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<h1>gr_single_pole_iir.h</h1> </div>
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<a href="gr__single__pole__iir_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 <span class="preprocessor">#ifndef _GR_SINGLE_POLE_IIR_H_</span>
<a name="l00023"></a>00023 <span class="preprocessor"></span><span class="preprocessor">#define _GR_SINGLE_POLE_IIR_H_</span>
<a name="l00024"></a>00024 <span class="preprocessor"></span>
<a name="l00025"></a>00025 <span class="preprocessor">#include <stdexcept></span>
<a name="l00026"></a>00026 <span class="preprocessor">#include <gr_complex.h></span><span class="comment"></span>
<a name="l00027"></a>00027 <span class="comment">/*!</span>
<a name="l00028"></a>00028 <span class="comment"> * \brief class template for single pole IIR filter</span>
<a name="l00029"></a>00029 <span class="comment"> */</span>
<a name="l00030"></a>00030 <span class="keyword">template</span><<span class="keyword">class</span> o_type, <span class="keyword">class</span> i_type, <span class="keyword">class</span> tap_type>
<a name="l00031"></a><a class="code" href="classgr__single__pole__iir.html">00031</a> <span class="keyword">class </span><a class="code" href="classgr__single__pole__iir.html" title="class template for single pole IIR filter">gr_single_pole_iir</a> {
<a name="l00032"></a>00032 <span class="keyword">public</span>:<span class="comment"></span>
<a name="l00033"></a>00033 <span class="comment"> /*!</span>
<a name="l00034"></a>00034 <span class="comment"> * \brief construct new single pole IIR with given alpha</span>
<a name="l00035"></a>00035 <span class="comment"> *</span>
<a name="l00036"></a>00036 <span class="comment"> * computes y(i) = (1-alpha) * y(i-1) + alpha * x(i)</span>
<a name="l00037"></a>00037 <span class="comment"> */</span>
<a name="l00038"></a><a class="code" href="classgr__single__pole__iir.html#a0bd31e559ccc5cce039f198ec9b88e93">00038</a> <a class="code" href="classgr__single__pole__iir.html#a0bd31e559ccc5cce039f198ec9b88e93" title="construct new single pole IIR with given alpha">gr_single_pole_iir</a> (tap_type alpha = 1.0)
<a name="l00039"></a>00039 {
<a name="l00040"></a>00040 <a class="code" href="classgr__single__pole__iir.html#a896007d3ed8be78894c19a6f58fd870f">d_prev_output</a> = 0;
<a name="l00041"></a>00041 <a class="code" href="classgr__single__pole__iir.html#af8f1dfca2e1492caf5ef10a6d01f7851" title="install alpha as the current taps.">set_taps</a> (alpha);
<a name="l00042"></a>00042 }
<a name="l00043"></a>00043 <span class="comment"></span>
<a name="l00044"></a>00044 <span class="comment"> /*!</span>
<a name="l00045"></a>00045 <span class="comment"> * \brief compute a single output value.</span>
<a name="l00046"></a>00046 <span class="comment"> * \returns the filtered input value.</span>
<a name="l00047"></a>00047 <span class="comment"> */</span>
<a name="l00048"></a>00048 o_type <a class="code" href="classgr__single__pole__iir.html#ad8cecedbfed0bc1f24524d08914288c7" title="compute a single output value.">filter</a> (<span class="keyword">const</span> i_type input);
<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 an array of N output values.</span>
<a name="l00052"></a>00052 <span class="comment"> * \p input must have n valid entries.</span>
<a name="l00053"></a>00053 <span class="comment"> */</span>
<a name="l00054"></a>00054 <span class="keywordtype">void</span> <a class="code" href="classgr__single__pole__iir.html#aabd52c15f1973d6e75d8aad3a2c6381c" title="compute an array of N output values. input must have n valid entries.">filterN</a> (o_type output[], <span class="keyword">const</span> i_type input[], <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> n);
<a name="l00055"></a>00055 <span class="comment"></span>
<a name="l00056"></a>00056 <span class="comment"> /*!</span>
<a name="l00057"></a>00057 <span class="comment"> * \brief install \p alpha as the current taps.</span>
<a name="l00058"></a>00058 <span class="comment"> */</span>
