<!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"/> <meta http-equiv="X-UA-Compatible" content="IE=9"/> <meta name="generator" content="Doxygen 1.8.3"/> <title>GNU Radio 3.6.4.1 C++ API: firdes.h Source File</title> <link href="tabs.css" rel="stylesheet" type="text/css"/> <script type="text/javascript" src="jquery.js"></script> <script type="text/javascript" src="dynsections.js"></script> <link href="navtree.css" rel="stylesheet" type="text/css"/> <script type="text/javascript" src="resize.js"></script> <script type="text/javascript" src="navtree.js"></script> <script type="text/javascript"> $(document).ready(initResizable); $(window).load(resizeHeight); </script> <link href="doxygen.css" rel="stylesheet" type="text/css" /> </head> <body> <div id="top"><!-- do not remove this div, it is closed by doxygen! --> <div id="titlearea"> <table cellspacing="0" cellpadding="0"> <tbody> <tr style="height: 56px;"> <td style="padding-left: 0.5em;"> <div id="projectname">GNU Radio 3.6.4.1 C++ API </div> </td> </tr> </tbody> </table> </div> <!-- end header part --> <!-- Generated by Doxygen 1.8.3 --> </div><!-- top --> <div id="side-nav" class="ui-resizable side-nav-resizable"> <div id="nav-tree"> <div id="nav-tree-contents"> <div id="nav-sync" class="sync"></div> </div> </div> <div id="splitbar" style="-moz-user-select:none;" class="ui-resizable-handle"> </div> </div> <script type="text/javascript"> $(document).ready(function(){initNavTree('firdes_8h_source.html','');}); </script> <div id="doc-content"> <div class="header"> <div class="headertitle"> <div class="title">firdes.h</div> </div> </div><!--header--> <div class="contents"> <a href="firdes_8h.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="comment">/* -*- c++ -*- */</span></div> <div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="comment">/*</span></div> <div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment"> * Copyright 2002,2008,2012 Free Software Foundation, Inc.</span></div> <div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment"> *</span></div> <div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="comment"> * This file is part of GNU Radio</span></div> <div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="comment"> *</span></div> <div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="comment"> * GNU Radio is free software; you can redistribute it and/or modify</span></div> <div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="comment"> * it under the terms of the GNU General Public License as published by</span></div> <div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="comment"> * the Free Software Foundation; either version 3, or (at your option)</span></div> <div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="comment"> * any later version.</span></div> <div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="comment"> *</span></div> <div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="comment"> * GNU Radio is distributed in the hope that it will be useful,</span></div> <div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="comment"> * but WITHOUT ANY WARRANTY; without even the implied warranty of</span></div> <div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="comment"> * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the</span></div> <div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="comment"> * GNU General Public License for more details.</span></div> <div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="comment"> *</span></div> <div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="comment"> * You should have received a copy of the GNU General Public License</span></div> <div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="comment"> * along with GNU Radio; see the file COPYING. If not, write to</span></div> <div class="line"><a name="l00019"></a><span class="lineno"> 19</span> <span class="comment"> * the Free Software Foundation, Inc., 51 Franklin Street,</span></div> <div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="comment"> * Boston, MA 02110-1301, USA.</span></div> <div class="line"><a name="l00021"></a><span class="lineno"> 21</span> <span class="comment"> */</span></div> <div class="line"><a name="l00022"></a><span class="lineno"> 22</span> </div> <div class="line"><a name="l00023"></a><span class="lineno"> 23</span> <span class="preprocessor">#ifndef _FILTER_FIRDES_H_</span></div> <div class="line"><a name="l00024"></a><span class="lineno"> 24</span> <span class="preprocessor"></span><span class="preprocessor">#define _FILTER_FIRDES_H_</span></div> <div class="line"><a name="l00025"></a><span class="lineno"> 25</span> <span class="preprocessor"></span></div> <div class="line"><a name="l00026"></a><span class="lineno"> 26</span> <span class="preprocessor">#include <<a class="code" href="gr-filter_2include_2filter_2api_8h.html">filter/api.h</a>></span></div> <div class="line"><a name="l00027"></a><span class="lineno"> 27</span> <span class="preprocessor">#include <vector></span></div> <div class="line"><a name="l00028"></a><span class="lineno"> 28</span> <span class="preprocessor">#include <cmath></span></div> <div class="line"><a name="l00029"></a><span class="lineno"> 29</span> <span class="preprocessor">#include <<a class="code" href="gr__complex_8h.html">gr_complex.h</a>></span></div> <div class="line"><a name="l00030"></a><span class="lineno"> 30</span> </div> <div class="line"><a name="l00031"></a><span class="lineno"> 31</span> <span class="keyword">namespace </span>gr {</div> <div class="line"><a name="l00032"></a><span class="lineno"> 32</span>  <span class="keyword">namespace </span>filter {</div> <div class="line"><a name="l00033"></a><span class="lineno"> 33</span> <span class="comment"></span></div> <div class="line"><a name="l00034"></a><span class="lineno"> 34</span> <span class="comment"> /*!</span></div> <div class="line"><a name="l00035"></a><span class="lineno"> 35</span> <span class="comment"> * \brief Finite Impulse Response (FIR) filter design functions.</span></div> <div class="line"><a name="l00036"></a><span class="lineno"> 36</span> <span class="comment"> * \ingroup filter_design</span></div> <div class="line"><a name="l00037"></a><span class="lineno"> 37</span> <span class="comment"> */</span></div> <div class="line"><a name="l00038"></a><span class="lineno"> 38</span>  </div> <div class="line"><a name="l00039"></a><span class="lineno"><a class="code" href="classgr_1_1filter_1_1firdes.html"> 39</a></span>  <span class="keyword">class </span><a class="code" href="gr-filter_2include_2filter_2api_8h.html#a7d33c890adb08fbd7c1c524f2c889357">FILTER_API</a> <a class="code" href="classgr_1_1filter_1_1firdes.html" title="Finite Impulse Response (FIR) filter design functions.">firdes</a> {</div> <div class="line"><a name="l00040"></a><span class="lineno"> 40</span>  <span class="keyword">public</span>:</div> <div class="line"><a name="l00041"></a><span class="lineno"> 41</span>  </div> <div class="line"><a name="l00042"></a><span class="lineno"><a class="code" href="classgr_1_1filter_1_1firdes.html#a5527e5ee7713055268448c55b1b235a9"> 42</a></span>  <span