GNU Radio 3.6.5 C++ API

rotator.h

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00001 /* -*- c++ -*- */
00002 /*
00003  * Copyright 2003,2008,2013 Free Software Foundation, Inc.
00004  *
00005  * This file is part of GNU Radio
00006  *
00007  * GNU Radio is free software; you can redistribute it and/or modify
00008  * it under the terms of the GNU General Public License as published by
00009  * the Free Software Foundation; either version 3, or (at your option)
00010  * any later version.
00011  *
00012  * GNU Radio is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00015  * GNU General Public License for more details.
00016  *
00017  * You should have received a copy of the GNU General Public License
00018  * along with GNU Radio; see the file COPYING.  If not, write to
00019  * the Free Software Foundation, Inc., 51 Franklin Street,
00020  * Boston, MA 02110-1301, USA.
00021  */
00022 
00023 #ifndef _GR_ROTATOR_H_
00024 #define _GR_ROTATOR_H_
00025 
00026 #include <blocks/api.h>
00027 #include <gr_complex.h>
00028 
00029 namespace gr {
00030   namespace blocks {
00031 
00032     class rotator 
00033     {
00034     private:
00035       gr_complex d_phase;
00036       gr_complex d_phase_incr;
00037       unsigned int d_counter;
00038 
00039     public:
00040       rotator() : d_phase(1), d_phase_incr(1), d_counter(0)
00041         { }
00042 
00043       void set_phase(gr_complex phase) { d_phase = phase / abs(phase); }
00044       void set_phase_incr(gr_complex incr) { d_phase_incr = incr / abs(incr); }
00045 
00046       gr_complex rotate(gr_complex in)
00047       {
00048         d_counter++;
00049 
00050         gr_complex z = in * d_phase;    // rotate in by phase
00051         d_phase *= d_phase_incr;            // incr our phase (complex mult == add phases)
00052 
00053         if((d_counter % 512) == 0)
00054           d_phase /= abs(d_phase);          // Normalize to ensure multiplication is rotation
00055 
00056         return z;
00057       }
00058     };
00059 
00060   } /* namespace blocks */
00061 } /* namespace gr */
00062 
00063 #endif /* _GR_ROTATOR_H_ */