<a name="l00059"></a><a class="code" href="classgr__single__pole__iir.html#af8f1dfca2e1492caf5ef10a6d01f7851">00059</a> <span class="keywordtype">void</span> <a class="code" href="classgr__single__pole__iir.html#af8f1dfca2e1492caf5ef10a6d01f7851" title="install alpha as the current taps.">set_taps</a> (tap_type alpha)
<a name="l00060"></a>00060 {
<a name="l00061"></a>00061 <span class="keywordflow">if</span> (alpha < 0 || alpha > 1)
<a name="l00062"></a>00062 <span class="keywordflow">throw</span> std::out_of_range (<span class="stringliteral">"Alpha must be in [0, 1]\n"</span>);
<a name="l00063"></a>00063
<a name="l00064"></a>00064 <a class="code" href="classgr__single__pole__iir.html#a3cecd484003a907e60ff8d0eff8fa887">d_alpha</a> = alpha;
<a name="l00065"></a>00065 <a class="code" href="classgr__single__pole__iir.html#a5e0f640e76cd29ba756d962097ede891">d_one_minus_alpha</a> = 1.0 - alpha;
<a name="l00066"></a>00066 }
<a name="l00067"></a>00067 <span class="comment"></span>
<a name="l00068"></a>00068 <span class="comment"> //! reset state to zero</span>
<a name="l00069"></a><a class="code" href="classgr__single__pole__iir.html#aec64a97520727ae05377c782b44b6062">00069</a> <span class="comment"></span> <span class="keywordtype">void</span> <a class="code" href="classgr__single__pole__iir.html#aec64a97520727ae05377c782b44b6062" title="reset state to zero">reset</a> ()
<a name="l00070"></a>00070 {
<a name="l00071"></a>00071 <a class="code" href="classgr__single__pole__iir.html#a896007d3ed8be78894c19a6f58fd870f">d_prev_output</a> = 0;
<a name="l00072"></a>00072 }
<a name="l00073"></a>00073
<a name="l00074"></a><a class="code" href="classgr__single__pole__iir.html#a3cb0c20fea52b8168e5c0a57476dfb87">00074</a> tap_type <a class="code" href="classgr__single__pole__iir.html#a3cb0c20fea52b8168e5c0a57476dfb87">prev_output</a> () { <span class="keywordflow">return</span> <a class="code" href="classgr__single__pole__iir.html#a896007d3ed8be78894c19a6f58fd870f">d_prev_output</a>; }
<a name="l00075"></a>00075
<a name="l00076"></a>00076 <span class="keyword">protected</span>:
<a name="l00077"></a><a class="code" href="classgr__single__pole__iir.html#a3cecd484003a907e60ff8d0eff8fa887">00077</a> tap_type <a class="code" href="classgr__single__pole__iir.html#a3cecd484003a907e60ff8d0eff8fa887">d_alpha</a>;
<a name="l00078"></a><a class="code" href="classgr__single__pole__iir.html#a5e0f640e76cd29ba756d962097ede891">00078</a> tap_type <a class="code" href="classgr__single__pole__iir.html#a5e0f640e76cd29ba756d962097ede891">d_one_minus_alpha</a>;
<a name="l00079"></a><a class="code" href="classgr__single__pole__iir.html#a896007d3ed8be78894c19a6f58fd870f">00079</a> tap_type <a class="code" href="classgr__single__pole__iir.html#a896007d3ed8be78894c19a6f58fd870f">d_prev_output</a>;
<a name="l00080"></a>00080 };
<a name="l00081"></a>00081
<a name="l00082"></a>00082
<a name="l00083"></a>00083 <span class="comment">//</span>
<a name="l00084"></a>00084 <span class="comment">// general case. We may want to specialize this</span>
<a name="l00085"></a>00085 <span class="comment">//</span>
<a name="l00086"></a>00086 <span class="keyword">template</span><<span class="keyword">class</span> o_type, <span class="keyword">class</span> i_type, <span class="keyword">class</span> tap_type>
<a name="l00087"></a>00087 o_type
<a name="l00088"></a><a class="code" href="classgr__single__pole__iir.html#ad8cecedbfed0bc1f24524d08914288c7">00088</a> <a class="code" href="classgr__single__pole__iir.html#ad8cecedbfed0bc1f24524d08914288c7" title="compute a single output value.">gr_single_pole_iir<o_type, i_type, tap_type>::filter</a> (<span class="keyword">const</span> i_type input)
<a name="l00089"></a>00089 {
<a name="l00090"></a>00090 tap_type output;
<a name="l00091"></a>00091
<a name="l00092"></a>00092 output = d_alpha * input + d_one_minus_alpha * d_prev_output;
<a name="l00093"></a>00093 d_prev_output = output;
<a name="l00094"></a>00094