class="keyword">enum</span> <a class="code" href="classgr_1_1filter_1_1firdes.html#a5527e5ee7713055268448c55b1b235a9">win_type</a> {</div> <div class="line"><a name="l00043"></a><span class="lineno"><a class="code" href="classgr_1_1filter_1_1firdes.html#a5527e5ee7713055268448c55b1b235a9a8ecd24e72826deef18f376646ad3ec95"> 43</a></span>  WIN_HAMMING = 0, <span class="comment">// max attenuation 53 dB</span></div> <div class="line"><a name="l00044"></a><span class="lineno"><a class="code" href="classgr_1_1filter_1_1firdes.html#a5527e5ee7713055268448c55b1b235a9a082fccca16caae201f2da9fc2531a827"> 44</a></span>  WIN_HANN = 1, <span class="comment">// max attenuation 44 dB</span></div> <div class="line"><a name="l00045"></a><span class="lineno"><a class="code" href="classgr_1_1filter_1_1firdes.html#a5527e5ee7713055268448c55b1b235a9aada50ccfbac560bf7f9e2f469db6ed5a"> 45</a></span>  WIN_BLACKMAN = 2, <span class="comment">// max attenuation 74 dB</span></div> <div class="line"><a name="l00046"></a><span class="lineno"><a class="code" href="classgr_1_1filter_1_1firdes.html#a5527e5ee7713055268448c55b1b235a9a26810a2831833c94347ad7d1e978c1c5"> 46</a></span>  WIN_RECTANGULAR = 3,</div> <div class="line"><a name="l00047"></a><span class="lineno"><a class="code" href="classgr_1_1filter_1_1firdes.html#a5527e5ee7713055268448c55b1b235a9a81c930d6a1b64486c9321fe64e27d4ce"> 47</a></span>  WIN_KAISER = 4, <span class="comment">// max attenuation a function of beta, google it</span></div> <div class="line"><a name="l00048"></a><span class="lineno"><a class="code" href="classgr_1_1filter_1_1firdes.html#a5527e5ee7713055268448c55b1b235a9ac79ce2faa8899fdc01091c3791c5e0d8"> 48</a></span>  WIN_BLACKMAN_hARRIS = 5,</div> <div class="line"><a name="l00049"></a><span class="lineno"><a class="code" href="classgr_1_1filter_1_1firdes.html#a5527e5ee7713055268448c55b1b235a9ac9864fa124129bc08fdd6f514eb657f9"> 49</a></span>  WIN_BLACKMAN_HARRIS = 5, <span class="comment">// alias for capitalization consistency</span></div> <div class="line"><a name="l00050"></a><span class="lineno"> 50</span>  };</div> <div class="line"><a name="l00051"></a><span class="lineno"> 51</span> </div> <div class="line"><a name="l00052"></a><span class="lineno"> 52</span> </div> <div class="line"><a name="l00053"></a><span class="lineno"> 53</span>  <span class="comment">// ... class methods ...</span></div> <div class="line"><a name="l00054"></a><span class="lineno"> 54</span>  <span class="comment"></span></div> <div class="line"><a name="l00055"></a><span class="lineno"> 55</span> <span class="comment"> /*!</span></div> <div class="line"><a name="l00056"></a><span class="lineno"> 56</span> <span class="comment"> * \brief use "window method" to design a low-pass FIR filter</span></div> <div class="line"><a name="l00057"></a><span class="lineno"> 57</span> <span class="comment"> *</span></div> <div class="line"><a name="l00058"></a><span class="lineno"> 58</span> <span class="comment"> * \p gain: overall gain of filter (typically 1.0)</span></div> <div class="line"><a name="l00059"></a><span class="lineno"> 59</span> <span class="comment"> * \p sampling_freq: sampling freq (Hz)</span></div> <div class="line"><a name="l00060"></a><span class="lineno"> 60</span> <span class="comment"> * \p cutoff_freq: center of transition band (Hz)</span></div> <div class="line"><a name="l00061"></a><span class="lineno"> 61</span> <span class="comment"> * \p transition_width: width of transition band (Hz).</span></div> <div class="line"><a name="l00062"></a><span class="lineno"> 62</span> <span class="comment"> * The normalized width of the transition</span></div> <div class="line"><a name="l00063"></a><span class="lineno"> 63</span> <span class="comment"> * band is what sets the number of taps</span></div> <div class="line"><a name="l00064"></a><span class="lineno"> 64</span> <span class="comment"> * required. Narrow --> more taps</span></div> <div class="line"><a name="l00065"></a><span class="lineno"> 65</span> <span class="comment"> * \p window_type: What kind of window to use. Determines</span></div> <div class="line"><a name="l00066"></a><span class="lineno"> 66</span> <span class="comment"> * maximum attenuation and passband ripple.</span></div> <div class="line"><a name="l00067"></a><span class="lineno"> 67</span> <span class="comment"> * \p beta: parameter for Kaiser window</span></div> <div class="line"><a name="l00068"></a><span class="lineno"> 68</span> <span class="comment"> */</span></div> <div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  <span class="keyword">static</span> std::vector<float></div> <div class="line"><a name="l00070"></a><span class="lineno"> 70</span>  low_pass(<span class="keywordtype">double</span> gain,</div> <div class="line"><a name="l00071"></a><span class="lineno"> 71</span>  <span class="keywordtype">double</span> sampling_freq,</div> <div class="line"><a name="l00072"></a><span class="lineno"> 72</span>  <span class="keywordtype">double</span> cutoff_freq, <span class="comment">// Hz center of transition band</span></div> <div class="line"><a name="l00073"></a><span class="lineno"> 73</span>  <span class="keywordtype">double</span> transition_width, <span class="comment">// Hz width of transition band</span></div> <div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  win_type window = WIN_HAMMING,</div> <div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  <span class="keywordtype">double</span> beta = 6.76); <span class="comment">// used only with Kaiser</span></div> <div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  <span class="comment"></span></div> <div class="line"><a name="l00077"></a><span class="lineno"> 77</span> <span class="comment"> /*!</span></div> <div class="line"><a name="l00078"></a><span class="lineno"> 78</span> <span class="comment"> * \brief use "window method" to design a low-pass FIR filter</span></div> <div class="line"><a name="l00079"></a><span class="lineno"> 79</span> <span class="comment"> *</span></div> <div class="line"><a name="l00080"></a><span class="lineno"> 80</span> <span class="comment"> * \p gain: overall gain of filter (typically 1.0)</span></div> <div class="line"><a name="l00081"></a><span class="lineno"> 81</span> <span class="comment"> * \p sampling_freq: sampling freq (Hz)</span></div> <div class="line"><a name="l00082"></a><span class="lineno"> 82</span> <span class="comment"> * \p cutoff_freq: center of transition band (Hz)</span></div> <div class="line"><a name="l00083"></a><span class="lineno"> 83</span> <span class="comment"> * \p transition_width: width of transition band (Hz).