GNU Radio Manual and C++ API Reference  3.7.9.2
The Free & Open Software Radio Ecosystem
 All Classes Namespaces Files Functions Variables Typedefs Enumerations Enumerator Friends Macros Modules Pages
fxpt_vco.h
Go to the documentation of this file.
1 /* -*- c++ -*- */
2 /*
3  * Copyright 2002,2004,2005,2013 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 INCLUDED_GR_FXPT_VCO_H
24 #define INCLUDED_GR_FXPT_VCO_H
25 
26 #include <gnuradio/api.h>
27 #include <gnuradio/fxpt.h>
28 #include <gnuradio/gr_complex.h>
29 
30 namespace gr {
31 
32  /*!
33  * \brief Voltage Controlled Oscillator (VCO)
34  * \ingroup misc
35  */
36  class /*GR_RUNTIME_API*/ fxpt_vco {
37  int32_t d_phase;
38 
39  public:
40  fxpt_vco () : d_phase(0) {}
41 
42  ~fxpt_vco() {}
43 
44  // radians
45  void set_phase(float angle) {
46  d_phase = fxpt::float_to_fixed(angle);
47  }
48 
49  void adjust_phase(float delta_phase) {
50  d_phase += fxpt::float_to_fixed(delta_phase);
51  }
52 
53  float get_phase() const {
54  return fxpt::fixed_to_float(d_phase);
55  }
56 
57  // compute sin and cos for current phase angle
58  void sincos(float *sinx, float *cosx) const
59  {
60  *sinx = fxpt::sin(d_phase);
61  *cosx = fxpt::cos(d_phase);
62  }
63 
64  // compute complex sine a block at a time
65  void sincos(gr_complex *output, const float *input, int noutput_items,
66  float k, float ampl = 1.0)
67  {
68  for(int i = 0; i < noutput_items; i++) {
69  output[i] = gr_complex((float)(fxpt::cos(d_phase) * ampl),
70  (float)(fxpt::sin(d_phase) * ampl));
71  adjust_phase(input[i] * k);
72  }
73  }
74 
75  // compute a block at a time
76  void cos(float *output, const float *input, int noutput_items, float k, float ampl = 1.0)
77  {
78  for(int i = 0; i < noutput_items; i++) {
79  output[i] = (float)(fxpt::cos(d_phase) * ampl);
80  adjust_phase(input[i] * k);
81  }
82  }
83 
84  // compute cos or sin for current phase angle
85  float cos() const { return fxpt::cos(d_phase); }
86  float sin() const { return fxpt::sin(d_phase); }
87  };
88 
89 } /* namespace gr */
90 
91 #endif /* INCLUDED_GR_FXPT_VCO_H */
void adjust_phase(float delta_phase)
Definition: fxpt_vco.h:49
Voltage Controlled Oscillator (VCO)
Definition: fxpt_vco.h:36
fxpt_vco()
Definition: fxpt_vco.h:40
float cos() const
Definition: fxpt_vco.h:85
~fxpt_vco()
Definition: fxpt_vco.h:42
void sincos(gr_complex *output, const float *input, int noutput_items, float k, float ampl=1.0)
Definition: fxpt_vco.h:65
float sin() const
Definition: fxpt_vco.h:86
float get_phase() const
Definition: fxpt_vco.h:53
std::complex< float > gr_complex
Definition: gr_complex.h:27
static float cos(int32_t x)
Definition: fxpt.h:82
Include this header to use the message passing features.
Definition: logger.h:131
static float sin(int32_t x)
Given a fixed point angle x, return float sine (x)
Definition: fxpt.h:71
static float fixed_to_float(int32_t x)
Definition: fxpt.h:62
void sincos(float *sinx, float *cosx) const
Definition: fxpt_vco.h:58
static int32_t float_to_fixed(float x)
Definition: fxpt.h:52
void cos(float *output, const float *input, int noutput_items, float k, float ampl=1.0)
Definition: fxpt_vco.h:76
void set_phase(float angle)
Definition: fxpt_vco.h:45