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<h1>gri_agc_ff.h</h1>  </div>
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<a href="gri__agc__ff_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 2002,2006 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_FF_H</span>
<a name="l00024"></a>00024 <span class="preprocessor"></span><span class="preprocessor">#define INCLUDED_GRI_AGC_FF_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"> * Power is approximated by absolute value</span>
<a name="l00032"></a>00032 <span class="comment"> */</span>
<a name="l00033"></a><a class="code" href="classgri__agc__ff.html">00033</a> <span class="keyword">class </span><a class="code" href="classgri__agc__ff.html" title="high performance Automatic Gain Control class">gri_agc_ff</a> {
<a name="l00034"></a>00034 
<a name="l00035"></a>00035  <span class="keyword">public</span>:
<a name="l00036"></a><a class="code" href="classgri__agc__ff.html#a6a37d93547bce6f637fe741e5a68a55b">00036</a>   <a class="code" href="classgri__agc__ff.html#a6a37d93547bce6f637fe741e5a68a55b">gri_agc_ff</a> (<span class="keywordtype">float</span> <a class="code" href="classgri__agc__ff.html#acec6a2a2778e4fd8746d521d88c16df9">rate</a> = 1e-4, <span class="keywordtype">float</span> <a class="code" href="classgri__agc__ff.html#a3c86925a6be8e686ab22fc3fc5433f73">reference</a> = 1.0,
<a name="l00037"></a>00037               <span class="keywordtype">float</span> <a class="code" href="classgri__agc__ff.html#a8823aade27e387b5b44b45d13faefcb4">gain</a> = 1.0, <span class="keywordtype">float</span> <a class="code" href="classgri__agc__ff.html#af718da2149e650d8c47ba88bac6965c8">max_gain</a> = 0.0)
<a name="l00038"></a>00038     : <a class="code" href="classgri__agc__ff.html#ab66e127802a267002c1fa2bbe52e2b29">_rate</a>(<a class="code" href="classgri__agc__ff.html#acec6a2a2778e4fd8746d521d88c16df9">rate</a>), <a class="code" href="classgri__agc__ff.html#a6f644c07e2eb5da83ef7463b7254a84c">_reference</a>(<a class="code" href="classgri__agc__ff.html#a3c86925a6be8e686ab22fc3fc5433f73">reference</a>), <a class="code" href="classgri__agc__ff.html#a6c4339e60e22eabeed2f2bc8fb049502">_gain</a>(<a class="code" href="classgri__agc__ff.html#a8823aade27e387b5b44b45d13faefcb4">gain</a>), <a class="code" href="classgri__agc__ff.html#a727b4f656c8a37f92a94269b20103658">_max_gain</a>(<a class="code" href="classgri__agc__ff.html#af718da2149e650d8c47ba88bac6965c8">max_gain</a>) {};
<a name="l00039"></a>00039 
<a name="l00040"></a><a class="code" href="classgri__agc__ff.html#acec6a2a2778e4fd8746d521d88c16df9">00040</a>   <span class="keywordtype">float</span> <a class="code" href="classgri__agc__ff.html#acec6a2a2778e4fd8746d521d88c16df9">rate</a> ()<span class="keyword"> const      </span>{ <span class="keywordflow">return</span> <a class="code" href="classgri__agc__ff.html#ab66e127802a267002c1fa2bbe52e2b29">_rate</a>; }
<a name="l00041"></a><a class="code" href="classgri__agc__ff.html#a3c86925a6be8e686ab22fc3fc5433f73">00041</a>   <span class="keywordtype">float</span> <a class="code" href="classgri__agc__ff.html#a3c86925a6be8e686ab22fc3fc5433f73">reference</a> ()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> <a class="code" href="classgri__agc__ff.html#a6f644c07e2eb5da83ef7463b7254a84c">_reference</a>; }