</span></div> <div class="line"><a name="l00084"></a><span class="lineno"> 84</span> <span class="comment"> * \p attenuation_dB required stopband attenuation</span></div> <div class="line"><a name="l00085"></a><span class="lineno"> 85</span> <span class="comment"> * The normalized width of the transition</span></div> <div class="line"><a name="l00086"></a><span class="lineno"> 86</span> <span class="comment"> * band and the required stop band</span></div> <div class="line"><a name="l00087"></a><span class="lineno"> 87</span> <span class="comment"> * attenuation is what sets the number of taps</span></div> <div class="line"><a name="l00088"></a><span class="lineno"> 88</span> <span class="comment"> * required. Narrow --> more taps</span></div> <div class="line"><a name="l00089"></a><span class="lineno"> 89</span> <span class="comment"> * More attenuatin --> more taps</span></div> <div class="line"><a name="l00090"></a><span class="lineno"> 90</span> <span class="comment"> * \p window_type: What kind of window to use. Determines</span></div> <div class="line"><a name="l00091"></a><span class="lineno"> 91</span> <span class="comment"> * maximum attenuation and passband ripple.</span></div> <div class="line"><a name="l00092"></a><span class="lineno"> 92</span> <span class="comment"> * \p beta: parameter for Kaiser window</span></div> <div class="line"><a name="l00093"></a><span class="lineno"> 93</span> <span class="comment"> */</span></div> <div class="line"><a name="l00094"></a><span class="lineno"> 94</span> </div> <div class="line"><a name="l00095"></a><span class="lineno"> 95</span>  <span class="keyword">static</span> std::vector<float></div> <div class="line"><a name="l00096"></a><span class="lineno"> 96</span>  low_pass_2(<span class="keywordtype">double</span> gain,</div> <div class="line"><a name="l00097"></a><span class="lineno"> 97</span>  <span class="keywordtype">double</span> sampling_freq,</div> <div class="line"><a name="l00098"></a><span class="lineno"> 98</span>  <span class="keywordtype">double</span> cutoff_freq, <span class="comment">// Hz beginning transition band</span></div> <div class="line"><a name="l00099"></a><span class="lineno"> 99</span>  <span class="keywordtype">double</span> transition_width, <span class="comment">// Hz width of transition band</span></div> <div class="line"><a name="l00100"></a><span class="lineno"> 100</span>  <span class="keywordtype">double</span> attenuation_dB, <span class="comment">// out of band attenuation dB</span></div> <div class="line"><a name="l00101"></a><span class="lineno"> 101</span>  win_type window = WIN_HAMMING,</div> <div class="line"><a name="l00102"></a><span class="lineno"> 102</span>  <span class="keywordtype">double</span> beta = 6.76); <span class="comment">// used only with Kaiser</span></div> <div class="line"><a name="l00103"></a><span class="lineno"> 103</span> <span class="comment"></span></div> <div class="line"><a name="l00104"></a><span class="lineno"> 104</span> <span class="comment"> /*!</span></div> <div class="line"><a name="l00105"></a><span class="lineno"> 105</span> <span class="comment"> * \brief use "window method" to design a high-pass FIR filter</span></div> <div class="line"><a name="l00106"></a><span class="lineno"> 106</span> <span class="comment"> *</span></div> <div class="line"><a name="l00107"></a><span class="lineno"> 107</span> <span class="comment"> * \p gain: overall gain of filter (typically 1.0)</span></div> <div class="line"><a name="l00108"></a><span class="lineno"> 108</span> <span class="comment"> * \p sampling_freq: sampling freq (Hz)</span></div> <div class="line"><a name="l00109"></a><span class="lineno"> 109</span> <span class="comment"> * \p cutoff_freq: center of transition band (Hz)</span></div> <div class="line"><a name="l00110"></a><span class="lineno"> 110</span> <span class="comment"> * \p transition_width: width of transition band (Hz).</span></div> <div class="line"><a name="l00111"></a><span class="lineno"> 111</span> <span class="comment"> * The normalized width of the transition</span></div> <div class="line"><a name="l00112"></a><span class="lineno"> 112</span> <span class="comment"> * band is what sets the number of taps</span></div> <div class="line"><a name="l00113"></a><span class="lineno"> 113</span> <span class="comment"> * required. Narrow --> more taps</span></div> <div class="line"><a name="l00114"></a><span class="lineno"> 114</span> <span class="comment"> * \p window_type: What kind of window to use. Determines</span></div> <div class="line"><a name="l00115"></a><span class="lineno"> 115</span> <span class="comment"> * maximum attenuation and passband ripple.</span></div> <div class="line"><a name="l00116"></a><span class="lineno"> 116</span> <span class="comment"> * \p beta: parameter for Kaiser window</span></div> <div class="line"><a name="l00117"></a><span class="lineno"> 117</span> <span class="comment"> */</span></div> <div class="line"><a name="l00118"></a><span class="lineno"> 118</span>  </div> <div class="line"><a name="l00119"></a><span class="lineno"> 119</span>  <span class="keyword">static</span> std::vector<float></div> <div class="line"><a name="l00120"></a><span class="lineno"> 120</span>  high_pass(<span class="keywordtype">double</span> gain,</div> <div class="line"><a name="l00121"></a><span class="lineno"> 121</span>  <span class="keywordtype">double</span> sampling_freq,</div> <div class="line"><a name="l00122"></a><span class="lineno"> 122</span>  <span class="keywordtype">double</span> cutoff_freq, <span class="comment">// Hz center of transition band</span></div> <div class="line"><a name="l00123"></a><span class="lineno"> 123</span>  <span class="keywordtype">double</span> transition_width, <span class="comment">// Hz width of transition band</span></div> <div class="line"><a name="l00124"></a><span class="lineno"> 124</span>  win_type window = WIN_HAMMING,</div> <div class="line"><a name="l00125"></a><span class="lineno"> 125</span>  <span class="keywordtype">double</span> beta = 6.76); <span class="comment">// used only with Kaiser</span></div> <div class="line"><a name="l00126"></a><span class="lineno"> 126</span> <span class="comment"></span></div> <div class="line"><a name="l00127"></a><span class="lineno"> 127</span> <span class="comment"> /*!</span></div> <div class="line"><a name="l00128"></a><span class="lineno"> 128</span> <span class="comment"> * \brief use "window method" to design a high-pass FIR filter</span></div> <div class="line"><a name="l00129"></a><span class="lineno"> 129</span> <span class="comment"> *</span></div> <div class="line"><a name="l00130"></a><span class="lineno"> 130</span> <span class="comment"> * \p gain: overall gain of filter (typically 1.0)</span></div> <div class="line"><a name="l00131"></a><span class="lineno"> 131</span> <span class="comment"> * \p sampling_freq: sampling freq (Hz)</span></div> <div class="line"><a name="l00132"></a><span class="lineno"> 132</span> <span class="comment"> * \p cutoff_freq: center of transition band (Hz)</span></div> <div class="line"><a name="l00133"></a><span class="lineno"> 133</span> <span class="comment"> * \p transition_width: width of transition band (Hz).