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<a href="gr__pfb__decimator__ccf_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 2009 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> </div>
<div class="line"><a name="l00024"></a><span class="lineno"> 24</span> <span class="preprocessor">#ifndef INCLUDED_GR_PFB_DECIMATOR_CCF_H</span></div>
<div class="line"><a name="l00025"></a><span class="lineno"> 25</span> <span class="preprocessor"></span><span class="preprocessor">#define INCLUDED_GR_PFB_DECIMATOR_CCF_H</span></div>
<div class="line"><a name="l00026"></a><span class="lineno"> 26</span> <span class="preprocessor"></span></div>
<div class="line"><a name="l00027"></a><span class="lineno"> 27</span> <span class="preprocessor">#include <<a class="code" href="gr__core__api_8h.html">gr_core_api.h</a>></span></div>
<div class="line"><a name="l00028"></a><span class="lineno"> 28</span> <span class="preprocessor">#include <<a class="code" href="gr__sync__block_8h.html">gr_sync_block.h</a>></span></div>
<div class="line"><a name="l00029"></a><span class="lineno"> 29</span> </div>
<div class="line"><a name="l00030"></a><span class="lineno"> 30</span> <span class="keyword">class </span><a class="code" href="classgr__pfb__decimator__ccf.html" title="Polyphase filterbank bandpass decimator with gr_complex input, gr_complex output and float taps...">gr_pfb_decimator_ccf</a>;</div>
<div class="line"><a name="l00031"></a><span class="lineno"> 31</span> <span class="keyword">typedef</span> <a class="code" href="classboost_1_1shared__ptr.html" title="shared_ptr documentation stub">boost::shared_ptr<gr_pfb_decimator_ccf></a> <a class="code" href="classboost_1_1shared__ptr.html" title="shared_ptr documentation stub">gr_pfb_decimator_ccf_sptr</a>;</div>
<div class="line"><a name="l00032"></a><span class="lineno"> 32</span> <a class="code" href="gr__core__api_8h.html#a8b8937b0c61edd85ab57ce8203543248">GR_CORE_API</a> <a class="code" href="classboost_1_1shared__ptr.html" title="shared_ptr documentation stub">gr_pfb_decimator_ccf_sptr</a> <a class="code" href="gr__pfb__decimator__ccf_8h.html#ae3866af29cbb4994d5e88f48f11657ea">gr_make_pfb_decimator_ccf</a> (<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> decim,</div>
<div class="line"><a name="l00033"></a><span class="lineno"> 33</span>  <span class="keyword">const</span> std::vector<float> &<a class="code" href="gnuradio-core_2src_2lib_2filter_2interpolator__taps_8h.html#a30bf032e13c2a9fc4a98e14e390cd65a">taps</a>,</div>
<div class="line"><a name="l00034"></a><span class="lineno"> 34</span>  <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> channel=0);</div>
<div class="line"><a name="l00035"></a><span class="lineno"> 35</span> </div>
<div class="line"><a name="l00036"></a><span class="lineno"> 36</span> <span class="keyword">class </span>gr_fir_ccf;</div>
<div class="line"><a name="l00037"></a><span class="lineno"> 37</span> <span class="keyword">class </span><a class="code" href="classgri__fft__complex.html" title="FFT: complex in, complex out.">gri_fft_complex</a>;</div>
<div class="line"><a name="l00038"></a><span class="lineno"> 38</span> <span class="comment"></span></div>
<div class="line"><a name="l00039"></a><span class="lineno"> 39</span> <span class="comment">/*!</span></div>
<div class="line"><a name="l00040"></a><span class="lineno"> 40</span> <span class="comment"> * \class gr_pfb_decimator_ccf</span></div>
<div class="line"><a name="l00041"></a><span class="lineno"> 41</span> <span class="comment"> * \brief Polyphase filterbank bandpass decimator with gr_complex</span></div>
<div class="line"><a name="l00042"></a><span class="lineno"> 42</span> <span class="comment"> * input, gr_complex output and float taps</span></div>
<div class="line"><a name="l00043"></a><span class="lineno"> 43</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00044"></a><span class="lineno"> 44</span> <span class="comment"> * \ingroup filter_blk</span></div>
<div class="line"><a name="l00045"></a><span class="lineno"> 45</span> <span class="comment"> * \ingroup pfb_blk</span></div>
