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<h1>gri_mmse_fir_interpolator.h</h1> </div>
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<a href="gri__mmse__fir__interpolator_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 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 _GRI_MMSE_FIR_INTERPOLATOR_H_</span>
<a name="l00023"></a>00023 <span class="preprocessor"></span><span class="preprocessor">#define _GRI_MMSE_FIR_INTERPOLATOR_H_</span>
<a name="l00024"></a>00024 <span class="preprocessor"></span>
<a name="l00025"></a>00025 <span class="preprocessor">#include <vector></span>
<a name="l00026"></a>00026
<a name="l00027"></a>00027 <span class="keyword">class </span><a class="code" href="classgr__fir__fff.html" title="Abstract class for FIR with float input, float output and float tapsThis is the abstract class for a ...">gr_fir_fff</a>;
<a name="l00028"></a>00028 <span class="comment"></span>
<a name="l00029"></a>00029 <span class="comment">/*!</span>
<a name="l00030"></a>00030 <span class="comment"> * \brief Compute intermediate samples between signal samples x(k*Ts)</span>
<a name="l00031"></a>00031 <span class="comment"> * \ingroup filter_primitive</span>
<a name="l00032"></a>00032 <span class="comment"> *</span>
<a name="l00033"></a>00033 <span class="comment"> * This implements a Mininum Mean Squared Error interpolator with 8 taps.</span>
<a name="l00034"></a>00034 <span class="comment"> * It is suitable for signals where the bandwidth of interest B = 1/(4*Ts)</span>
<a name="l00035"></a>00035 <span class="comment"> * Where Ts is the time between samples.</span>
<a name="l00036"></a>00036 <span class="comment"> *</span>
<a name="l00037"></a>00037 <span class="comment"> * Although mu, the fractional delay, is specified as a float, it is actually</span>
<a name="l00038"></a>00038 <span class="comment"> * quantized. 0.0 <= mu <= 1.0. That is, mu is quantized in the interpolate </span>
<a name="l00039"></a>00039 <span class="comment"> * method to 32nd's of a sample.</span>
<a name="l00040"></a>00040 <span class="comment"> */</span>
<a name="l00041"></a>00041
<a name="l00042"></a><a class="code" href="classgri__mmse__fir__interpolator.html">00042</a> <span class="keyword">class </span><a class="code" href="classgri__mmse__fir__interpolator.html" title="Compute intermediate samples between signal samples x(k*Ts)This implements a Mininum Mean Squared Err...">gri_mmse_fir_interpolator</a> {
<a name="l00043"></a>00043 <span class="keyword">public</span>:
<a name="l00044"></a>00044 <a class="code" href="classgri__mmse__fir__interpolator.html#acef2c87da6ff7b17b4001f472cfd422a">gri_mmse_fir_interpolator</a> ();
<a name="l00045"></a>00045 <a class="code" href="classgri__mmse__fir__interpolator.html#a7cb748baab11bb51d602513a2ab1be0c">~gri_mmse_fir_interpolator</a> ();
<a name="l00046"></a>00046
<a name="l00047"></a>00047 <span class="keywordtype">unsigned</span> <a class="code" href="classgri__mmse__fir__interpolator.html#a66ea50db8f30b2f692cd4af84cb41514">ntaps</a> () <span class="keyword">const</span>;
<a name="l00048"></a>00048 <span class="keywordtype">unsigned</span> <a class="code" href="classgri__mmse__fir__interpolator.html#aed701038ff73feb2961bbe80ed1b1e99">nsteps</a> () <span class="keyword">const</span>;
<a name="l00049"></a>00049 <span class="comment"></span>
<a name="l00050"></a>00050 <span class="comment"> /*!</span>
<a name="l00051"></a>00051 <span class="comment"> * \brief compute a single interpolated output value.</span>
<a name="l00052"></a>00052 <span class="comment"> * \p input must have ntaps() valid entries.</span>
<a name="l00053"></a>00053 <span class="comment"> * input[0] .. input[ntaps() - 1] are referenced to compute the output value.</span>
<a name="l00054"></a>00054 <span class="comment"> *</span>
<a name="l00055"></a>00055 <span class="comment"> * \p mu must be in the range [0, 1] and specifies the fractional delay.</span>
<a name="l00056"></a>00056 <span class="comment"> *</span>
<a name="l00057"></a>00057 <span class="comment"> * \returns the interpolated input value.</span>
<a name="l00058"></a>00058 <span class="comment"> */</span>
<a name="l00059"></a>00059 <span class="keywordtype">float</span> <a class="code" href="classgri__mmse__fir__interpolator.html#a9674dd09e73769c41a893152e85adab4" title="compute a single interpolated output value. input must have ntaps() valid entries. input[0] .. input[ntaps() - 1] are referenced to compute the output value.">interpolate</a> (<span class="keyword">const</span> <span class="keywordtype">float</span> input[], <span class="keywordtype">float</span> mu) <span class="keyword">const</span>;
<a name="l00060"></a>00060
<a name="l00061"></a>00061 <span class="keyword">protected</span>:
<a name="l00062"></a><a class="code" href="classgri__mmse__fir__interpolator.html#a032cd8df0c724463c192da99a85b29d7">00062</a> <a class="code" href="classstd_1_1vector.html">std::vector<gr_fir_fff *></a> <a class="code" href="classgri__mmse__fir__interpolator.html#a032cd8df0c724463c192da99a85b29d7">filters</a>;
<a name="l00063"></a>00063 };
<a name="l00064"></a>00064
<a name="l00065"></a>00065
<a name="l00066"></a>00066 <span class="preprocessor">#endif </span><span class="comment">/* _GRI_MMSE_FIR_INTERPOLATOR_H_ */</span>
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