</span></div> <div class="line"><a name="l00134"></a><span class="lineno"> 134</span> <span class="comment"> * \p attenuation_dB out of band attenuation</span></div> <div class="line"><a name="l00135"></a><span class="lineno"> 135</span> <span class="comment"> * The normalized width of the transition</span></div> <div class="line"><a name="l00136"></a><span class="lineno"> 136</span> <span class="comment"> * band and the required stop band</span></div> <div class="line"><a name="l00137"></a><span class="lineno"> 137</span> <span class="comment"> * attenuation is what sets the number of taps</span></div> <div class="line"><a name="l00138"></a><span class="lineno"> 138</span> <span class="comment"> * required. Narrow --> more taps</span></div> <div class="line"><a name="l00139"></a><span class="lineno"> 139</span> <span class="comment"> * More attenuation --> more taps</span></div> <div class="line"><a name="l00140"></a><span class="lineno"> 140</span> <span class="comment"> * \p window_type: What kind of window to use. Determines</span></div> <div class="line"><a name="l00141"></a><span class="lineno"> 141</span> <span class="comment"> * maximum attenuation and passband ripple.</span></div> <div class="line"><a name="l00142"></a><span class="lineno"> 142</span> <span class="comment"> * \p beta: parameter for Kaiser window</span></div> <div class="line"><a name="l00143"></a><span class="lineno"> 143</span> <span class="comment"> */</span></div> <div class="line"><a name="l00144"></a><span class="lineno"> 144</span>  </div> <div class="line"><a name="l00145"></a><span class="lineno"> 145</span>  <span class="keyword">static</span> std::vector<float></div> <div class="line"><a name="l00146"></a><span class="lineno"> 146</span>  high_pass_2(<span class="keywordtype">double</span> gain,</div> <div class="line"><a name="l00147"></a><span class="lineno"> 147</span>  <span class="keywordtype">double</span> sampling_freq,</div> <div class="line"><a name="l00148"></a><span class="lineno"> 148</span>  <span class="keywordtype">double</span> cutoff_freq, <span class="comment">// Hz center of transition band</span></div> <div class="line"><a name="l00149"></a><span class="lineno"> 149</span>  <span class="keywordtype">double</span> transition_width, <span class="comment">// Hz width of transition band</span></div> <div class="line"><a name="l00150"></a><span class="lineno"> 150</span>  <span class="keywordtype">double</span> attenuation_dB, <span class="comment">// out of band attenuation dB</span></div> <div class="line"><a name="l00151"></a><span class="lineno"> 151</span>  win_type window = WIN_HAMMING,</div> <div class="line"><a name="l00152"></a><span class="lineno"> 152</span>  <span class="keywordtype">double</span> beta = 6.76); <span class="comment">// used only with Kaiser</span></div> <div class="line"><a name="l00153"></a><span class="lineno"> 153</span>  <span class="comment"></span></div> <div class="line"><a name="l00154"></a><span class="lineno"> 154</span> <span class="comment"> /*!</span></div> <div class="line"><a name="l00155"></a><span class="lineno"> 155</span> <span class="comment"> * \brief use "window method" to design a band-pass FIR filter</span></div> <div class="line"><a name="l00156"></a><span class="lineno"> 156</span> <span class="comment"> *</span></div> <div class="line"><a name="l00157"></a><span class="lineno"> 157</span> <span class="comment"> * \p gain: overall gain of filter (typically 1.0)</span></div> <div class="line"><a name="l00158"></a><span class="lineno"> 158</span> <span class="comment"> * \p sampling_freq: sampling freq (Hz)</span></div> <div class="line"><a name="l00159"></a><span class="lineno"> 159</span> <span class="comment"> * \p low_cutoff_freq: center of transition band (Hz)</span></div> <div class="line"><a name="l00160"></a><span class="lineno"> 160</span> <span class="comment"> * \p high_cutoff_freq: center of transition band (Hz)</span></div> <div class="line"><a name="l00161"></a><span class="lineno"> 161</span> <span class="comment"> * \p transition_width: width of transition band (Hz).</span></div> <div class="line"><a name="l00162"></a><span class="lineno"> 162</span> <span class="comment"> * The normalized width of the transition</span></div> <div class="line"><a name="l00163"></a><span class="lineno"> 163</span> <span class="comment"> * band is what sets the number of taps</span></div> <div class="line"><a name="l00164"></a><span class="lineno"> 164</span> <span class="comment"> * required. Narrow --> more taps</span></div> <div class="line"><a name="l00165"></a><span class="lineno"> 165</span> <span class="comment"> * \p window_type: What kind of window to use. Determines</span></div> <div class="line"><a name="l00166"></a><span class="lineno"> 166</span> <span class="comment"> * maximum attenuation and passband ripple.</span></div> <div class="line"><a name="l00167"></a><span class="lineno"> 167</span> <span class="comment"> * \p beta: parameter for Kaiser window</span></div> <div class="line"><a name="l00168"></a><span class="lineno"> 168</span> <span class="comment"> */</span></div> <div class="line"><a name="l00169"></a><span class="lineno"> 169</span>  <span class="keyword">static</span> std::vector<float></div> <div class="line"><a name="l00170"></a><span class="lineno"> 170</span>  band_pass(<span class="keywordtype">double</span> gain,</div> <div class="line"><a name="l00171"></a><span class="lineno"> 171</span>  <span class="keywordtype">double</span> sampling_freq,</div> <div class="line"><a name="l00172"></a><span class="lineno"> 172</span>  <span class="keywordtype">double</span> low_cutoff_freq, <span class="comment">// Hz center of transition band</span></div> <div class="line"><a name="l00173"></a><span class="lineno"> 173</span>  <span class="keywordtype">double</span> high_cutoff_freq, <span class="comment">// Hz center of transition band</span></div> <div class="line"><a name="l00174"></a><span class="lineno"> 174</span>  <span class="keywordtype">double</span> transition_width, <span class="comment">// Hz width of transition band</span></div> <div class="line"><a name="l00175"></a><span class="lineno"> 175</span>  win_type window = WIN_HAMMING,</div> <div class="line"><a name="l00176"></a><span class="lineno"> 176</span>  <span class="keywordtype">double</span> beta = 6.76); <span class="comment">// used only with Kaiser</span></div> <div class="line"><a name="l00177"></a><span class="lineno"> 177</span>  <span class="comment"></span></div> <div class="line"><a name="l00178"></a><span class="lineno"> 178</span> <span class="comment"> /*!</span></div> <div class="line"><a name="l00179"></a><span class="lineno"> 179</span> <span class="comment"> * \brief use "window method" to design a band-pass FIR filter</span></div> <div class="line"><a name="l00180"></a><span class="lineno"> 180</span> <span class="comment"> *</span></div> <div class="line"><a name="l00181"></a><span class="lineno"> 181</span> <span class="comment"> * \p gain: overall gain of filter (typically 1.0)</span></div> <div class="line"><a name="l00182"></a><span class="lineno"> 182</span> <span class="comment"> * \p sampling_freq: sampling freq (Hz)</span></div> <div class="line"><a name="l00183"></a><span class="lineno"> 183</span> <span class="comment"> * \p low_cutoff_freq: center of transition band (Hz)</span></div> <div class="line"><a name="l00184"></a><span class="lineno"> 184</span> <span class="comment"> * \p high_cutoff_freq: center of transition band (Hz)</span></div> <div class="line"><a name="l00185"></a><span class="lineno"> 185</span> <span class="comment"> * \p transition_width: width of transition band (Hz).