<div class="line"><a name="l00046"></a><span class="lineno"> 46</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00047"></a><span class="lineno"> 47</span> <span class="comment"> * This block takes in a signal stream and performs interger down-</span></div>
<div class="line"><a name="l00048"></a><span class="lineno"> 48</span> <span class="comment"> * sampling (decimation) with a polyphase filterbank. The first input</span></div>
<div class="line"><a name="l00049"></a><span class="lineno"> 49</span> <span class="comment"> * is the integer specifying how much to decimate by. The second</span></div>
<div class="line"><a name="l00050"></a><span class="lineno"> 50</span> <span class="comment"> * input is a vector (Python list) of floating-point taps of the</span></div>
<div class="line"><a name="l00051"></a><span class="lineno"> 51</span> <span class="comment"> * prototype filter. The third input specifies the channel to extract.</span></div>
<div class="line"><a name="l00052"></a><span class="lineno"> 52</span> <span class="comment"> * By default, the zeroth channel is used, which is the baseband</span></div>
<div class="line"><a name="l00053"></a><span class="lineno"> 53</span> <span class="comment"> * channel (first Nyquist zone).</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"> * The <EM>channel</EM> parameter specifies which channel to use since</span></div>
<div class="line"><a name="l00056"></a><span class="lineno"> 56</span> <span class="comment"> * this class is capable of bandpass decimation. Given a complex input</span></div>
<div class="line"><a name="l00057"></a><span class="lineno"> 57</span> <span class="comment"> * stream at a sampling rate of <EM>fs</EM> and a decimation rate of</span></div>
<div class="line"><a name="l00058"></a><span class="lineno"> 58</span> <span class="comment"> * <EM>decim</EM>, the input frequency domain is split into</span></div>
<div class="line"><a name="l00059"></a><span class="lineno"> 59</span> <span class="comment"> * <EM>decim</EM> channels that represent the Nyquist zones. Using the</span></div>
<div class="line"><a name="l00060"></a><span class="lineno"> 60</span> <span class="comment"> * polyphase filterbank, we can select any one of these channels to</span></div>
<div class="line"><a name="l00061"></a><span class="lineno"> 61</span> <span class="comment"> * decimate.</span></div>
<div class="line"><a name="l00062"></a><span class="lineno"> 62</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00063"></a><span class="lineno"> 63</span> <span class="comment"> * The output signal will be the basebanded and decimated signal from</span></div>
<div class="line"><a name="l00064"></a><span class="lineno"> 64</span> <span class="comment"> * that channel. This concept is very similar to the PFB channelizer</span></div>
<div class="line"><a name="l00065"></a><span class="lineno"> 65</span> <span class="comment"> * (see #gr_pfb_channelizer_ccf) where only a single channel is</span></div>
<div class="line"><a name="l00066"></a><span class="lineno"> 66</span> <span class="comment"> * extracted at a time.</span></div>
<div class="line"><a name="l00067"></a><span class="lineno"> 67</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00068"></a><span class="lineno"> 68</span> <span class="comment"> * The filter's taps should be based on the sampling rate before</span></div>
<div class="line"><a name="l00069"></a><span class="lineno"> 69</span> <span class="comment"> * decimation.</span></div>
<div class="line"><a name="l00070"></a><span class="lineno"> 70</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00071"></a><span class="lineno"> 71</span> <span class="comment"> * For example, using the GNU Radio's firdes utility to building</span></div>
<div class="line"><a name="l00072"></a><span class="lineno"> 72</span> <span class="comment"> * filters, we build a low-pass filter with a sampling rate of</span></div>
