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<h1>gri_agc2_ff.h</h1> </div>
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<a href="gri__agc2__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 _GRI_AGC2_FF_H_</span>
<a name="l00024"></a>00024 <span class="preprocessor"></span><span class="preprocessor">#define _GRI_AGC2_FF_H_</span>
<a name="l00025"></a>00025 <span class="preprocessor"></span>
<a name="l00026"></a>00026 <span class="preprocessor">#include <math.h></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 with attack and decay rate</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>00033
<a name="l00034"></a><a class="code" href="classgri__agc2__ff.html">00034</a> <span class="keyword">class </span><a class="code" href="classgri__agc2__ff.html" title="high performance Automatic Gain Control class with attack and decay rate">gri_agc2_ff</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__agc2__ff.html#ab057504ad0053c33ca4d9bad0c5b1868">00037</a> <a class="code" href="classgri__agc2__ff.html#ab057504ad0053c33ca4d9bad0c5b1868">gri_agc2_ff</a> (<span class="keywordtype">float</span> <a class="code" href="classgri__agc2__ff.html#ab71f2b30849017047dd8a5195b545139">attack_rate</a> = 1e-1, <span class="keywordtype">float</span> <a class="code" href="classgri__agc2__ff.html#aef4665005d82da2e0d0251637b641256">decay_rate</a> = 1e-2, <span class="keywordtype">float</span> <a class="code" href="classgri__agc2__ff.html#a48ef18e97cd468fbb7ddd2d0d03cf239">reference</a> = 1.0,
<a name="l00038"></a>00038 <span class="keywordtype">float</span> <a class="code" href="classgri__agc2__ff.html#ab1655af168460935adf7187c33a52443">gain</a> = 1.0, <span class="keywordtype">float</span> <a class="code" href="classgri__agc2__ff.html#a620cdd0ff301b21812e5a900261add68">max_gain</a> = 0.0)
<a name="l00039"></a>00039 : <a class="code" href="classgri__agc2__ff.html#a5392044533465105cd05b1913062e257">_attack_rate</a>(<a class="code" href="classgri__agc2__ff.html#ab71f2b30849017047dd8a5195b545139">attack_rate</a>), <a class="code" href="classgri__agc2__ff.html#a087b22a47a1c8fc809ce078539ddc381">_decay_rate</a>(<a class="code" href="classgri__agc2__ff.html#aef4665005d82da2e0d0251637b641256">decay_rate</a>), <a class="code" href="classgri__agc2__ff.html#a7c9d778b2295af6dd1876b15d1a4d3ad">_reference</a>(<a class="code" href="classgri__agc2__ff.html#a48ef18e97cd468fbb7ddd2d0d03cf239">reference</a>),
<a name="l00040"></a>00040 <a class="code" href="classgri__agc2__ff.html#ade496b0213db856bccba66a0ae5a6055">_gain</a>(<a class="code" href="classgri__agc2__ff.html#ab1655af168460935adf7187c33a52443">gain</a>), <a class="code" href="classgri__agc2__ff.html#adb71295d2928af0d4b5df992226bba25">_max_gain</a>(<a class="code" href="classgri__agc2__ff.html#a620cdd0ff301b21812e5a900261add68">max_gain</a>) {};
<a name="l00041"></a>00041
<a name="l00042"></a><a class="code" href="classgri__agc2__ff.html#ab71f2b30849017047dd8a5195b545139">00042</a> <span class="keywordtype">float</span> <a class="code" href="classgri__agc2__ff.html#ab71f2b30849017047dd8a5195b545139">attack_rate</a> ()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> <a class="code" href="classgri__agc2__ff.html#a5392044533465105cd05b1913062e257">_attack_rate</a>; }
<a name="l00043"></a><a class="code" href="classgri__agc2__ff.html#aef4665005d82da2e0d0251637b641256">00043</a> <span class="keywordtype">float</span> <a class="code" href="classgri__agc2__ff.html#aef4665005d82da2e0d0251637b641256">decay_rate</a> ()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> <a class="code" href="classgri__agc2__ff.html#a087b22a47a1c8fc809ce078539ddc381">_decay_rate</a>; }
<a name="l00044"></a><a class="code" href="classgri__agc2__ff.html#a48ef18e97cd468fbb7ddd2d0d03cf239">00044</a> <span class="keywordtype">float</span> <a class="code" href="classgri__agc2__ff.html#a48ef18e97cd468fbb7ddd2d0d03cf239">reference</a> ()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> <a class="code" href="classgri__agc2__ff.html#a7c9d778b2295af6dd1876b15d1a4d3ad">_reference</a>; }