<a name="l00095"></a>00095 <span class="keywordflow">return</span> (o_type) output;
<a name="l00096"></a>00096 }
<a name="l00097"></a>00097
<a name="l00098"></a>00098
<a name="l00099"></a>00099 <span class="keyword">template</span><<span class="keyword">class</span> o_type, <span class="keyword">class</span> i_type, <span class="keyword">class</span> tap_type>
<a name="l00100"></a>00100 <span class="keywordtype">void</span>
<a name="l00101"></a><a class="code" href="classgr__single__pole__iir.html#aabd52c15f1973d6e75d8aad3a2c6381c">00101</a> <a class="code" href="classgr__single__pole__iir.html#aabd52c15f1973d6e75d8aad3a2c6381c" title="compute an array of N output values. input must have n valid entries.">gr_single_pole_iir<o_type, i_type, tap_type>::filterN</a> (o_type output[],
<a name="l00102"></a>00102 <span class="keyword">const</span> i_type input[],
<a name="l00103"></a>00103 <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> n)
<a name="l00104"></a>00104 {
<a name="l00105"></a>00105 <span class="keywordflow">for</span> (<span class="keywordtype">unsigned</span> i = 0; i < n; i++)
<a name="l00106"></a>00106 output[i] = filter (input[i]);
<a name="l00107"></a>00107 }
<a name="l00108"></a>00108
<a name="l00109"></a>00109
<a name="l00110"></a>00110 <span class="comment">//</span>
<a name="l00111"></a>00111 <span class="comment">// Specialized case for gr_complex output and double taps</span>
<a name="l00112"></a>00112 <span class="comment">// We need to have a gr_complexd type for the calculations and prev_output variable (in stead of double)</span>
<a name="l00113"></a>00113
<a name="l00114"></a>00114 <span class="keyword">template</span><<span class="keyword">class</span> i_type>
<a name="l00115"></a><a class="code" href="classgr__single__pole__iir_3_01gr__complex_00_01i__type_00_01double_01_4.html">00115</a> <span class="keyword">class </span><a class="code" href="classgr__single__pole__iir.html" title="class template for single pole IIR filter">gr_single_pole_iir</a><<a class="code" href="gr__complex_8h.html#aec4bfe41433369afae9327f1b0bc9109">gr_complex</a>, i_type, double> {
<a name="l00116"></a>00116 <span class="keyword">public</span>:<span class="comment"></span>
<a name="l00117"></a>00117 <span class="comment"> /*!</span>
<a name="l00118"></a>00118 <span class="comment"> * \brief construct new single pole IIR with given alpha</span>
<a name="l00119"></a>00119 <span class="comment"> *</span>
<a name="l00120"></a>00120 <span class="comment"> * computes y(i) = (1-alpha) * y(i-1) + alpha * x(i)</span>
<a name="l00121"></a>00121 <span class="comment"> */</span>
<a name="l00122"></a><a class="code" href="classgr__single__pole__iir_3_01gr__complex_00_01i__type_00_01double_01_4.html#a60f697c8924bd2d2ca6a370d606d2483">00122</a> <a class="code" href="classgr__single__pole__iir.html#a0bd31e559ccc5cce039f198ec9b88e93" title="construct new single pole IIR with given alpha">gr_single_pole_iir</a> (<span class="keywordtype">double</span> alpha = 1.0)
<a name="l00123"></a>00123 {
<a name="l00124"></a>00124 <a class="code" href="classgr__single__pole__iir.html#a896007d3ed8be78894c19a6f58fd870f">d_prev_output</a> = 0;
<a name="l00125"></a>00125 <a class="code" href="classgr__single__pole__iir.html#af8f1dfca2e1492caf5ef10a6d01f7851" title="install alpha as the current taps.">set_taps</a> (alpha);
<a name="l00126"></a>00126 }
<a name="l00127"></a>00127 <span class="comment"></span>
<a name="l00128"></a>00128 <span class="comment"> /*!</span>
<a name="l00129"></a>00129 <span class="comment"> * \brief compute a single output value.</span>
<a name="l00130"></a>00130 <span class="comment"> * \returns the filtered input value.</span>
<a name="l00131"></a>00131 <span class="comment"> */</span>
<a name="l00132"></a>00132 <a class="code" href="gr__complex_8h.html#aec4bfe41433369afae9327f1b0bc9109">gr_complex</a> <a class="code" href="classgr__single__pole__iir.html#ad8cecedbfed0bc1f24524d08914288c7" title="compute a single output value.">filter</a> (<span class="keyword">const</span> i_type input);
