GNU Radio 3.5.3.2 C++ API
gr_hilbert_fc.h
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1 /* -*- c++ -*- */
2 /*
3  * Copyright 2004 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,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
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
18  * along with GNU Radio; see the file COPYING. If not, write to
19  * the Free Software Foundation, Inc., 51 Franklin Street,
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21  */
22 
23 #ifndef INCLUDED_GR_HILBERT_FC_H
24 #define INCLUDED_GR_HILBERT_FC_H
25 
26 #include <gr_core_api.h>
27 #include <gr_sync_block.h>
28 #include <gr_io_signature.h>
29 #include <gr_types.h>
30 
31 class gr_hilbert_fc;
33 
34 // public constructor
36 
37 
38 class gr_fir_fff;
39 
40 /*!
41  * \brief Hilbert transformer.
42  * \ingroup filter_blk
43  *
44  * real output is input appropriately delayed.
45  * imaginary output is hilbert filtered (90 degree phase shift)
46  * version of input.
47  */
49 {
50  public:
51  ~gr_hilbert_fc ();
52 
53  int work (int noutput_items,
54  gr_vector_const_void_star &input_items,
55  gr_vector_void_star &output_items);
56 
57  protected:
58  gr_hilbert_fc (unsigned int ntaps);
59 
60  private:
61  unsigned int d_ntaps;
62  gr_fir_fff *d_hilb;
63 
64  friend GR_CORE_API gr_hilbert_fc_sptr gr_make_hilbert_fc (unsigned int ntaps);
65 };
66 
67 
68 
69 #endif /* INCLUDED_GR_HILBERT_FC_H */