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<h1>gri_agc_cc.h</h1>  </div>
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<a href="gri__agc__cc_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 2006 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 INCLUDED_GRI_AGC_CC_H</span>
<a name="l00024"></a>00024 <span class="preprocessor"></span><span class="preprocessor">#define INCLUDED_GRI_AGC_CC_H</span>
<a name="l00025"></a>00025 <span class="preprocessor"></span>
<a name="l00026"></a>00026 <span class="preprocessor">#include &lt;math.h&gt;</span>
<a name="l00027"></a>00027 <span class="comment"></span>
<a name="l00028"></a>00028 <span class="comment">/*!</span>
<a name="l00029"></a>00029 <span class="comment"> * \brief high performance Automatic Gain Control class</span>
<a name="l00030"></a>00030 <span class="comment"> *</span>
<a name="l00031"></a>00031 <span class="comment"> * For Power the absolute value of the complex number is used.</span>
<a name="l00032"></a>00032 <span class="comment"> */</span>
<a name="l00033"></a>00033 
<a name="l00034"></a><a class="code" href="classgri__agc__cc.html">00034</a> <span class="keyword">class </span><a class="code" href="classgri__agc__cc.html" title="high performance Automatic Gain Control class">gri_agc_cc</a> {
<a name="l00035"></a>00035 
<a name="l00036"></a>00036  <span class="keyword">public</span>:
<a name="l00037"></a><a class="code" href="classgri__agc__cc.html#a289fd86c352e4f7d29a262acd5d91c64">00037</a>   <a class="code" href="classgri__agc__cc.html#a289fd86c352e4f7d29a262acd5d91c64">gri_agc_cc</a> (<span class="keywordtype">float</span> <a class="code" href="classgri__agc__cc.html#ac7bf50c46a7f4c9750594f53f20df731">rate</a> = 1e-4, <span class="keywordtype">float</span> <a class="code" href="classgri__agc__cc.html#a000e10b591cf7e4a56043f2542608b45">reference</a> = 1.0, 
<a name="l00038"></a>00038               <span class="keywordtype">float</span> <a class="code" href="classgri__agc__cc.html#a23b4bef23e09133d352096c2ffb20814">gain</a> = 1.0, <span class="keywordtype">float</span> <a class="code" href="classgri__agc__cc.html#ad686fd713a7c58e93c8f8c2d11076960">max_gain</a> = 0.0)
<a name="l00039"></a>00039     : <a class="code" href="classgri__agc__cc.html#a780e7cc06eb312f481595fd96a0ab4c8">_rate</a>(<a class="code" href="classgri__agc__cc.html#ac7bf50c46a7f4c9750594f53f20df731">rate</a>), <a class="code" href="classgri__agc__cc.html#a9393e1d3305e194683cc9bbeac5cd958">_reference</a>(<a class="code" href="classgri__agc__cc.html#a000e10b591cf7e4a56043f2542608b45">reference</a>),
<a name="l00040"></a>00040       <a class="code" href="classgri__agc__cc.html#acdbbec6fd48d9a1718519e91c8e92eab">_gain</a>(<a class="code" href="classgri__agc__cc.html#a23b4bef23e09133d352096c2ffb20814">gain</a>), <a class="code" href="classgri__agc__cc.html#aa3138ae9a324a76f6631af0cdb564d4e">_max_gain</a>(<a class="code" href="classgri__agc__cc.html#ad686fd713a7c58e93c8f8c2d11076960">max_gain</a>) {};
<a name="l00041"></a>00041 
<a name="l00042"></a><a class="code" href="classgri__agc__cc.html#ac7bf50c46a7f4c9750594f53f20df731">00042</a>   <span class="keywordtype">float</span> <a class="code" href="classgri__agc__cc.html#ac7bf50c46a7f4c9750594f53f20df731">rate</a> ()<span class="keyword"> const      </span>{ <span class="keywordflow">return</span> <a class="code" href="classgri__agc__cc.html#a780e7cc06eb312f481595fd96a0ab4c8">_rate</a>; }
<a name="l00043"></a><a class="code" href="classgri__agc__cc.html#a000e10b591cf7e4a56043f2542608b45">00043</a>   <span class="keywordtype">float</span> <a class="code" href="classgri__agc__cc.html#a000e10b591cf7e4a56043f2542608b45">reference</a> ()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> <a class="code" href="classgri__agc__cc.html#a9393e1d3305e194683cc9bbeac5cd958">_reference</a>; }