<div class="line"><a name="l00073"></a><span class="lineno"> 73</span> <span class="comment"> * <EM>fs</EM>, a 3-dB bandwidth of <EM>BW</EM> and a transition</span></div>
<div class="line"><a name="l00074"></a><span class="lineno"> 74</span> <span class="comment"> * bandwidth of <EM>TB</EM>. We can also specify the out-of-band</span></div>
<div class="line"><a name="l00075"></a><span class="lineno"> 75</span> <span class="comment"> * attenuation to use, <EM>ATT</EM>, and the filter window</span></div>
<div class="line"><a name="l00076"></a><span class="lineno"> 76</span> <span class="comment"> * function (a Blackman-harris window in this case). The first input</span></div>
<div class="line"><a name="l00077"></a><span class="lineno"> 77</span> <span class="comment"> * is the gain of the filter, which we specify here as unity.</span></div>
<div class="line"><a name="l00078"></a><span class="lineno"> 78</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00079"></a><span class="lineno"> 79</span> <span class="comment"> * <B><EM>self._taps = gr.firdes.low_pass_2(1, fs, BW, TB,</span></div>
<div class="line"><a name="l00080"></a><span class="lineno"> 80</span> <span class="comment"> * attenuation_dB=ATT, window=gr.firdes.WIN_BLACKMAN_hARRIS)</EM></B></span></div>
<div class="line"><a name="l00081"></a><span class="lineno"> 81</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00082"></a><span class="lineno"> 82</span> <span class="comment"> * The PFB decimator code takes the taps generated above and builds a</span></div>
<div class="line"><a name="l00083"></a><span class="lineno"> 83</span> <span class="comment"> * set of filters. The set contains <EM>decim</EM> number of filters</span></div>
<div class="line"><a name="l00084"></a><span class="lineno"> 84</span> <span class="comment"> * and each filter contains ceil(taps.size()/decim) number of taps.</span></div>
<div class="line"><a name="l00085"></a><span class="lineno"> 85</span> <span class="comment"> * Each tap from the filter prototype is sequentially inserted into</span></div>
<div class="line"><a name="l00086"></a><span class="lineno"> 86</span> <span class="comment"> * the next filter. When all of the input taps are used, the remaining</span></div>
<div class="line"><a name="l00087"></a><span class="lineno"> 87</span> <span class="comment"> * filters in the filterbank are filled out with 0's to make sure each</span></div>
<div class="line"><a name="l00088"></a><span class="lineno"> 88</span> <span class="comment"> * filter has the same number of taps.</span></div>
<div class="line"><a name="l00089"></a><span class="lineno"> 89</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00090"></a><span class="lineno"> 90</span> <span class="comment"> * The theory behind this block can be found in Chapter 6 of</span></div>
<div class="line"><a name="l00091"></a><span class="lineno"> 91</span> <span class="comment"> * the following book.</span></div>
<div class="line"><a name="l00092"></a><span class="lineno"> 92</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00093"></a><span class="lineno"> 93</span> <span class="comment"> * <B><EM>f. harris, "Multirate Signal Processing for Communication</span></div>
<div class="line"><a name="l00094"></a><span class="lineno"> 94</span> <span class="comment"> * Systems," Upper Saddle River, NJ: Prentice Hall, Inc. 2004.</EM></B></span></div>
<div class="line"><a name="l00095"></a><span class="lineno"> 95</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00096"></a><span class="lineno"> 96</span> </div>
<div class="line"><a name="l00097"></a><span class="lineno"><a class="code" href="classgr__pfb__decimator__ccf.html"> 97</a></span> <span class="keyword">class </span><a class="code" href="gr__core__api_8h.html#a8b8937b0c61edd85ab57ce8203543248">GR_CORE_API</a> <a class="code" href="classgr__pfb__decimator__ccf.html" title="Polyphase filterbank bandpass decimator with gr_complex input, gr_complex output and float taps...">gr_pfb_decimator_ccf</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></div>
<div class="line"><a name="l00098"></a><span class="lineno"> 98</span> {</div>
