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<h1>gr_vco.h</h1>  </div>
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<a href="gr__vco_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 2005 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 <span class="preprocessor">#ifndef _GR_VCO_H_</span>
<a name="l00023"></a>00023 <span class="preprocessor"></span><span class="preprocessor">#define _GR_VCO_H_</span>
<a name="l00024"></a>00024 <span class="preprocessor"></span>
<a name="l00025"></a>00025 
<a name="l00026"></a>00026 <span class="preprocessor">#include &lt;vector&gt;</span>
<a name="l00027"></a>00027 <span class="preprocessor">#include &lt;gr_sincos.h&gt;</span>
<a name="l00028"></a>00028 <span class="preprocessor">#include &lt;cmath&gt;</span>
<a name="l00029"></a>00029 <span class="preprocessor">#include &lt;gr_complex.h&gt;</span>
<a name="l00030"></a>00030 <span class="comment"></span>
<a name="l00031"></a>00031 <span class="comment">/*!</span>
<a name="l00032"></a>00032 <span class="comment"> * \brief base class template for Voltage Controlled Oscillator (VCO)</span>
<a name="l00033"></a>00033 <span class="comment"> * \ingroup misc</span>
<a name="l00034"></a>00034 <span class="comment"> */</span>
<a name="l00035"></a>00035 
<a name="l00036"></a>00036 <span class="comment">//FIXME  Eventually generalize this to fixed point</span>
<a name="l00037"></a>00037 
<a name="l00038"></a>00038 <span class="keyword">template</span>&lt;<span class="keyword">class</span> o_type, <span class="keyword">class</span> i_type&gt; 
<a name="l00039"></a><a class="code" href="classgr__vco.html">00039</a> <span class="keyword">class </span><a class="code" href="classgr__vco.html" title="base class template for Voltage Controlled Oscillator (VCO)">gr_vco</a> {
<a name="l00040"></a>00040 <span class="keyword">public</span>:
<a name="l00041"></a><a class="code" href="classgr__vco.html#a9cf6ab94f646564983f350a69baa8e53">00041</a>   <a class="code" href="classgr__vco.html#a9cf6ab94f646564983f350a69baa8e53">gr_vco</a> () : <a class="code" href="classgr__vco.html#a0d1b9fc482a8c6d701c0382b799fe11a">d_phase</a> (0) {}
<a name="l00042"></a>00042 
<a name="l00043"></a><a class="code" href="classgr__vco.html#ac44432708e327dde927a5eed71cea7e5">00043</a>   <span class="keyword">virtual</span> <a class="code" href="classgr__vco.html#ac44432708e327dde927a5eed71cea7e5">~gr_vco</a> () {}
<a name="l00044"></a>00044 
<a name="l00045"></a>00045   <span class="comment">// radians</span>
<a name="l00046"></a><a class="code" href="classgr__vco.html#ac0f4048f34ed88f1c32e16a1c5d89f12">00046</a>   <span class="keywordtype">void</span> <a class="code" href="classgr__vco.html#ac0f4048f34ed88f1c32e16a1c5d89f12">set_phase</a> (<span class="keywordtype">double</span> angle) {
<a name="l00047"></a>00047     <a class="code" href="classgr__vco.html#a0d1b9fc482a8c6d701c0382b799fe11a">d_phase</a> = angle;
<a name="l00048"></a>00048   }
<a name="l00049"></a>00049 
<a name="l00050"></a><a class="code" href="classgr__vco.html#a9369c68b68aa73498cd23d74cdfc5f99">00050</a>   <span class="keywordtype">void</span> <a class="code" href="classgr__vco.html#a9369c68b68aa73498cd23d74cdfc5f99">adjust_phase</a> (<span class="keywordtype">double</span> delta_phase) {
<a name="l00051"></a>00051     <a class="code" href="classgr__vco.html#a0d1b9fc482a8c6d701c0382b799fe11a">d_phase</a> += delta_phase;
<a name="l00052"></a>00052     <span class="keywordflow">if</span> (fabs (<a class="code" href="classgr__vco.html#a0d1b9fc482a8c6d701c0382b799fe11a">d_phase</a>) &gt; M_PI){
<a name="l00053"></a>00053       
<a name="l00054"></a>00054       <span class="keywordflow">while</span> (<a class="code" href="classgr__vco.html#a0d1b9fc482a8c6d701c0382b799fe11a">d_phase</a> &gt; M_PI)
<a name="l00055"></a>00055         <a class="code" href="classgr__vco.html#a0d1b9fc482a8c6d701c0382b799fe11a">d_phase</a> -= 2*M_PI;
<a name="l00056"></a>00056 
<a name="l00057"></a>00057       <span class="keywordflow">while</span> (<a class="code" href="classgr__vco.html#a0d1b9fc482a8c6d701c0382b799fe11a">d_phase</a> &lt; -M_PI)
<a name="l00058"></a>00058         <a class="code" href="classgr__vco.html#a0d1b9fc482a8c6d701c0382b799fe11a">d_phase</a> += 2*M_PI;
<a name="l00059"></a>00059     }
<a name="l00060"></a>00060   }
<a name="l00061"></a>00061 
<a name="l00062"></a><a class="code" href="classgr__vco.html#a38f19c7a8f164c011041a18e242112d8">00062</a>   <span class="keywordtype">double</span> <a class="code" href="classgr__vco.html#a38f19c7a8f164c011041a18e242112d8">get_phase</a> ()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> <a class="code" href="classgr__vco.html#a0d1b9fc482a8c6d701c0382b799fe11a">d_phase</a>; }