</span></div> <div class="line"><a name="l00186"></a><span class="lineno"> 186</span> <span class="comment"> * \p attenuation_dB out of band attenuation</span></div> <div class="line"><a name="l00187"></a><span class="lineno"> 187</span> <span class="comment"> * The normalized width of the transition</span></div> <div class="line"><a name="l00188"></a><span class="lineno"> 188</span> <span class="comment"> * band and the required stop band</span></div> <div class="line"><a name="l00189"></a><span class="lineno"> 189</span> <span class="comment"> * attenuation is what sets the number of taps</span></div> <div class="line"><a name="l00190"></a><span class="lineno"> 190</span> <span class="comment"> * required. Narrow --> more taps</span></div> <div class="line"><a name="l00191"></a><span class="lineno"> 191</span> <span class="comment"> * More attenuation --> more taps</span></div> <div class="line"><a name="l00192"></a><span class="lineno"> 192</span> <span class="comment"> * \p window_type: What kind of window to use. Determines</span></div> <div class="line"><a name="l00193"></a><span class="lineno"> 193</span> <span class="comment"> * maximum attenuation and passband ripple.</span></div> <div class="line"><a name="l00194"></a><span class="lineno"> 194</span> <span class="comment"> * \p beta: parameter for Kaiser window</span></div> <div class="line"><a name="l00195"></a><span class="lineno"> 195</span> <span class="comment"> */</span></div> <div class="line"><a name="l00196"></a><span class="lineno"> 196</span>  </div> <div class="line"><a name="l00197"></a><span class="lineno"> 197</span>  <span class="keyword">static</span> std::vector<float></div> <div class="line"><a name="l00198"></a><span class="lineno"> 198</span>  band_pass_2(<span class="keywordtype">double</span> gain,</div> <div class="line"><a name="l00199"></a><span class="lineno"> 199</span>  <span class="keywordtype">double</span> sampling_freq,</div> <div class="line"><a name="l00200"></a><span class="lineno"> 200</span>  <span class="keywordtype">double</span> low_cutoff_freq, <span class="comment">// Hz beginning transition band</span></div> <div class="line"><a name="l00201"></a><span class="lineno"> 201</span>  <span class="keywordtype">double</span> high_cutoff_freq, <span class="comment">// Hz beginning transition band</span></div> <div class="line"><a name="l00202"></a><span class="lineno"> 202</span>  <span class="keywordtype">double</span> transition_width, <span class="comment">// Hz width of transition band</span></div> <div class="line"><a name="l00203"></a><span class="lineno"> 203</span>  <span class="keywordtype">double</span> attenuation_dB, <span class="comment">// out of band attenuation dB</span></div> <div class="line"><a name="l00204"></a><span class="lineno"> 204</span>  win_type window = WIN_HAMMING,</div> <div class="line"><a name="l00205"></a><span class="lineno"> 205</span>  <span class="keywordtype">double</span> beta = 6.76); <span class="comment">// used only with Kaiser</span></div> <div class="line"><a name="l00206"></a><span class="lineno"> 206</span>  <span class="comment"></span></div> <div class="line"><a name="l00207"></a><span class="lineno"> 207</span> <span class="comment"> /*!</span></div> <div class="line"><a name="l00208"></a><span class="lineno"> 208</span> <span class="comment"> * \brief use "window method" to design a complex band-pass FIR filter</span></div> <div class="line"><a name="l00209"></a><span class="lineno"> 209</span> <span class="comment"> *</span></div> <div class="line"><a name="l00210"></a><span class="lineno"> 210</span> <span class="comment"> * \p gain: overall gain of filter (typically 1.0)</span></div> <div class="line"><a name="l00211"></a><span class="lineno"> 211</span> <span class="comment"> * \p sampling_freq: sampling freq (Hz)</span></div> <div class="line"><a name="l00212"></a><span class="lineno"> 212</span> <span class="comment"> * \p low_cutoff_freq: center of transition band (Hz)</span></div> <div class="line"><a name="l00213"></a><span class="lineno"> 213</span> <span class="comment"> * \p high_cutoff_freq: center of transition band (Hz)</span></div> <div class="line"><a name="l00214"></a><span class="lineno"> 214</span> <span class="comment"> * \p transition_width: width of transition band (Hz).</span></div> <div class="line"><a name="l00215"></a><span class="lineno"> 215</span> <span class="comment"> * The normalized width of the transition</span></div> <div class="line"><a name="l00216"></a><span class="lineno"> 216</span> <span class="comment"> * band is what sets the number of taps</span></div> <div class="line"><a name="l00217"></a><span class="lineno"> 217</span> <span class="comment"> * required. Narrow --> more taps</span></div> <div class="line"><a name="l00218"></a><span class="lineno"> 218</span> <span class="comment"> * \p window_type: What kind of window to use. Determines</span></div> <div class="line"><a name="l00219"></a><span class="lineno"> 219</span> <span class="comment"> * maximum attenuation and passband ripple.</span></div> <div class="line"><a name="l00220"></a><span class="lineno"> 220</span> <span class="comment"> * \p beta: parameter for Kaiser window</span></div> <div class="line"><a name="l00221"></a><span class="lineno"> 221</span> <span class="comment"> */</span></div> <div class="line"><a name="l00222"></a><span class="lineno"> 222</span>  <span class="keyword">static</span> std::vector<gr_complex></div> <div class="line"><a name="l00223"></a><span class="lineno"> 223</span>  complex_band_pass(<span class="keywordtype">double</span> gain,</div> <div class="line"><a name="l00224"></a><span class="lineno"> 224</span>  <span class="keywordtype">double</span> sampling_freq,</div> <div class="line"><a name="l00225"></a><span class="lineno"> 225</span>  <span class="keywordtype">double</span> low_cutoff_freq, <span class="comment">// Hz center of transition band</span></div> <div class="line"><a name="l00226"></a><span class="lineno"> 226</span>  <span class="keywordtype">double</span> high_cutoff_freq, <span class="comment">// Hz center of transition band</span></div> <div class="line"><a name="l00227"></a><span class="lineno"> 227</span>  <span class="keywordtype">double</span> transition_width, <span class="comment">// Hz width of transition band</span></div> <div class="line"><a name="l00228"></a><span class="lineno"> 228</span>  win_type window = WIN_HAMMING,</div> <div class="line"><a name="l00229"></a><span class="lineno"> 229</span>  <span class="keywordtype">double</span> beta = 6.76); <span class="comment">// used only with Kaiser</span></div> <div class="line"><a name="l00230"></a><span class="lineno"> 230</span>  <span class="comment"></span></div> <div class="line"><a name="l00231"></a><span class="lineno"> 231</span> <span class="comment"> /*!