<div class="line"><a name="l00099"></a><span class="lineno"> 99</span>  <span class="keyword">private</span>:<span class="comment"></span></div>
<div class="line"><a name="l00100"></a><span class="lineno"> 100</span> <span class="comment"> /*!</span></div>
<div class="line"><a name="l00101"></a><span class="lineno"> 101</span> <span class="comment"> * Build the polyphase filterbank decimator.</span></div>
<div class="line"><a name="l00102"></a><span class="lineno"> 102</span> <span class="comment"> * \param decim (unsigned integer) Specifies the decimation rate to use</span></div>
<div class="line"><a name="l00103"></a><span class="lineno"> 103</span> <span class="comment"> * \param taps (vector/list of floats) The prototype filter to populate the filterbank.</span></div>
<div class="line"><a name="l00104"></a><span class="lineno"> 104</span> <span class="comment"> * \param channel (unsigned integer) Selects the channel to return [default=0].</span></div>
<div class="line"><a name="l00105"></a><span class="lineno"> 105</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00106"></a><span class="lineno"> 106</span>  <span class="keyword">friend</span> <a class="code" href="gr__core__api_8h.html#a8b8937b0c61edd85ab57ce8203543248">GR_CORE_API</a> <a class="code" href="classboost_1_1shared__ptr.html" title="shared_ptr documentation stub">gr_pfb_decimator_ccf_sptr</a> <a class="code" href="gr__pfb__decimator__ccf_8h.html#ae3866af29cbb4994d5e88f48f11657ea">gr_make_pfb_decimator_ccf</a> (<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> decim,</div>
<div class="line"><a name="l00107"></a><span class="lineno"> 107</span>  <span class="keyword">const</span> std::vector<float> &<a class="code" href="gnuradio-core_2src_2lib_2filter_2interpolator__taps_8h.html#a30bf032e13c2a9fc4a98e14e390cd65a">taps</a>,</div>
<div class="line"><a name="l00108"></a><span class="lineno"> 108</span>  <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> channel);</div>
<div class="line"><a name="l00109"></a><span class="lineno"> 109</span> </div>
<div class="line"><a name="l00110"></a><span class="lineno"> 110</span>  std::vector<gr_fir_ccf*> d_filters;</div>
<div class="line"><a name="l00111"></a><span class="lineno"> 111</span>  std::vector< std::vector<float> > d_taps;</div>
<div class="line"><a name="l00112"></a><span class="lineno"> 112</span>  <a class="code" href="classgri__fft__complex.html" title="FFT: complex in, complex out.">gri_fft_complex</a> *d_fft;</div>
<div class="line"><a name="l00113"></a><span class="lineno"> 113</span>  <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> d_rate;</div>
<div class="line"><a name="l00114"></a><span class="lineno"> 114</span>  <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> d_chan;</div>
<div class="line"><a name="l00115"></a><span class="lineno"> 115</span>  <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> d_taps_per_filter;</div>
<div class="line"><a name="l00116"></a><span class="lineno"> 116</span>  <span class="keywordtype">bool</span> d_updated;</div>
<div class="line"><a name="l00117"></a><span class="lineno"> 117</span>  <a class="code" href="gr__complex_8h.html#aec4bfe41433369afae9327f1b0bc9109">gr_complex</a> *d_rotator;</div>
<div class="line"><a name="l00118"></a><span class="lineno"> 118</span> <span class="comment"></span></div>
<div class="line"><a name="l00119"></a><span class="lineno"> 119</span> <span class="comment"> /*!</span></div>
<div class="line"><a name="l00120"></a><span class="lineno"> 120</span> <span class="comment"> * Build the polyphase filterbank decimator.</span></div>
<div class="line"><a name="l00121"></a><span class="lineno"> 121</span> <span class="comment"> * \param decim (unsigned integer) Specifies the decimation rate to use</span></div>
<div class="line"><a name="l00122"></a><span class="lineno"> 122</span> <span class="comment"> * \param taps (vector/list of floats) The prototype filter to populate the filterbank.</span></div>
