<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/xhtml;charset=UTF-8"/> <title>GNU Radio 3.2.2 C++ API: gr_sync_decimator.h Source File</title> <link href="tabs.css" rel="stylesheet" type="text/css"/> <link href="navtree.css" rel="stylesheet" type="text/css"/> <script type="text/javascript" src="jquery.js"></script> <script type="text/javascript" src="navtree.js"></script> <script type="text/javascript" src="resize.js"></script> <script type="text/javascript"> $(document).ready(initResizable); </script> <link href="doxygen.css" rel="stylesheet" type="text/css"/> </head> <body> <!-- Generated by Doxygen 1.7.3 --> <div id="top"> <div id="titlearea"> <table cellspacing="0" cellpadding="0"> <tbody> <tr style="height: 56px;"> <td style="padding-left: 0.5em;"> <div id="projectname">GNU Radio 3.2.2 C++ API</div> </td> </tr> </tbody> </table> </div> </div> <div id="side-nav" class="ui-resizable side-nav-resizable"> <div id="nav-tree"> <div id="nav-tree-contents"> </div> </div> <div id="splitbar" style="-moz-user-select:none;" class="ui-resizable-handle"> </div> </div> <script type="text/javascript"> initNavTree('gr__sync__decimator_8h.html',''); </script> <div id="doc-content"> <div class="header"> <div class="headertitle"> <h1>gr_sync_decimator.h</h1> </div> </div> <div class="contents"> <a href="gr__sync__decimator_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 2004 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_GR_SYNC_DECIMATOR_H</span> <a name="l00024"></a>00024 <span class="preprocessor"></span><span class="preprocessor">#define INCLUDED_GR_SYNC_DECIMATOR_H</span> <a name="l00025"></a>00025 <span class="preprocessor"></span> <a name="l00026"></a>00026 <span class="preprocessor">#include <<a class="code" href="gr__sync__block_8h.html">gr_sync_block.h</a>></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 synchronous N:1 input to output with history</span> <a name="l00030"></a>00030 <span class="comment"> * \ingroup base_blk</span> <a name="l00031"></a>00031 <span class="comment"> *</span> <a name="l00032"></a>00032 <span class="comment"> * Override work to provide the signal processing implementation.</span> <a name="l00033"></a>00033 <span class="comment"> */</span> <a name="l00034"></a><a class="code" href="classgr__sync__decimator.html">00034</a> <span class="keyword">class </span><a class="code" href="classgr__sync__decimator.html" title="synchronous N:1 input to output with historyOverride work to provide the signal processing implementa...">gr_sync_decimator</a> : <span class="keyword">public</span> <a class="code" href="classgr__sync__block.html" title="synchronous 1:1 input to output with historyOverride work to provide the signal processing implementa...">gr_sync_block</a> <a name="l00035"></a>00035 { <a name="l00036"></a>00036 <span class="keyword">private</span>: <a name="l00037"></a>00037 <span class="keywordtype">unsigned</span> d_decimation; <a name="l00038"></a>00038 <a name="l00039"></a>00039 <span class="keyword">protected</span>: <a name="l00040"></a>00040 <a name="l00041"></a>00041 <a class="code" href="classgr__sync__decimator.html#ad3871148480f33b75202744974d9241c">gr_sync_decimator</a> (<span class="keyword">const</span> std::string &<a class="code" href="classgr__basic__block.html#aa12a20d8b8eab341da935530d29299d2">name</a>, <a name="l00042"></a>00042 <a class="code" href="classboost_1_1shared__ptr.html">gr_io_signature_sptr</a> <a class="code" href="classgr__basic__block.html#a58f6d05e85931200f3771d3e50741281">input_signature</a>, <a name="l00043"></a>00043 <a class="code" href="classboost_1_1shared__ptr.html">gr_io_signature_sptr</a> <a class="code" href="classgr__basic__block.html#add68b96f012dfe352700b4fd1c3a184a">output_signature</a>, <a name="l00044"></a>00044 <span class="keywordtype">unsigned</span> <a