</span></div> <div class="line"><a name="l00232"></a><span class="lineno"> 232</span> <span class="comment"> * \brief use "window method" to design a complex band-pass FIR filter</span></div> <div class="line"><a name="l00233"></a><span class="lineno"> 233</span> <span class="comment"> *</span></div> <div class="line"><a name="l00234"></a><span class="lineno"> 234</span> <span class="comment"> * \p gain: overall gain of filter (typically 1.0)</span></div> <div class="line"><a name="l00235"></a><span class="lineno"> 235</span> <span class="comment"> * \p sampling_freq: sampling freq (Hz)</span></div> <div class="line"><a name="l00236"></a><span class="lineno"> 236</span> <span class="comment"> * \p low_cutoff_freq: center of transition band (Hz)</span></div> <div class="line"><a name="l00237"></a><span class="lineno"> 237</span> <span class="comment"> * \p high_cutoff_freq: center of transition band (Hz)</span></div> <div class="line"><a name="l00238"></a><span class="lineno"> 238</span> <span class="comment"> * \p transition_width: width of transition band (Hz).</span></div> <div class="line"><a name="l00239"></a><span class="lineno"> 239</span> <span class="comment"> * \p attenuation_dB out of band attenuation</span></div> <div class="line"><a name="l00240"></a><span class="lineno"> 240</span> <span class="comment"> * The normalized width of the transition</span></div> <div class="line"><a name="l00241"></a><span class="lineno"> 241</span> <span class="comment"> * band and the required stop band</span></div> <div class="line"><a name="l00242"></a><span class="lineno"> 242</span> <span class="comment"> * attenuation is what sets the number of taps</span></div> <div class="line"><a name="l00243"></a><span class="lineno"> 243</span> <span class="comment"> * required. Narrow --> more taps</span></div> <div class="line"><a name="l00244"></a><span class="lineno"> 244</span> <span class="comment"> * More attenuation --> more taps</span></div> <div class="line"><a name="l00245"></a><span class="lineno"> 245</span> <span class="comment"> * \p window_type: What kind of window to use. Determines</span></div> <div class="line"><a name="l00246"></a><span class="lineno"> 246</span> <span class="comment"> * maximum attenuation and passband ripple.</span></div> <div class="line"><a name="l00247"></a><span class="lineno"> 247</span> <span class="comment"> * \p beta: parameter for Kaiser window</span></div> <div class="line"><a name="l00248"></a><span class="lineno"> 248</span> <span class="comment"> */</span></div> <div class="line"><a name="l00249"></a><span class="lineno"> 249</span>  </div> <div class="line"><a name="l00250"></a><span class="lineno"> 250</span>  <span class="keyword">static</span> std::vector<gr_complex></div> <div class="line"><a name="l00251"></a><span class="lineno"> 251</span>  complex_band_pass_2(<span class="keywordtype">double</span> gain,</div> <div class="line"><a name="l00252"></a><span class="lineno"> 252</span>  <span class="keywordtype">double</span> sampling_freq,</div> <div class="line"><a name="l00253"></a><span class="lineno"> 253</span>  <span class="keywordtype">double</span> low_cutoff_freq, <span class="comment">// Hz beginning transition band</span></div> <div class="line"><a name="l00254"></a><span class="lineno"> 254</span>  <span class="keywordtype">double</span> high_cutoff_freq, <span class="comment">// Hz beginning transition band</span></div> <div class="line"><a name="l00255"></a><span class="lineno"> 255</span>  <span class="keywordtype">double</span> transition_width, <span class="comment">// Hz width of transition band</span></div> <div class="line"><a name="l00256"></a><span class="lineno"> 256</span>  <span class="keywordtype">double</span> attenuation_dB, <span class="comment">// out of band attenuation dB</span></div> <div class="line"><a name="l00257"></a><span class="lineno"> 257</span>  win_type window = WIN_HAMMING,</div> <div class="line"><a name="l00258"></a><span class="lineno"> 258</span>  <span class="keywordtype">double</span> beta = 6.76); <span class="comment">// used only with Kaiser</span></div> <div class="line"><a name="l00259"></a><span class="lineno"> 259</span>  <span class="comment"></span></div> <div class="line"><a name="l00260"></a><span class="lineno"> 260</span> <span class="comment"> /*!</span></div> <div class="line"><a name="l00261"></a><span class="lineno"> 261</span> <span class="comment"> * \brief use "window method" to design a band-reject FIR filter</span></div> <div class="line"><a name="l00262"></a><span class="lineno"> 262</span> <span class="comment"> *</span></div> <div class="line"><a name="l00263"></a><span class="lineno"> 263</span> <span class="comment"> * \p gain: overall gain of filter (typically 1.0)</span></div> <div class="line"><a name="l00264"></a><span class="lineno"> 264</span> <span class="comment"> * \p sampling_freq: sampling freq (Hz)</span></div> <div class="line"><a name="l00265"></a><span class="lineno"> 265</span> <span class="comment"> * \p low_cutoff_freq: center of transition band (Hz)</span></div> <div class="line"><a name="l00266"></a><span class="lineno"> 266</span> <span class="comment"> * \p high_cutoff_freq: center of transition band (Hz)</span></div> <div class="line"><a name="l00267"></a><span class="lineno"> 267</span> <span class="comment"> * \p transition_width: width of transition band (Hz).</span></div> <div class="line"><a name="l00268"></a><span class="lineno"> 268</span> <span class="comment"> * The normalized width of the transition</span></div> <div class="line"><a name="l00269"></a><span class="lineno"> 269</span> <span class="comment"> * band is what sets the number of taps</span></div> <div class="line"><a name="l00270"></a><span class="lineno"> 270</span> <span class="comment"> * required. Narrow --> more taps</span></div> <div class="line"><a name="l00271"></a><span class="lineno"> 271</span> <span class="comment"> * \p window_type: What kind of window to use. Determines</span></div> <div class="line"><a name="l00272"></a><span class="lineno"> 272</span> <span class="comment"> * maximum attenuation and passband ripple.</span></div> <div class="line"><a name="l00273"></a><span class="lineno"> 273</span> <span class="comment"> * \p beta: parameter for Kaiser window</span></div> <div class="line"><a name="l00274"></a><span class="lineno"> 274</span> <span class="comment"> */</span></div> <div class="line"><a name="l00275"></a><span class="lineno"> 275</span>  </div> <div class="line"><a name="l00276"></a><span class="lineno"> 276</span>  <span class="keyword">static</span> std::vector<float></div> <div class="line"><a name="l00277"></a><span class="lineno"> 277</span>  band_reject(<span class="keywordtype">double</span> gain,</div> <div class="line"><a name="l00278"></a><span class="lineno"> 278</span>  <span class="keywordtype">double</span> sampling_freq,</div> <div class="line"><a name="l00279"></a><span class="lineno"> 279</span>  <span class="keywordtype">double</span> low_cutoff_freq, <span class="comment">// Hz center of transition band</span></div> <div class="line"><a name="l00280"></a><span class="lineno"> 280</span>  <span class="keywordtype">double</span> high_cutoff_freq, <span class="comment">// Hz center of transition band</span></div> <div class="line"><a name="l00281"></a><span class="lineno"> 281</span>  <span class="keywordtype">double</span> transition_width, <span class="comment">// Hz width of transition band</span></div> <div class="line"><a name="l00282"></a><span class="lineno"> 282</span>  win_type window = WIN_HAMMING,</div> <div class="line"><a name="l00283"></a><span class="lineno"> 283</span>  <span class="keywordtype">double</span> beta = 6.76); <span class="comment">// used only with Kaiser</span></div> <div class="line"><a name="l00284"></a><span class="lineno"> 284</span>  <span class="comment"></span></div> <div class="line"><a name="l00285"></a><span class="lineno"> 285</span> <span class="comment"> /*!