<a name="l00042"></a><a class="code" href="classgri__agc__ff.html#a8823aade27e387b5b44b45d13faefcb4">00042</a>   <span class="keywordtype">float</span> <a class="code" href="classgri__agc__ff.html#a8823aade27e387b5b44b45d13faefcb4">gain</a> ()<span class="keyword"> const      </span>{ <span class="keywordflow">return</span> <a class="code" href="classgri__agc__ff.html#a6c4339e60e22eabeed2f2bc8fb049502">_gain</a>;  }
<a name="l00043"></a><a class="code" href="classgri__agc__ff.html#af718da2149e650d8c47ba88bac6965c8">00043</a>   <span class="keywordtype">float</span> <a class="code" href="classgri__agc__ff.html#af718da2149e650d8c47ba88bac6965c8">max_gain</a> ()<span class="keyword"> const  </span>{ <span class="keywordflow">return</span> <a class="code" href="classgri__agc__ff.html#a727b4f656c8a37f92a94269b20103658">_max_gain</a>; }
<a name="l00044"></a>00044   
<a name="l00045"></a><a class="code" href="classgri__agc__ff.html#a0faa33eebad5116c8bb55770afe24425">00045</a>   <span class="keywordtype">void</span> <a class="code" href="classgri__agc__ff.html#a0faa33eebad5116c8bb55770afe24425">set_rate</a> (<span class="keywordtype">float</span> <a class="code" href="classgri__agc__ff.html#acec6a2a2778e4fd8746d521d88c16df9">rate</a>) { <a class="code" href="classgri__agc__ff.html#ab66e127802a267002c1fa2bbe52e2b29">_rate</a> = <a class="code" href="classgri__agc__ff.html#acec6a2a2778e4fd8746d521d88c16df9">rate</a>; }
<a name="l00046"></a><a class="code" href="classgri__agc__ff.html#a486601c1d862e7dd2d5f646dad7aa026">00046</a>   <span class="keywordtype">void</span> <a class="code" href="classgri__agc__ff.html#a486601c1d862e7dd2d5f646dad7aa026">set_reference</a> (<span class="keywordtype">float</span> <a class="code" href="classgri__agc__ff.html#a3c86925a6be8e686ab22fc3fc5433f73">reference</a>) { <a class="code" href="classgri__agc__ff.html#a6f644c07e2eb5da83ef7463b7254a84c">_reference</a> = <a class="code" href="classgri__agc__ff.html#a3c86925a6be8e686ab22fc3fc5433f73">reference</a>; }
<a name="l00047"></a><a class="code" href="classgri__agc__ff.html#a7f8d27e626282427bf163728c805ef40">00047</a>   <span class="keywordtype">void</span> <a class="code" href="classgri__agc__ff.html#a7f8d27e626282427bf163728c805ef40">set_gain</a> (<span class="keywordtype">float</span> <a class="code" href="classgri__agc__ff.html#a8823aade27e387b5b44b45d13faefcb4">gain</a>) { <a class="code" href="classgri__agc__ff.html#a6c4339e60e22eabeed2f2bc8fb049502">_gain</a> = <a class="code" href="classgri__agc__ff.html#a8823aade27e387b5b44b45d13faefcb4">gain</a>; }
<a name="l00048"></a><a class="code" href="classgri__agc__ff.html#ae38654d026cf2e4634febc8acaa84c03">00048</a>   <span class="keywordtype">void</span> <a class="code" href="classgri__agc__ff.html#ae38654d026cf2e4634febc8acaa84c03">set_max_gain</a> (<span class="keywordtype">float</span> <a class="code" href="classgri__agc__ff.html#af718da2149e650d8c47ba88bac6965c8">max_gain</a>) { <a class="code" href="classgri__agc__ff.html#a727b4f656c8a37f92a94269b20103658">_max_gain</a> = <a class="code" href="classgri__agc__ff.html#af718da2149e650d8c47ba88bac6965c8">max_gain</a>; }
<a name="l00049"></a>00049   
<a name="l00050"></a><a class="code" href="classgri__agc__ff.html#a6f5ef887c62144816b05327614c3b74a">00050</a>   <span class="keywordtype">float</span> <a class="code" href="classgri__agc__ff.html#a6f5ef887c62144816b05327614c3b74a">scale</a> (<span class="keywordtype">float</span> input){
