GNU Radio Manual and C++ API Reference  3.7.9.2
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rotator.h
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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,
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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 #include <volk/volk.h>
29 
30 namespace gr {
31  namespace blocks {
32 
33  class rotator
34  {
35  private:
36  gr_complex d_phase;
37  gr_complex d_phase_incr;
38  unsigned int d_counter;
39 
40  public:
41  rotator() : d_phase(1), d_phase_incr(1), d_counter(0)
42  { }
43 
44  void set_phase(gr_complex phase) { d_phase = phase / abs(phase); }
45  void set_phase_incr(gr_complex incr) { d_phase_incr = incr / abs(incr); }
46 
48  {
49  d_counter++;
50 
51  gr_complex z = in * d_phase; // rotate in by phase
52  d_phase *= d_phase_incr; // incr our phase (complex mult == add phases)
53 
54  if((d_counter % 512) == 0)
55  d_phase /= abs(d_phase); // Normalize to ensure multiplication is rotation
56 
57  return z;
58  }
59 
60  void rotateN(gr_complex *out, const gr_complex *in, int n)
61  {
62  volk_32fc_s32fc_x2_rotator_32fc(out, in, d_phase_incr, &d_phase, n);
63  }
64  };
65 
66  } /* namespace blocks */
67 } /* namespace gr */
68 
69 #endif /* _GR_ROTATOR_H_ */
void rotateN(gr_complex *out, const gr_complex *in, int n)
Definition: rotator.h:60
void set_phase_incr(gr_complex incr)
Definition: rotator.h:45
void set_phase(gr_complex phase)
Definition: rotator.h:44
gr_complex rotate(gr_complex in)
Definition: rotator.h:47
std::complex< float > gr_complex
Definition: gr_complex.h:27
Include this header to use the message passing features.
Definition: logger.h:131
rotator()
Definition: rotator.h:41
Definition: rotator.h:33