</span></div> <div class="line"><a name="l00286"></a><span class="lineno"> 286</span> <span class="comment"> * \brief use "window method" to design a band-reject FIR filter</span></div> <div class="line"><a name="l00287"></a><span class="lineno"> 287</span> <span class="comment"> *</span></div> <div class="line"><a name="l00288"></a><span class="lineno"> 288</span> <span class="comment"> * \p gain: overall gain of filter (typically 1.0)</span></div> <div class="line"><a name="l00289"></a><span class="lineno"> 289</span> <span class="comment"> * \p sampling_freq: sampling freq (Hz)</span></div> <div class="line"><a name="l00290"></a><span class="lineno"> 290</span> <span class="comment"> * \p low_cutoff_freq: center of transition band (Hz)</span></div> <div class="line"><a name="l00291"></a><span class="lineno"> 291</span> <span class="comment"> * \p high_cutoff_freq: center of transition band (Hz)</span></div> <div class="line"><a name="l00292"></a><span class="lineno"> 292</span> <span class="comment"> * \p transition_width: width of transition band (Hz).</span></div> <div class="line"><a name="l00293"></a><span class="lineno"> 293</span> <span class="comment"> * \p attenuation_dB out of band attenuation</span></div> <div class="line"><a name="l00294"></a><span class="lineno"> 294</span> <span class="comment"> * The normalized width of the transition</span></div> <div class="line"><a name="l00295"></a><span class="lineno"> 295</span> <span class="comment"> * band and the required stop band</span></div> <div class="line"><a name="l00296"></a><span class="lineno"> 296</span> <span class="comment"> * attenuation is what sets the number of taps</span></div> <div class="line"><a name="l00297"></a><span class="lineno"> 297</span> <span class="comment"> * required. Narrow --> more taps</span></div> <div class="line"><a name="l00298"></a><span class="lineno"> 298</span> <span class="comment"> * More attenuation --> more taps</span></div> <div class="line"><a name="l00299"></a><span class="lineno"> 299</span> <span class="comment"> * \p window_type: What kind of window to use. Determines</span></div> <div class="line"><a name="l00300"></a><span class="lineno"> 300</span> <span class="comment"> * maximum attenuation and passband ripple.</span></div> <div class="line"><a name="l00301"></a><span class="lineno"> 301</span> <span class="comment"> * \p beta: parameter for Kaiser window</span></div> <div class="line"><a name="l00302"></a><span class="lineno"> 302</span> <span class="comment"> */</span></div> <div class="line"><a name="l00303"></a><span class="lineno"> 303</span>  </div> <div class="line"><a name="l00304"></a><span class="lineno"> 304</span>  <span class="keyword">static</span> std::vector<float></div> <div class="line"><a name="l00305"></a><span class="lineno"> 305</span>  band_reject_2(<span class="keywordtype">double</span> gain,</div> <div class="line"><a name="l00306"></a><span class="lineno"> 306</span>  <span class="keywordtype">double</span> sampling_freq,</div> <div class="line"><a name="l00307"></a><span class="lineno"> 307</span>  <span class="keywordtype">double</span> low_cutoff_freq, <span class="comment">// Hz beginning transition band</span></div> <div class="line"><a name="l00308"></a><span class="lineno"> 308</span>  <span class="keywordtype">double</span> high_cutoff_freq, <span class="comment">// Hz beginning transition band</span></div> <div class="line"><a name="l00309"></a><span class="lineno"> 309</span>  <span class="keywordtype">double</span> transition_width, <span class="comment">// Hz width of transition band</span></div> <div class="line"><a name="l00310"></a><span class="lineno"> 310</span>  <span class="keywordtype">double</span> attenuation_dB, <span class="comment">// out of band attenuation dB</span></div> <div class="line"><a name="l00311"></a><span class="lineno"> 311</span>  win_type window = WIN_HAMMING,</div> <div class="line"><a name="l00312"></a><span class="lineno"> 312</span>  <span class="keywordtype">double</span> beta = 6.76); <span class="comment">// used only with Kaiser</span></div> <div class="line"><a name="l00313"></a><span class="lineno"> 313</span>  <span class="comment"></span></div> <div class="line"><a name="l00314"></a><span class="lineno"> 314</span> <span class="comment"> /*!\brief design a Hilbert Transform Filter</span></div> <div class="line"><a name="l00315"></a><span class="lineno"> 315</span> <span class="comment"> *</span></div> <div class="line"><a name="l00316"></a><span class="lineno"> 316</span> <span class="comment"> * \p ntaps: Number of taps, must be odd</span></div> <div class="line"><a name="l00317"></a><span class="lineno"> 317</span> <span class="comment"> * \p window_type: What kind of window to use</span></div> <div class="line"><a name="l00318"></a><span class="lineno"> 318</span> <span class="comment"> * \p beta: Only used for Kaiser</span></div> <div class="line"><a name="l00319"></a><span class="lineno"> 319</span> <span class="comment"> */</span></div> <div class="line"><a name="l00320"></a><span class="lineno"> 320</span>  <span class="keyword">static</span> std::vector<float></div> <div class="line"><a name="l00321"></a><span class="lineno"> 321</span>  hilbert(<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> ntaps = 19,</div> <div class="line"><a name="l00322"></a><span class="lineno"> 322</span>  win_type windowtype = WIN_RECTANGULAR,</div> <div class="line"><a name="l00323"></a><span class="lineno"> 323</span>  <span class="keywordtype">double</span> beta = 6.76);</div> <div class="line"><a name="l00324"></a><span class="lineno"> 324</span>  <span class="comment"></span></div> <div class="line"><a name="l00325"></a><span class="lineno"> 325</span> <span class="comment"> /*!</span></div> <div class="line"><a name="l00326"></a><span class="lineno"> 326</span> <span class="comment"> * \brief design a Root Cosine FIR Filter (do we need a window?)