class="code" href="classgr__sync__decimator.html#a285a3292be71f47df2e8f10a779eb752">decimation</a>); <a name="l00045"></a>00045 <span class="keyword">public</span>: <a name="l00046"></a>00046 <a name="l00047"></a><a class="code" href="classgr__sync__decimator.html#a285a3292be71f47df2e8f10a779eb752">00047</a> <span class="keywordtype">unsigned</span> <a class="code" href="classgr__sync__decimator.html#a285a3292be71f47df2e8f10a779eb752">decimation</a> ()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> d_decimation; } <a name="l00048"></a><a class="code" href="classgr__sync__decimator.html#a5ae57c3e625dfaca6487a319c2078a57">00048</a> <span class="keywordtype">void</span> <a class="code" href="classgr__sync__decimator.html#a5ae57c3e625dfaca6487a319c2078a57">set_decimation</a> (<span class="keywordtype">unsigned</span> decimation) <a name="l00049"></a>00049 { <a name="l00050"></a>00050 d_decimation = <a class="code" href="classgr__sync__decimator.html#a285a3292be71f47df2e8f10a779eb752">decimation</a>; <a name="l00051"></a>00051 <a class="code" href="classgr__block.html#ab9dc7e6d30692bbfa65fc7c4eef6fc9d" title="Set the approximate output rate / input rate.">set_relative_rate</a> (1.0 / decimation); <a name="l00052"></a>00052 } <a name="l00053"></a>00053 <a name="l00054"></a>00054 <span class="comment">// gr_sync_decimator overrides these to assist work</span> <a name="l00055"></a>00055 <span class="keywordtype">void</span> <a class="code" href="classgr__sync__decimator.html#a140792c0a9777b6b82eb220cdd424ecd" title="Estimate input requirements given output request.">forecast</a> (<span class="keywordtype">int</span> noutput_items, <a class="code" href="classstd_1_1vector.html">gr_vector_int</a> &ninput_items_required); <a name="l00056"></a>00056 <span class="keywordtype">int</span> <a class="code" href="classgr__sync__decimator.html#a3a7d9a6487780922c14cbb76d46a0586" title="compute output items from input items">general_work</a> (<span class="keywordtype">int</span> noutput_items, <a name="l00057"></a>00057 <a class="code" href="classstd_1_1vector.html">gr_vector_int</a> &ninput_items, <a name="l00058"></a>00058 <a class="code" href="classstd_1_1vector.html">gr_vector_const_void_star</a> &input_items, <a name="l00059"></a>00059 <a class="code" href="classstd_1_1vector.html">gr_vector_void_star</a> &output_items); <a name="l00060"></a>00060 <a name="l00061"></a>00061 <span class="comment">// derived classes should override work</span> <a name="l00062"></a>00062 <a name="l00063"></a>00063 <span class="keywordtype">int</span> <a class="code" href="classgr__sync__decimator.html#a23c657d3c3f0482369648e1916751f6f" title="Given ninput samples, return number of output samples that will be produced. N.B. this is only define...">fixed_rate_ninput_to_noutput</a>(<span class="keywordtype">int</span> ninput); <a name="l00064"></a>00064 <span class="keywordtype">int</span> <a class="code" href="classgr__sync__decimator.html#a90041d67e72c64cb4d0f9a29bfbbd776" title="Given noutput samples, return number of input samples required to produce noutput. N.B. this is only defined if fixed_rate returns true. Generally speaking, you don&#39;t need to override this.">fixed_rate_noutput_to_ninput</a>(<span class="keywordtype">int</span> noutput); <a name="l00065"></a>00065 }; <a name="l00066"></a>00066 <a name="l00067"></a>00067 <a name="l00068"></a>00068 <span class="preprocessor">#endif </span><span class="comment">/* INCLUDED_GR_SYNC_DECIMATOR_H */</span> </pre></div></div> </div> <div id="nav-path" class="navpath"> <ul> <li class="navelem"><a class="el" href="gr__sync__decimator_8h.html">gr_sync_decimator.h</a> </li> <li class="footer">Generated on Thu Feb 17 2011 for GNU Radio 3.2.2 C++ API by  <a href="http://www.doxygen.org/index.html"> <img class="footer" src="doxygen.png" alt="doxygen"/></a> 1.7.3 </li> </ul> </div> </body> </html>