<a name="l00133"></a>00133 <span class="comment"></span>
<a name="l00134"></a>00134 <span class="comment"> /*!</span>
<a name="l00135"></a>00135 <span class="comment"> * \brief compute an array of N output values.</span>
<a name="l00136"></a>00136 <span class="comment"> * \p input must have n valid entries.</span>
<a name="l00137"></a>00137 <span class="comment"> */</span>
<a name="l00138"></a>00138 <span class="keywordtype">void</span> <a class="code" href="classgr__single__pole__iir.html#aabd52c15f1973d6e75d8aad3a2c6381c" title="compute an array of N output values. input must have n valid entries.">filterN</a> (<a class="code" href="gr__complex_8h.html#aec4bfe41433369afae9327f1b0bc9109">gr_complex</a> output[], <span class="keyword">const</span> i_type input[], <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> n);
<a name="l00139"></a>00139 <span class="comment"></span>
<a name="l00140"></a>00140 <span class="comment"> /*!</span>
<a name="l00141"></a>00141 <span class="comment"> * \brief install \p alpha as the current taps.</span>
<a name="l00142"></a>00142 <span class="comment"> */</span>
<a name="l00143"></a><a class="code" href="classgr__single__pole__iir_3_01gr__complex_00_01i__type_00_01double_01_4.html#aa97e7a76ddbefd08b3a32d674891ce8a">00143</a> <span class="keywordtype">void</span> <a class="code" href="classgr__single__pole__iir.html#af8f1dfca2e1492caf5ef10a6d01f7851" title="install alpha as the current taps.">set_taps</a> (<span class="keywordtype">double</span> alpha)
<a name="l00144"></a>00144 {
<a name="l00145"></a>00145 <span class="keywordflow">if</span> (alpha < 0 || alpha > 1)
<a name="l00146"></a>00146 <span class="keywordflow">throw</span> std::out_of_range (<span class="stringliteral">"Alpha must be in [0, 1]\n"</span>);
<a name="l00147"></a>00147
<a name="l00148"></a>00148 <a class="code" href="classgr__single__pole__iir.html#a3cecd484003a907e60ff8d0eff8fa887">d_alpha</a> = alpha;
<a name="l00149"></a>00149 <a class="code" href="classgr__single__pole__iir.html#a5e0f640e76cd29ba756d962097ede891">d_one_minus_alpha</a> = 1.0 - alpha;
<a name="l00150"></a>00150 }
<a name="l00151"></a>00151 <span class="comment"></span>
<a name="l00152"></a>00152 <span class="comment"> //! reset state to zero</span>
<a name="l00153"></a><a class="code" href="classgr__single__pole__iir_3_01gr__complex_00_01i__type_00_01double_01_4.html#a93048bf18a6017347b42c6395564981b">00153</a> <span class="comment"></span> <span class="keywordtype">void</span> <a class="code" href="classgr__single__pole__iir.html#aec64a97520727ae05377c782b44b6062" title="reset state to zero">reset</a> ()
<a name="l00154"></a>00154 {
<a name="l00155"></a>00155 <a class="code" href="classgr__single__pole__iir.html#a896007d3ed8be78894c19a6f58fd870f">d_prev_output</a> = 0;
<a name="l00156"></a>00156 }
<a name="l00157"></a>00157
<a name="l00158"></a><a class="code" href="classgr__single__pole__iir_3_01gr__complex_00_01i__type_00_01double_01_4.html#a443a747cd842732ea49484d871212ed0">00158</a> <a class="code" href="gr__complex_8h.html#a90c065671dd1c4b7aed7e08b265e23f7">gr_complexd</a> <a class="code" href="classgr__single__pole__iir_3_01gr__complex_00_01i__type_00_01double_01_4.html#a443a747cd842732ea49484d871212ed0">prev_output</a> () { <span class="keywordflow">return</span> <a class="code" href="classgr__single__pole__iir.html#a896007d3ed8be78894c19a6f58fd870f">d_prev_output</a>; }
<a name="l00159"></a>00159
<a name="l00160"></a>00160 <span class="keyword">protected</span>:
<a name="l00161"></a><a class="code" href="classgr__single__pole__iir_3_01gr__complex_00_01i__type_00_01double_01_4.html#a2609b118c141b19665d16e18cc37cf0e">00161</a> <span class="keywordtype">double</span> <a class="code" href="classgr__single__pole__iir_3_01gr__complex_00_01i__type_00_01double_01_4.html#a2609b118c141b19665d16e18cc37cf0e">d_alpha</a>;