</span></div> <div class="line"><a name="l00327"></a><span class="lineno"> 327</span> <span class="comment"> *</span></div> <div class="line"><a name="l00328"></a><span class="lineno"> 328</span> <span class="comment"> * \p gain: overall gain of filter (typically 1.0)</span></div> <div class="line"><a name="l00329"></a><span class="lineno"> 329</span> <span class="comment"> * \p sampling_freq: sampling freq (Hz)</span></div> <div class="line"><a name="l00330"></a><span class="lineno"> 330</span> <span class="comment"> * \p symbol rate: symbol rate, must be a factor of sample rate</span></div> <div class="line"><a name="l00331"></a><span class="lineno"> 331</span> <span class="comment"> * \p alpha: excess bandwidth factor</span></div> <div class="line"><a name="l00332"></a><span class="lineno"> 332</span> <span class="comment"> * \p ntaps: number of taps</span></div> <div class="line"><a name="l00333"></a><span class="lineno"> 333</span> <span class="comment"> */</span></div> <div class="line"><a name="l00334"></a><span class="lineno"> 334</span>  <span class="keyword">static</span> std::vector<float></div> <div class="line"><a name="l00335"></a><span class="lineno"> 335</span>  root_raised_cosine(<span class="keywordtype">double</span> gain,</div> <div class="line"><a name="l00336"></a><span class="lineno"> 336</span>  <span class="keywordtype">double</span> sampling_freq,</div> <div class="line"><a name="l00337"></a><span class="lineno"> 337</span>  <span class="keywordtype">double</span> symbol_rate, <span class="comment">// Symbol rate, NOT bitrate (unless BPSK)</span></div> <div class="line"><a name="l00338"></a><span class="lineno"> 338</span>  <span class="keywordtype">double</span> alpha, <span class="comment">// Excess Bandwidth Factor</span></div> <div class="line"><a name="l00339"></a><span class="lineno"> 339</span>  <span class="keywordtype">int</span> ntaps);</div> <div class="line"><a name="l00340"></a><span class="lineno"> 340</span>  <span class="comment"></span></div> <div class="line"><a name="l00341"></a><span class="lineno"> 341</span> <span class="comment"> /*!</span></div> <div class="line"><a name="l00342"></a><span class="lineno"> 342</span> <span class="comment"> * \brief design a Gaussian filter</span></div> <div class="line"><a name="l00343"></a><span class="lineno"> 343</span> <span class="comment"> *</span></div> <div class="line"><a name="l00344"></a><span class="lineno"> 344</span> <span class="comment"> * \p gain: overall gain of filter (typically 1.0)</span></div> <div class="line"><a name="l00345"></a><span class="lineno"> 345</span> <span class="comment"> * \p symbols per bit: symbol rate, must be a factor of sample rate</span></div> <div class="line"><a name="l00346"></a><span class="lineno"> 346</span> <span class="comment"> * \p ntaps: number of taps</span></div> <div class="line"><a name="l00347"></a><span class="lineno"> 347</span> <span class="comment"> */</span></div> <div class="line"><a name="l00348"></a><span class="lineno"> 348</span>  <span class="keyword">static</span> std::vector<float></div> <div class="line"><a name="l00349"></a><span class="lineno"> 349</span>  gaussian(<span class="keywordtype">double</span> gain,</div> <div class="line"><a name="l00350"></a><span class="lineno"> 350</span>  <span class="keywordtype">double</span> spb,</div> <div class="line"><a name="l00351"></a><span class="lineno"> 351</span>  <span class="keywordtype">double</span> bt, <span class="comment">// Bandwidth to bitrate ratio</span></div> <div class="line"><a name="l00352"></a><span class="lineno"> 352</span>  <span class="keywordtype">int</span> ntaps);</div> <div class="line"><a name="l00353"></a><span class="lineno"> 353</span>  </div> <div class="line"><a name="l00354"></a><span class="lineno"> 354</span>  <span class="comment">// window functions ...</span></div> <div class="line"><a name="l00355"></a><span class="lineno"> 355</span>  <span class="keyword">static</span> std::vector<float> window (win_type type, <span class="keywordtype">int</span> ntaps, <span class="keywordtype">double</span> beta);</div> <div class="line"><a name="l00356"></a><span class="lineno"> 356</span>  </div> <div class="line"><a name="l00357"></a><span class="lineno"> 357</span>  <span class="keyword">private</span>:</div> <div class="line"><a name="l00358"></a><span class="lineno"> 358</span>  <span class="keyword">static</span> <span class="keywordtype">double</span> bessi0(<span class="keywordtype">double</span> x);</div> <div class="line"><a name="l00359"></a><span class="lineno"> 359</span>  <span class="keyword">static</span> <span class="keywordtype">void</span> sanity_check_1f(<span class="keywordtype">double</span> sampling_freq, <span class="keywordtype">double</span> f1,</div> <div class="line"><a name="l00360"></a><span class="lineno"> 360</span>  <span class="keywordtype">double</span> transition_width);</div> <div class="line"><a name="l00361"></a><span class="lineno"> 361</span>  <span class="keyword">static</span> <span class="keywordtype">void</span> sanity_check_2f(<span class="keywordtype">double</span> sampling_freq, <span class="keywordtype">double</span> f1, <span class="keywordtype">double</span> f2,</div> <div class="line"><a name="l00362"></a><span class="lineno"> 362</span>  <span class="keywordtype">double</span> transition_width);</div> <div class="line"><a name="l00363"></a><span class="lineno"> 363</span>  <span class="keyword">static</span> <span class="keywordtype">void</span> sanity_check_2f_c(<span class="keywordtype">double</span> sampling_freq, <span class="keywordtype">double</span> f1, <span class="keywordtype">double</span> f2,</div> <div class="line"><a name="l00364"></a><span class="lineno"> 364</span>  <span class="keywordtype">double</span> transition_width);</div> <div class="line"><a name="l00365"></a><span class="lineno"> 365</span>  </div> <div class="line"><a name="l00366"></a><span class="lineno"> 366</span>  <span class="keyword">static</span> <span class="keywordtype">int</span> compute_ntaps(<span class="keywordtype">double</span> sampling_freq,</div> <div class="line"><a name="l00367"></a><span class="lineno"> 367</span>  <span class="keywordtype">double</span> transition_width,</div> <div class="line"><a name="l00368"></a><span class="lineno"> 368</span>  win_type window_type, <span class="keywordtype">double</span> beta);</div> <div class="line"><a name="l00369"></a><span class="lineno"> 369</span>  </div> <div class="line"><a name="l00370"></a><span class="lineno"> 370</span>  <span class="keyword">static</span> <span class="keywordtype">int</span> compute_ntaps_windes(<span class="keywordtype">double</span> sampling_freq,</div> <div class="line"><a name="l00371"></a><span class="lineno"> 371</span>  <span class="keywordtype">double</span> transition_width,</div> <div class="line"><a name="l00372"></a><span class="lineno"> 372</span>  <span class="keywordtype">double</span> attenuation_dB);</div> <div class="line"><a name="l00373"></a><span class="lineno"> 373</span>  };</div> <div class="line"><a name="l00374"></a><span class="lineno"> 374</span>  </div> <div class="line"><a name="l00375"></a><span class="lineno"> 375</span>  } <span class="comment">/* namespace filter */</span></div> <div class="line"><a name="l00376"></a><span class="lineno"> 376</span> } <span class="comment">/* namespace gr */</span></div> <div class="line"><a name="l00377"></a><span class="lineno"> 377</span> </div> <div class="line"><a name="l00378"></a><span class="lineno"> 378</span> <span class="preprocessor">#endif </span><span class="comment">/* _FILTER_FIRDES_H_ */</span><span class="preprocessor"></span></div> </div><!-- fragment --></div><!-- contents --> </div><!-- doc-content --> <!-- start footer part --> <div id="nav-path" class="navpath"><!-- id is needed for treeview function! --> <ul> <li class="navelem"><a class="el" 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