GNU Radio 3.6.4 C++ API
gr_rotator.h
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1 /* -*- c++ -*- */
2 /*
3  * Copyright 2003,2008 Free Software Foundation, Inc.
4  *
5  * This file is part of GNU Radio
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22 
23 #ifndef _GR_ROTATOR_H_
24 #define _GR_ROTATOR_H_
25 
26 #include <gr_core_api.h>
27 #include <gr_complex.h>
28 
30  gr_complex d_phase;
31  gr_complex d_phase_incr;
32  unsigned int d_counter;
33 
34  public:
35  gr_rotator () : d_phase (1), d_phase_incr (1), d_counter(0) { }
36 
37  void set_phase (gr_complex phase) { d_phase = phase / abs(phase); }
38  void set_phase_incr (gr_complex incr) { d_phase_incr = incr / abs(incr); }
39 
41  d_counter++;
42 
43  gr_complex z = in * d_phase; // rotate in by phase
44  d_phase *= d_phase_incr; // incr our phase (complex mult == add phases)
45 
46  if ((d_counter % 512) == 0)
47  d_phase /= abs(d_phase); // Normalize to ensure multiplication is rotation
48 
49  return z;
50  }
51 
52 };
53 
54 #endif /* _GR_ROTATOR_H_ */