<a name="l00162"></a><a class="code" href="classgr__single__pole__iir_3_01gr__complex_00_01i__type_00_01double_01_4.html#af5a95fc377d50f3b1f74a4258fdfb9df">00162</a> <span class="keywordtype">double</span> <a class="code" href="classgr__single__pole__iir_3_01gr__complex_00_01i__type_00_01double_01_4.html#af5a95fc377d50f3b1f74a4258fdfb9df">d_one_minus_alpha</a>;
<a name="l00163"></a><a class="code" href="classgr__single__pole__iir_3_01gr__complex_00_01i__type_00_01double_01_4.html#a89dcb1aebab3a22b2fa5186238f696d8">00163</a> <a class="code" href="gr__complex_8h.html#a90c065671dd1c4b7aed7e08b265e23f7">gr_complexd</a> <a class="code" href="classgr__single__pole__iir_3_01gr__complex_00_01i__type_00_01double_01_4.html#a89dcb1aebab3a22b2fa5186238f696d8">d_prev_output</a>;
<a name="l00164"></a>00164 };
<a name="l00165"></a>00165
<a name="l00166"></a>00166 <span class="keyword">template</span>< <span class="keyword">class</span> i_type>
<a name="l00167"></a>00167 <a class="code" href="gr__complex_8h.html#aec4bfe41433369afae9327f1b0bc9109">gr_complex</a>
<a name="l00168"></a><a class="code" href="classgr__single__pole__iir_3_01gr__complex_00_01i__type_00_01double_01_4.html#aa833356db2d31691b39b166efd615880">00168</a> <a class="code" href="classgr__single__pole__iir.html#ad8cecedbfed0bc1f24524d08914288c7" title="compute a single output value.">gr_single_pole_iir<gr_complex, i_type, double>::filter</a> (<span class="keyword">const</span> i_type input)
<a name="l00169"></a>00169 {
<a name="l00170"></a>00170 <a class="code" href="gr__complex_8h.html#a90c065671dd1c4b7aed7e08b265e23f7">gr_complexd</a> output;
<a name="l00171"></a>00171
<a name="l00172"></a>00172 output = <a class="code" href="classgr__single__pole__iir.html#a3cecd484003a907e60ff8d0eff8fa887">d_alpha</a> * (<a class="code" href="gr__complex_8h.html#a90c065671dd1c4b7aed7e08b265e23f7">gr_complexd</a>)input + <a class="code" href="classgr__single__pole__iir.html#a5e0f640e76cd29ba756d962097ede891">d_one_minus_alpha</a> * <a class="code" href="classgr__single__pole__iir.html#a896007d3ed8be78894c19a6f58fd870f">d_prev_output</a>;
<a name="l00173"></a>00173 <a class="code" href="classgr__single__pole__iir.html#a896007d3ed8be78894c19a6f58fd870f">d_prev_output</a> = output;
<a name="l00174"></a>00174
<a name="l00175"></a>00175 <span class="keywordflow">return</span> (<a class="code" href="gr__complex_8h.html#aec4bfe41433369afae9327f1b0bc9109">gr_complex</a>) output;
<a name="l00176"></a>00176 }
<a name="l00177"></a>00177
<a name="l00178"></a>00178 <span class="comment">//Do we need to specialize this, although it is the same as the general case?</span>
<a name="l00179"></a>00179
<a name="l00180"></a>00180 <span class="keyword">template</span><<span class="keyword">class</span> i_type>
<a name="l00181"></a>00181 <span class="keywordtype">void</span>
<a name="l00182"></a><a class="code" href="classgr__single__pole__iir_3_01gr__complex_00_01i__type_00_01double_01_4.html#a8e96513599ab00798aac14f76b451ca2">00182</a> <a class="code" href="classgr__single__pole__iir.html#aabd52c15f1973d6e75d8aad3a2c6381c" title="compute an array of N output values. input must have n valid entries.">gr_single_pole_iir<gr_complex, i_type, double>::filterN</a> (<a class="code" href="gr__complex_8h.html#aec4bfe41433369afae9327f1b0bc9109">gr_complex</a> output[],
<a name="l00183"></a>00183 <span class="keyword">const</span> i_type input[],
<a name="l00184"></a>00184 <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> n)
<a name="l00185"></a>00185 {
<a name="l00186"></a>00186 <span class="keywordflow">for</span> (<span class="keywordtype">unsigned</span> i = 0; i < n; i++)
<a name="l00187"></a>00187 output[i] = <a class="code" href="classgr__single__pole__iir.html#ad8cecedbfed0bc1f24524d08914288c7" title="compute a single output value.">filter</a> (input[i]);
<a name="l00188"></a>00188 }
<a name="l00189"></a>00189
<a name="l00190"></a>00190 <span class="preprocessor">#endif </span><span class="comment">/* _GR_SINGLE_POLE_IIR_H_ */</span>
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