<a name="l00063"></a>00063 
<a name="l00064"></a>00064   <span class="comment">// compute sin and cos for current phase angle</span>
<a name="l00065"></a>00065   <span class="keywordtype">void</span> <a class="code" href="classgr__vco.html#a8fa1bae038a73276062fdae2b92fff89">sincos</a> (<span class="keywordtype">float</span> *sinx, <span class="keywordtype">float</span> *cosx) <span class="keyword">const</span>;
<a name="l00066"></a>00066 
<a name="l00067"></a>00067   <span class="comment">// compute cos or sin for current phase angle</span>
<a name="l00068"></a><a class="code" href="classgr__vco.html#a58b8420209f0c315278e5d5feaefa5fa">00068</a>   <span class="keywordtype">float</span> <a class="code" href="classgr__vco.html#a58b8420209f0c315278e5d5feaefa5fa">cos</a> ()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> <a class="code" href="classgr__vco.html#a58b8420209f0c315278e5d5feaefa5fa">std::cos</a> (<a class="code" href="classgr__vco.html#a0d1b9fc482a8c6d701c0382b799fe11a">d_phase</a>); }
<a name="l00069"></a><a class="code" href="classgr__vco.html#a2458956261a471194fcfa3594848bb3f">00069</a>   <span class="keywordtype">float</span> <a class="code" href="classgr__vco.html#a2458956261a471194fcfa3594848bb3f">sin</a> ()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> <a class="code" href="classgr__vco.html#a2458956261a471194fcfa3594848bb3f">std::sin</a> (<a class="code" href="classgr__vco.html#a0d1b9fc482a8c6d701c0382b799fe11a">d_phase</a>); }
<a name="l00070"></a>00070 
<a name="l00071"></a>00071   <span class="comment">// compute a block at a time</span>
<a name="l00072"></a>00072   <span class="keywordtype">void</span> <a class="code" href="classgr__vco.html#a58b8420209f0c315278e5d5feaefa5fa">cos</a> (<span class="keywordtype">float</span> *output, <span class="keyword">const</span> <span class="keywordtype">float</span> *input, <span class="keywordtype">int</span> noutput_items, <span class="keywordtype">double</span> k, <span class="keywordtype">double</span> ampl = 1.0);
<a name="l00073"></a>00073 
<a name="l00074"></a>00074 <span class="keyword">protected</span>:
<a name="l00075"></a><a class="code" href="classgr__vco.html#a0d1b9fc482a8c6d701c0382b799fe11a">00075</a>   <span class="keywordtype">double</span> <a class="code" href="classgr__vco.html#a0d1b9fc482a8c6d701c0382b799fe11a">d_phase</a>;
<a name="l00076"></a>00076 };
<a name="l00077"></a>00077 
<a name="l00078"></a>00078 <span class="keyword">template</span>&lt;<span class="keyword">class</span> o_type, <span class="keyword">class</span> i_type&gt; 
<a name="l00079"></a>00079 <span class="keywordtype">void</span>
<a name="l00080"></a><a class="code" href="classgr__vco.html#a8fa1bae038a73276062fdae2b92fff89">00080</a> <a class="code" href="classgr__vco.html#a8fa1bae038a73276062fdae2b92fff89">gr_vco&lt;o_type,i_type&gt;::sincos</a> (<span class="keywordtype">float</span> *sinx, <span class="keywordtype">float</span> *cosx)<span class="keyword"> const</span>
<a name="l00081"></a>00081 <span class="keyword"></span>{
<a name="l00082"></a>00082   <a class="code" href="gr__sincos_8h.html#a1233daa4d05a54c9ce6de62039ca4ddc">gr_sincosf</a> (d_phase, sinx, cosx);
<a name="l00083"></a>00083 }
<a name="l00084"></a>00084 
<a name="l00085"></a>00085 <span class="keyword">template</span>&lt;<span class="keyword">class</span> o_type, <span class="keyword">class</span> i_type&gt; 
<a name="l00086"></a>00086 <span class="keywordtype">void</span>
<a name="l00087"></a><a class="code" href="classgr__vco.html#a2a686b0a311611167414e7747a67cabf">00087</a> <a class="code" href="classgr__vco.html#a58b8420209f0c315278e5d5feaefa5fa">gr_vco&lt;o_type,i_type&gt;::cos</a> (<span class="keywordtype">float</span> *output, <span class="keyword">const</span> <span class="keywordtype">float</span> *input, <span class="keywordtype">int</span> noutput_items, <span class="keywordtype">double</span> k, <span class="keywordtype">double</span> ampl)
<a name="l00088"></a>00088 {
<a name="l00089"></a>00089   <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i &lt; noutput_items; i++){
<a name="l00090"></a>00090     output[i] = cos() * ampl;
<a name="l00091"></a>00091     adjust_phase(input[i] * k);
<a name="l00092"></a>00092   }
<a name="l00093"></a>00093 }
<a name="l00094"></a>00094 <span class="preprocessor">#endif </span><span class="comment">/* _GR_VCO_H_ */</span>
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