unsigned int d_modulus;
50 
51  public:
52  int work(int noutput_items,
53  gr_vector_const_void_star &input_items,
54  gr_vector_void_star &output_items);
55 };
56 
57 #endif