<a name="l00044"></a><a class="code" href="classgri__agc__cc.html#a23b4bef23e09133d352096c2ffb20814">00044</a>   <span class="keywordtype">float</span> <a class="code" href="classgri__agc__cc.html#a23b4bef23e09133d352096c2ffb20814">gain</a> ()<span class="keyword"> const      </span>{ <span class="keywordflow">return</span> <a class="code" href="classgri__agc__cc.html#acdbbec6fd48d9a1718519e91c8e92eab">_gain</a>;  }
<a name="l00045"></a><a class="code" href="classgri__agc__cc.html#ad686fd713a7c58e93c8f8c2d11076960">00045</a>   <span class="keywordtype">float</span> <a class="code" href="classgri__agc__cc.html#ad686fd713a7c58e93c8f8c2d11076960">max_gain</a>()<span class="keyword"> const   </span>{ <span class="keywordflow">return</span> <a class="code" href="classgri__agc__cc.html#aa3138ae9a324a76f6631af0cdb564d4e">_max_gain</a>; }
<a name="l00046"></a>00046 
<a name="l00047"></a><a class="code" href="classgri__agc__cc.html#a0c29ac4bbd8e9fd38b014bd81ce0ba26">00047</a>   <span class="keywordtype">void</span> <a class="code" href="classgri__agc__cc.html#a0c29ac4bbd8e9fd38b014bd81ce0ba26">set_rate</a> (<span class="keywordtype">float</span> <a class="code" href="classgri__agc__cc.html#ac7bf50c46a7f4c9750594f53f20df731">rate</a>) { <a class="code" href="classgri__agc__cc.html#a780e7cc06eb312f481595fd96a0ab4c8">_rate</a> = <a class="code" href="classgri__agc__cc.html#ac7bf50c46a7f4c9750594f53f20df731">rate</a>; }
<a name="l00048"></a><a class="code" href="classgri__agc__cc.html#aafe2ae875b8057005f7fa12919846c75">00048</a>   <span class="keywordtype">void</span> <a class="code" href="classgri__agc__cc.html#aafe2ae875b8057005f7fa12919846c75">set_reference</a> (<span class="keywordtype">float</span> <a class="code" href="classgri__agc__cc.html#a000e10b591cf7e4a56043f2542608b45">reference</a>) { <a class="code" href="classgri__agc__cc.html#a9393e1d3305e194683cc9bbeac5cd958">_reference</a> = <a class="code" href="classgri__agc__cc.html#a000e10b591cf7e4a56043f2542608b45">reference</a>; }
<a name="l00049"></a><a class="code" href="classgri__agc__cc.html#a670964c35b7d565cc4f8548907dee847">00049</a>   <span class="keywordtype">void</span> <a class="code" href="classgri__agc__cc.html#a670964c35b7d565cc4f8548907dee847">set_gain</a> (<span class="keywordtype">float</span> <a class="code" href="classgri__agc__cc.html#a23b4bef23e09133d352096c2ffb20814">gain</a>) { <a class="code" href="classgri__agc__cc.html#acdbbec6fd48d9a1718519e91c8e92eab">_gain</a> = <a class="code" href="classgri__agc__cc.html#a23b4bef23e09133d352096c2ffb20814">gain</a>; }
<a name="l00050"></a><a class="code" href="classgri__agc__cc.html#aab963acbfaa924a1227f745307e67905">00050</a>   <span class="keywordtype">void</span> <a class="code" href="classgri__agc__cc.html#aab963acbfaa924a1227f745307e67905">set_max_gain</a>(<span class="keywordtype">float</span> <a class="code" href="classgri__agc__cc.html#ad686fd713a7c58e93c8f8c2d11076960">max_gain</a>) { <a class="code" href="classgri__agc__cc.html#aa3138ae9a324a76f6631af0cdb564d4e">_max_gain</a> = <a class="code" href="classgri__agc__cc.html#ad686fd713a7c58e93c8f8c2d11076960">max_gain</a>; }
<a name="l00051"></a>00051 
<a name="l00052"></a><a class="code" href="classgri__agc__cc.html#a3a6eb679f0dfa459e94dd5c99fc842f0">00052</a>   <a class="code" href="gr__complex_8h.html#aec4bfe41433369afae9327f1b0bc9109">gr_complex</a> <a class="code" href="classgri__agc__cc.html#a3a6eb679f0dfa459e94dd5c99fc842f0">scale</a> (<a class="code" href="gr__complex_8h.html#aec4bfe41433369afae9327f1b0bc9109">gr_complex</a> input){