<a name="l00045"></a><a class="code" href="classgri__agc2__ff.html#ab1655af168460935adf7187c33a52443">00045</a> <span class="keywordtype">float</span> <a class="code" href="classgri__agc2__ff.html#ab1655af168460935adf7187c33a52443">gain</a> ()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> <a class="code" href="classgri__agc2__ff.html#ade496b0213db856bccba66a0ae5a6055">_gain</a>; }
<a name="l00046"></a><a class="code" href="classgri__agc2__ff.html#a620cdd0ff301b21812e5a900261add68">00046</a> <span class="keywordtype">float</span> <a class="code" href="classgri__agc2__ff.html#a620cdd0ff301b21812e5a900261add68">max_gain</a> ()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> <a class="code" href="classgri__agc2__ff.html#adb71295d2928af0d4b5df992226bba25">_max_gain</a>; }
<a name="l00047"></a>00047
<a name="l00048"></a><a class="code" href="classgri__agc2__ff.html#aad13e310ce06c5db26d0dbe7f951fc74">00048</a> <span class="keywordtype">void</span> <a class="code" href="classgri__agc2__ff.html#aad13e310ce06c5db26d0dbe7f951fc74">set_attack_rate</a> (<span class="keywordtype">float</span> rate) { <a class="code" href="classgri__agc2__ff.html#a5392044533465105cd05b1913062e257">_attack_rate</a> = rate; }
<a name="l00049"></a><a class="code" href="classgri__agc2__ff.html#aef0943b2a196f42af423ce59548e9c15">00049</a> <span class="keywordtype">void</span> <a class="code" href="classgri__agc2__ff.html#aef0943b2a196f42af423ce59548e9c15">set_decay_rate</a> (<span class="keywordtype">float</span> rate) { <a class="code" href="classgri__agc2__ff.html#a087b22a47a1c8fc809ce078539ddc381">_decay_rate</a> = rate; }
<a name="l00050"></a><a class="code" href="classgri__agc2__ff.html#a223cd9f846e53d1c75fa69270e6bcecd">00050</a> <span class="keywordtype">void</span> <a class="code" href="classgri__agc2__ff.html#a223cd9f846e53d1c75fa69270e6bcecd">set_reference</a> (<span class="keywordtype">float</span> <a class="code" href="classgri__agc2__ff.html#a48ef18e97cd468fbb7ddd2d0d03cf239">reference</a>) { <a class="code" href="classgri__agc2__ff.html#a7c9d778b2295af6dd1876b15d1a4d3ad">_reference</a> = <a class="code" href="classgri__agc2__ff.html#a48ef18e97cd468fbb7ddd2d0d03cf239">reference</a>; }
<a name="l00051"></a><a class="code" href="classgri__agc2__ff.html#a93c67b340f54b07a01dee02707cff441">00051</a> <span class="keywordtype">void</span> <a class="code" href="classgri__agc2__ff.html#a93c67b340f54b07a01dee02707cff441">set_gain</a> (<span class="keywordtype">float</span> <a class="code" href="classgri__agc2__ff.html#ab1655af168460935adf7187c33a52443">gain</a>) { <a class="code" href="classgri__agc2__ff.html#ade496b0213db856bccba66a0ae5a6055">_gain</a> = <a class="code" href="classgri__agc2__ff.html#ab1655af168460935adf7187c33a52443">gain</a>; }
<a name="l00052"></a><a class="code" href="classgri__agc2__ff.html#a1ad9d043e33641444bc55d9da1452d31">00052</a> <span class="keywordtype">void</span> <a class="code" href="classgri__agc2__ff.html#a1ad9d043e33641444bc55d9da1452d31">set_max_gain</a> (<span class="keywordtype">float</span> <a class="code" href="classgri__agc2__ff.html#a620cdd0ff301b21812e5a900261add68">max_gain</a>) { <a class="code" href="classgri__agc2__ff.html#adb71295d2928af0d4b5df992226bba25">_max_gain</a> = <a class="code" href="classgri__agc2__ff.html#a620cdd0ff301b21812e5a900261add68">max_gain</a>; }
<a name="l00053"></a>00053
<a name="l00054"></a><a class="code" href="classgri__agc2__ff.html#ad040762fe6c79ebff1b3f3e170ba6ebf">00054</a> <span class="keywordtype">float</span> <a class="code" href="classgri__agc2__ff.html#ad040762fe6c79ebff1b3f3e170ba6ebf">scale</a> (<span class="keywordtype">float</span> input){
<a name="l00055"></a>00055 <span class="keywordtype">float</span> output = input * <a class="code" href="classgri__agc2__ff.html#ade496b0213db856bccba66a0ae5a6055">_gain</a>;
<a name="l00056"></a>00056
<a name="l00057"></a>00057 <span class="keywordtype">float</span> tmp = (fabsf(output)) - <a class="code" href="classgri__agc2__ff.html#a7c9d778b2295af6dd1876b15d1a4d3ad">_reference</a>;