<div class="line"><a name="l00123"></a><span class="lineno"> 123</span> <span class="comment"> * \param channel (unsigned integer) Selects the channel to return [default=0].</span></div>
<div class="line"><a name="l00124"></a><span class="lineno"> 124</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00125"></a><span class="lineno"> 125</span>  <a class="code" href="classgr__pfb__decimator__ccf.html" title="Polyphase filterbank bandpass decimator with gr_complex input, gr_complex output and float taps...">gr_pfb_decimator_ccf</a> (<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> decim,</div>
<div class="line"><a name="l00126"></a><span class="lineno"> 126</span>  <span class="keyword">const</span> std::vector<float> &taps,</div>
<div class="line"><a name="l00127"></a><span class="lineno"> 127</span>  <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> channel);</div>
<div class="line"><a name="l00128"></a><span class="lineno"> 128</span> </div>
<div class="line"><a name="l00129"></a><span class="lineno"> 129</span> <span class="keyword">public</span>:</div>
<div class="line"><a name="l00130"></a><span class="lineno"> 130</span>  ~<a class="code" href="classgr__pfb__decimator__ccf.html" title="Polyphase filterbank bandpass decimator with gr_complex input, gr_complex output and float taps...">gr_pfb_decimator_ccf</a> ();</div>
<div class="line"><a name="l00131"></a><span class="lineno"> 131</span> <span class="comment"></span></div>
<div class="line"><a name="l00132"></a><span class="lineno"> 132</span> <span class="comment"> /*!</span></div>
<div class="line"><a name="l00133"></a><span class="lineno"> 133</span> <span class="comment"> * Resets the filterbank's filter taps with the new prototype filter</span></div>
<div class="line"><a name="l00134"></a><span class="lineno"> 134</span> <span class="comment"> * \param taps (vector/list of floats) The prototype filter to populate the filterbank.</span></div>
<div class="line"><a name="l00135"></a><span class="lineno"> 135</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00136"></a><span class="lineno"> 136</span>  <span class="keywordtype">void</span> set_taps (<span class="keyword">const</span> std::vector<float> &taps);</div>
<div class="line"><a name="l00137"></a><span class="lineno"> 137</span> <span class="comment"></span></div>
<div class="line"><a name="l00138"></a><span class="lineno"> 138</span> <span class="comment"> /*!</span></div>
<div class="line"><a name="l00139"></a><span class="lineno"> 139</span> <span class="comment"> * Print all of the filterbank taps to screen.</span></div>
<div class="line"><a name="l00140"></a><span class="lineno"> 140</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00141"></a><span class="lineno"> 141</span>  <span class="keywordtype">void</span> print_taps();</div>
<div class="line"><a name="l00142"></a><span class="lineno"> 142</span> </div>
<div class="line"><a name="l00143"></a><span class="lineno"> 143</span>  <span class="comment">//void set_channel (unsigned int channel);</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="keywordtype">int</span> <a class="code" href="classgr__sync__block.html#a0c523f4285a6eb690f677ee6295ab117" title="just like gr_block::general_work, only this arranges to call consume_each for you">work</a> (<span class="keywordtype">int</span> noutput_items,</div>
<div class="line"><a name="l00146"></a><span class="lineno"> 146</span>  <a class="code" href="gr__types_8h.html#a9852a3d906d823cb70eb9c29e7f2a43d">gr_vector_const_void_star</a> &input_items,</div>
<div class="line"><a name="l00147"></a><span class="lineno"> 147</span>  <a class="code" href="gr__types_8h.html#acd3f499576e769966ea44554b359d949">gr_vector_void_star</a> &output_items);</div>
<div class="line"><a name="l00148"></a><span class="lineno"> 148</span> };</div>
<div class="line"><a name="l00149"></a><span class="lineno"> 149</span> </div>
<div class="line"><a name="l00150"></a><span class="lineno"> 150</span> <span class="preprocessor">#endif</span></div>
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