<a name="l00053"></a>00053     <a class="code" href="gr__complex_8h.html#aec4bfe41433369afae9327f1b0bc9109">gr_complex</a> output = input * <a class="code" href="classgri__agc__cc.html#acdbbec6fd48d9a1718519e91c8e92eab">_gain</a>;
<a name="l00054"></a>00054     
<a name="l00055"></a>00055     _gain +=  <a class="code" href="classgri__agc__cc.html#a780e7cc06eb312f481595fd96a0ab4c8">_rate</a> * (<a class="code" href="classgri__agc__cc.html#a9393e1d3305e194683cc9bbeac5cd958">_reference</a> - sqrt(output.real()*output.real() + 
<a name="l00056"></a>00056                                          output.imag()*output.imag()));
<a name="l00057"></a>00057     <span class="keywordflow">if</span> (<a class="code" href="classgri__agc__cc.html#aa3138ae9a324a76f6631af0cdb564d4e">_max_gain</a> &gt; 0.0 &amp;&amp; _gain &gt; <a class="code" href="classgri__agc__cc.html#aa3138ae9a324a76f6631af0cdb564d4e">_max_gain</a>)
<a name="l00058"></a>00058        _gain = <a class="code" href="classgri__agc__cc.html#aa3138ae9a324a76f6631af0cdb564d4e">_max_gain</a>;                                                    
<a name="l00059"></a>00059     <span class="keywordflow">return</span> output;
<a name="l00060"></a>00060   }
<a name="l00061"></a>00061 
<a name="l00062"></a><a class="code" href="classgri__agc__cc.html#af17c36b0d622b93d411c56fc186f44c6">00062</a>   <span class="keywordtype">void</span> <a class="code" href="classgri__agc__cc.html#af17c36b0d622b93d411c56fc186f44c6">scaleN</a> (<a class="code" href="gr__complex_8h.html#aec4bfe41433369afae9327f1b0bc9109">gr_complex</a> output[], <span class="keyword">const</span> <a class="code" href="gr__complex_8h.html#aec4bfe41433369afae9327f1b0bc9109">gr_complex</a> input[], <span class="keywordtype">unsigned</span> n){
<a name="l00063"></a>00063     <span class="keywordflow">for</span> (<span class="keywordtype">unsigned</span> i = 0; i &lt; n; i++)
<a name="l00064"></a>00064       output[i] = <a class="code" href="classgri__agc__cc.html#a3a6eb679f0dfa459e94dd5c99fc842f0">scale</a> (input[i]);
<a name="l00065"></a>00065   }
<a name="l00066"></a>00066   
<a name="l00067"></a>00067  <span class="keyword">protected</span>:
<a name="l00068"></a><a class="code" href="classgri__agc__cc.html#a780e7cc06eb312f481595fd96a0ab4c8">00068</a>   <span class="keywordtype">float</span> <a class="code" href="classgri__agc__cc.html#a780e7cc06eb312f481595fd96a0ab4c8">_rate</a>;                  <span class="comment">// adjustment rate</span>
<a name="l00069"></a><a class="code" href="classgri__agc__cc.html#a9393e1d3305e194683cc9bbeac5cd958">00069</a>   <span class="keywordtype">float</span> <a class="code" href="classgri__agc__cc.html#a9393e1d3305e194683cc9bbeac5cd958">_reference</a>;             <span class="comment">// reference value</span>
<a name="l00070"></a><a class="code" href="classgri__agc__cc.html#acdbbec6fd48d9a1718519e91c8e92eab">00070</a>   <span class="keywordtype">float</span> <a class="code" href="classgri__agc__cc.html#acdbbec6fd48d9a1718519e91c8e92eab">_gain</a>;                  <span class="comment">// current gain</span>
<a name="l00071"></a><a class="code" href="classgri__agc__cc.html#aa3138ae9a324a76f6631af0cdb564d4e">00071</a>   <span class="keywordtype">float</span> <a class="code" href="classgri__agc__cc.html#aa3138ae9a324a76f6631af0cdb564d4e">_max_gain</a>;              <span class="comment">// max allowable gain</span>
<a name="l00072"></a>00072 };
<a name="l00073"></a>00073 
<a name="l00074"></a>00074 <span class="preprocessor">#endif </span><span class="comment">/* INCLUDED_GRI_AGC_CC_H */</span>
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