GNU Radio 3.5.3.1 C++ API
gr_filter_delay_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,
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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
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_FILTER_DELAY_FC_H
24 #define INCLUDED_GR_FILTER_DELAY_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_filter_delay_fc;
33 
34 // public constructor
36 
37 class gr_fir_fff;
38 
39 /*!
40  * \brief Filter-Delay Combination Block.
41  * \ingroup filter_blk
42  *
43  * The block takes one or two float stream and outputs a complex
44  * stream. If only one float stream is input, the real output is
45  * a delayed version of this input and the imaginary output is the
46  * filtered output. If two floats are connected to the input, then
47  * the real output is the delayed version of the first input, and
48  * the imaginary output is the filtered output. The delay in the
49  * real path accounts for the group delay introduced by the filter
50  * in the imaginary path. The filter taps needs to be calculated
51  * before initializing this block.
52  *
53  */
55 {
56  public:
58 
59  int work (int noutput_items,
60  gr_vector_const_void_star &input_items,
61  gr_vector_void_star &output_items);
62 
63  protected:
64  gr_filter_delay_fc (const std::vector<float> &taps);
65 
66  private:
67  unsigned int d_delay;
68  gr_fir_fff *d_fir;
69 
70  friend GR_CORE_API gr_filter_delay_fc_sptr gr_make_filter_delay_fc (const std::vector<float> &taps);
71 };
72 
73 #endif /* INCLUDED_GR_FILTER_DELAY_FC_H */