GNU Radio 3.6.4 C++ API
gr_fxpt_vco.h
Go to the documentation of this file.
1 /* -*- c++ -*- */
2 /*
3  * Copyright 2002,2004,2005 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 #ifndef INCLUDED_GR_FXPT_VCO_H
23 #define INCLUDED_GR_FXPT_VCO_H
24 
25 #include <gr_core_api.h>
26 #include <gr_fxpt.h>
27 #include <gr_complex.h>
28 
29 /*!
30  * \brief Voltage Controlled Oscillator (VCO)
31  * \ingroup misc
32  */
34  gr_int32 d_phase;
35 
36 public:
37  gr_fxpt_vco () : d_phase (0) {}
38 
40 
41  // radians
42  void set_phase (float angle) {
43  d_phase = gr_fxpt::float_to_fixed (angle);
44  }
45 
46  void adjust_phase (float delta_phase) {
47  d_phase += gr_fxpt::float_to_fixed (delta_phase);
48  }
49 
50  float get_phase () const { return gr_fxpt::fixed_to_float (d_phase); }
51 
52  // compute sin and cos for current phase angle
53  void sincos (float *sinx, float *cosx) const
54  {
55  *sinx = gr_fxpt::sin (d_phase);
56  *cosx = gr_fxpt::cos (d_phase);
57  }
58 
59  // compute a block at a time
60  void cos (float *output, const float *input, int noutput_items, float k, float ampl = 1.0)
61  {
62  for (int i = 0; i < noutput_items; i++){
63  output[i] = (float)(gr_fxpt::cos (d_phase) * ampl);
64  adjust_phase(input[i] * k);
65  }
66  }
67 
68  // compute cos or sin for current phase angle
69  float cos () const { return gr_fxpt::cos (d_phase); }
70  float sin () const { return gr_fxpt::sin (d_phase); }
71 };
72 
73 #endif /* INCLUDED_GR_FXPT_VCO_H */