GNU Radio 3.7.2git-79-g931a7b07 C++ API
rotator.h
Go to the documentation of this file.
1 /* -*- c++ -*- */
2 /*
3  * Copyright 2003,2008,2013 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,
20  * Boston, MA 02110-1301, USA.
21  */
22 
23 #ifndef _GR_ROTATOR_H_
24 #define _GR_ROTATOR_H_
25 
26 #include <gnuradio/blocks/api.h>
27 #include <gnuradio/gr_complex.h>
28 
29 namespace gr {
30  namespace blocks {
31 
32  class rotator
33  {
34  private:
35  gr_complex d_phase;
36  gr_complex d_phase_incr;
37  unsigned int d_counter;
38 
39  public:
40  rotator() : d_phase(1), d_phase_incr(1), d_counter(0)
41  { }
42 
43  void set_phase(gr_complex phase) { d_phase = phase / abs(phase); }
44  void set_phase_incr(gr_complex incr) { d_phase_incr = incr / abs(incr); }
45 
47  {
48  d_counter++;
49 
50  gr_complex z = in * d_phase; // rotate in by phase
51  d_phase *= d_phase_incr; // incr our phase (complex mult == add phases)
52 
53  if((d_counter % 512) == 0)
54  d_phase /= abs(d_phase); // Normalize to ensure multiplication is rotation
55 
56  return z;
57  }
58  };
59 
60  } /* namespace blocks */
61 } /* namespace gr */
62 
63 #endif /* _GR_ROTATOR_H_ */