<a name="l00058"></a>00058 <span class="keywordtype">float</span> rate = <a class="code" href="classgri__agc2__ff.html#a087b22a47a1c8fc809ce078539ddc381">_decay_rate</a>;
<a name="l00059"></a>00059 <span class="keywordflow">if</span>(fabsf(tmp) > <a class="code" href="classgri__agc2__ff.html#ade496b0213db856bccba66a0ae5a6055">_gain</a>)
<a name="l00060"></a>00060 rate = <a class="code" href="classgri__agc2__ff.html#a5392044533465105cd05b1913062e257">_attack_rate</a>;
<a name="l00061"></a>00061 _gain -= tmp*rate;
<a name="l00062"></a>00062
<a name="l00063"></a>00063 <span class="preprocessor">#if 0</span>
<a name="l00064"></a>00064 <span class="preprocessor"></span> fprintf(stdout, <span class="stringliteral">"rate = %f\ttmp = %f\t gain = %f\n"</span>, rate, tmp, _gain);
<a name="l00065"></a>00065 <span class="preprocessor">#endif</span>
<a name="l00066"></a>00066 <span class="preprocessor"></span>
<a name="l00067"></a>00067 <span class="comment">// Not sure about this</span>
<a name="l00068"></a>00068 <span class="keywordflow">if</span> (_gain < 0.0)
<a name="l00069"></a>00069 _gain = 10e-5;
<a name="l00070"></a>00070
<a name="l00071"></a>00071 <span class="keywordflow">if</span> (<a class="code" href="classgri__agc2__ff.html#adb71295d2928af0d4b5df992226bba25">_max_gain</a> > 0.0 && _gain > <a class="code" href="classgri__agc2__ff.html#adb71295d2928af0d4b5df992226bba25">_max_gain</a>)
<a name="l00072"></a>00072 _gain = <a class="code" href="classgri__agc2__ff.html#adb71295d2928af0d4b5df992226bba25">_max_gain</a>;
<a name="l00073"></a>00073 <span class="keywordflow">return</span> output;
<a name="l00074"></a>00074 }
<a name="l00075"></a>00075
<a name="l00076"></a><a class="code" href="classgri__agc2__ff.html#a6d95e84dd2da28195aa90094f38d1a1b">00076</a> <span class="keywordtype">void</span> <a class="code" href="classgri__agc2__ff.html#a6d95e84dd2da28195aa90094f38d1a1b">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="l00077"></a>00077 <span class="keywordflow">for</span> (<span class="keywordtype">unsigned</span> i = 0; i < n; i++)
<a name="l00078"></a>00078 output[i] = <a class="code" href="classgri__agc2__ff.html#ad040762fe6c79ebff1b3f3e170ba6ebf">scale</a> (input[i]);
<a name="l00079"></a>00079 }
<a name="l00080"></a>00080
<a name="l00081"></a>00081 <span class="keyword">protected</span>:
<a name="l00082"></a><a class="code" href="classgri__agc2__ff.html#a5392044533465105cd05b1913062e257">00082</a> <span class="keywordtype">float</span> <a class="code" href="classgri__agc2__ff.html#a5392044533465105cd05b1913062e257">_attack_rate</a>; <span class="comment">// attack_rate for fast changing signals</span>
<a name="l00083"></a><a class="code" href="classgri__agc2__ff.html#a087b22a47a1c8fc809ce078539ddc381">00083</a> <span class="keywordtype">float</span> <a class="code" href="classgri__agc2__ff.html#a087b22a47a1c8fc809ce078539ddc381">_decay_rate</a>; <span class="comment">// decay rate for slow changing signals</span>
<a name="l00084"></a><a class="code" href="classgri__agc2__ff.html#a7c9d778b2295af6dd1876b15d1a4d3ad">00084</a> <span class="keywordtype">float</span> <a class="code" href="classgri__agc2__ff.html#a7c9d778b2295af6dd1876b15d1a4d3ad">_reference</a>; <span class="comment">// reference value</span>
<a name="l00085"></a><a class="code" href="classgri__agc2__ff.html#ade496b0213db856bccba66a0ae5a6055">00085</a> <span class="keywordtype">float</span> <a class="code" href="classgri__agc2__ff.html#ade496b0213db856bccba66a0ae5a6055">_gain</a>; <span class="comment">// current gain</span>
<a name="l00086"></a><a class="code" href="classgri__agc2__ff.html#adb71295d2928af0d4b5df992226bba25">00086</a> <span class="keywordtype">float</span> <a class="code" href="classgri__agc2__ff.html#adb71295d2928af0d4b5df992226bba25">_max_gain</a>; <span class="comment">// maximum gain</span>
<a name="l00087"></a>00087 };
<a name="l00088"></a>00088
<a name="l00089"></a>00089 <span class="preprocessor">#endif </span><span class="comment">/* _GRI_AGC2_FF_H_ */</span>
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