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<h1>gr_rotator.h</h1>  </div>
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<a href="gr__rotator_8h.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/* -*- c++ -*- */</span>
<a name="l00002"></a>00002 <span class="comment">/*</span>
<a name="l00003"></a>00003 <span class="comment"> * Copyright 2003,2008 Free Software Foundation, Inc.</span>
<a name="l00004"></a>00004 <span class="comment"> * </span>
<a name="l00005"></a>00005 <span class="comment"> * This file is part of GNU Radio</span>
<a name="l00006"></a>00006 <span class="comment"> * </span>
<a name="l00007"></a>00007 <span class="comment"> * GNU Radio is free software; you can redistribute it and/or modify</span>
<a name="l00008"></a>00008 <span class="comment"> * it under the terms of the GNU General Public License as published by</span>
<a name="l00009"></a>00009 <span class="comment"> * the Free Software Foundation; either version 3, or (at your option)</span>
<a name="l00010"></a>00010 <span class="comment"> * any later version.</span>
<a name="l00011"></a>00011 <span class="comment"> * </span>
<a name="l00012"></a>00012 <span class="comment"> * GNU Radio is distributed in the hope that it will be useful,</span>
<a name="l00013"></a>00013 <span class="comment"> * but WITHOUT ANY WARRANTY; without even the implied warranty of</span>
<a name="l00014"></a>00014 <span class="comment"> * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the</span>
<a name="l00015"></a>00015 <span class="comment"> * GNU General Public License for more details.</span>
<a name="l00016"></a>00016 <span class="comment"> * </span>
<a name="l00017"></a>00017 <span class="comment"> * You should have received a copy of the GNU General Public License</span>
<a name="l00018"></a>00018 <span class="comment"> * along with GNU Radio; see the file COPYING.  If not, write to</span>
<a name="l00019"></a>00019 <span class="comment"> * the Free Software Foundation, Inc., 51 Franklin Street,</span>
<a name="l00020"></a>00020 <span class="comment"> * Boston, MA 02110-1301, USA.</span>
<a name="l00021"></a>00021 <span class="comment"> */</span>
<a name="l00022"></a>00022 
<a name="l00023"></a>00023 <span class="preprocessor">#ifndef _GR_ROTATOR_H_</span>
<a name="l00024"></a>00024 <span class="preprocessor"></span><span class="preprocessor">#define _GR_ROTATOR_H_</span>
<a name="l00025"></a>00025 <span class="preprocessor"></span>
<a name="l00026"></a>00026 <span class="preprocessor">#include &lt;gr_complex.h&gt;</span>
<a name="l00027"></a>00027 
<a name="l00028"></a><a class="code" href="classgr__rotator.html">00028</a> <span class="keyword">class </span><a class="code" href="classgr__rotator.html">gr_rotator</a> {
<a name="l00029"></a>00029   <a class="code" href="gr__complex_8h.html#aec4bfe41433369afae9327f1b0bc9109">gr_complex</a>    d_phase;
<a name="l00030"></a>00030   <a class="code" href="gr__complex_8h.html#aec4bfe41433369afae9327f1b0bc9109">gr_complex</a>    d_phase_incr;
<a name="l00031"></a>00031   <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span>  d_counter;
<a name="l00032"></a>00032 
<a name="l00033"></a>00033  <span class="keyword">public</span>:
<a name="l00034"></a><a class="code" href="classgr__rotator.html#a3de166054871406c8bc334e0b1e3b4e9">00034</a>   <a class="code" href="classgr__rotator.html#a3de166054871406c8bc334e0b1e3b4e9">gr_rotator</a> () : d_phase (1), d_phase_incr (1), d_counter(0) { }
<a name="l00035"></a>00035 
<a name="l00036"></a><a class="code" href="classgr__rotator.html#aa518f379c0b0786a3ef7c7f857836de8">00036</a>   <span class="keywordtype">void</span> <a class="code" href="classgr__rotator.html#aa518f379c0b0786a3ef7c7f857836de8">set_phase</a> (<a class="code" href="gr__complex_8h.html#aec4bfe41433369afae9327f1b0bc9109">gr_complex</a> phase)     { d_phase = phase / abs(phase); }
<a name="l00037"></a><a class="code" href="classgr__rotator.html#a103c9129edbc45c9932fa90baf28dc58">00037</a>   <span class="keywordtype">void</span> <a class="code" href="classgr__rotator.html#a103c9129edbc45c9932fa90baf28dc58">set_phase_incr</a> (<a class="code" href="gr__complex_8h.html#aec4bfe41433369afae9327f1b0bc9109">gr_complex</a> incr) { d_phase_incr = incr / abs(incr); }
<a name="l00038"></a>00038 
<a name="l00039"></a><a class="code" href="classgr__rotator.html#ab9263b2b3aa22c6d7a10df2d9439dffb">00039</a>   <a class="code" href="gr__complex_8h.html#aec4bfe41433369afae9327f1b0bc9109">gr_complex</a> <a class="code" href="classgr__rotator.html#ab9263b2b3aa22c6d7a10df2d9439dffb">rotate</a> (<a class="code" href="gr__complex_8h.html#aec4bfe41433369afae9327f1b0bc9109">gr_complex</a> in){
<a name="l00040"></a>00040     d_counter++;
<a name="l00041"></a>00041 
<a name="l00042"></a>00042     <a class="code" href="gr__complex_8h.html#aec4bfe41433369afae9327f1b0bc9109">gr_complex</a> z = in * d_phase;    <span class="comment">// rotate in by phase</span>
<a name="l00043"></a>00043     d_phase *= d_phase_incr;        <span class="comment">// incr our phase (complex mult == add phases)</span>
<a name="l00044"></a>00044 
<a name="l00045"></a>00045     <span class="keywordflow">if</span> ((d_counter % 512) == 0)
<a name="l00046"></a>00046       d_phase /= abs(d_phase);      <span class="comment">// Normalize to ensure multiplication is rotation</span>
<a name="l00047"></a>00047 
<a name="l00048"></a>00048     <span class="keywordflow">return</span> z;
<a name="l00049"></a>00049   }
<a name="l00050"></a>00050 
<a name="l00051"></a>00051 };
<a name="l00052"></a>00052 
<a name="l00053"></a>00053 <span class="preprocessor">#endif </span><span class="comment">/* _GR_ROTATOR_H_ */</span>
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