<a name="l00051"></a>00051     <span class="keywordtype">float</span> output = input * <a class="code" href="classgri__agc__ff.html#a6c4339e60e22eabeed2f2bc8fb049502">_gain</a>;
<a name="l00052"></a>00052     _gain += (<a class="code" href="classgri__agc__ff.html#a6f644c07e2eb5da83ef7463b7254a84c">_reference</a> - fabsf (output)) * <a class="code" href="classgri__agc__ff.html#ab66e127802a267002c1fa2bbe52e2b29">_rate</a>;
<a name="l00053"></a>00053     <span class="keywordflow">if</span> (<a class="code" href="classgri__agc__ff.html#a727b4f656c8a37f92a94269b20103658">_max_gain</a> &gt; 0.0 &amp;&amp; _gain &gt; <a class="code" href="classgri__agc__ff.html#a727b4f656c8a37f92a94269b20103658">_max_gain</a>)
<a name="l00054"></a>00054       _gain = <a class="code" href="classgri__agc__ff.html#a727b4f656c8a37f92a94269b20103658">_max_gain</a>;
<a name="l00055"></a>00055     <span class="keywordflow">return</span> output;
<a name="l00056"></a>00056   }
<a name="l00057"></a>00057 
<a name="l00058"></a><a class="code" href="classgri__agc__ff.html#a516257ff14a1d70b230773c0fdb7d77b">00058</a>   <span class="keywordtype">void</span> <a class="code" href="classgri__agc__ff.html#a516257ff14a1d70b230773c0fdb7d77b">scaleN</a> (<span class="keywordtype">float</span> output[], <span class="keyword">const</span> <span class="keywordtype">float</span> input[], <span class="keywordtype">unsigned</span> n){
<a name="l00059"></a>00059     <span class="keywordflow">for</span> (<span class="keywordtype">unsigned</span> i = 0; i &lt; n; i++)
<a name="l00060"></a>00060       output[i] = <a class="code" href="classgri__agc__ff.html#a6f5ef887c62144816b05327614c3b74a">scale</a> (input[i]);
<a name="l00061"></a>00061   }
<a name="l00062"></a>00062   
<a name="l00063"></a>00063  <span class="keyword">protected</span>:
<a name="l00064"></a><a class="code" href="classgri__agc__ff.html#ab66e127802a267002c1fa2bbe52e2b29">00064</a>   <span class="keywordtype">float</span> <a class="code" href="classgri__agc__ff.html#ab66e127802a267002c1fa2bbe52e2b29">_rate</a>;                  <span class="comment">// adjustment rate</span>
<a name="l00065"></a><a class="code" href="classgri__agc__ff.html#a6f644c07e2eb5da83ef7463b7254a84c">00065</a>   <span class="keywordtype">float</span> <a class="code" href="classgri__agc__ff.html#a6f644c07e2eb5da83ef7463b7254a84c">_reference</a>;             <span class="comment">// reference value</span>
<a name="l00066"></a><a class="code" href="classgri__agc__ff.html#a6c4339e60e22eabeed2f2bc8fb049502">00066</a>   <span class="keywordtype">float</span> <a class="code" href="classgri__agc__ff.html#a6c4339e60e22eabeed2f2bc8fb049502">_gain</a>;                  <span class="comment">// current gain</span>
<a name="l00067"></a><a class="code" href="classgri__agc__ff.html#a727b4f656c8a37f92a94269b20103658">00067</a>   <span class="keywordtype">float</span> <a class="code" href="classgri__agc__ff.html#a727b4f656c8a37f92a94269b20103658">_max_gain</a>;              <span class="comment">// maximum gain</span>
<a name="l00068"></a>00068 };
<a name="l00069"></a>00069 
<a name="l00070"></a>00070 <span class="preprocessor">#endif </span><span class="comment">/* INCLUDED_GRI_AGC_FF_H */</span>
<a name="l00071"></a>00071 
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