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   1 <?xml version="1.0"?>
   2 <!--
   3 ###################################################
   4 ##Low Pass Filter: Custom wrapper
   5 ###################################################
   6  -->
   7 <block>
   8         <name>Low Pass Filter</name>
   9         <key>low_pass_filter</key>
  10         <import>from gnuradio import gr</import>
  11         <import>from gnuradio.gr import firdes</import>
  12         <make>gr.$(type)(#if str($type).startswith('interp') then $interp else $decim#, firdes.low_pass(
  13         $gain, $samp_rate, $cutoff_freq, $width, firdes.$window, $beta))</make>
  14         <callback>set_taps(firdes.low_pass($gain, $samp_rate, $cutoff_freq, $width, firdes.$window, $beta))</callback>
  15         <param>
  16                 <name>FIR Type</name>
  17                 <key>type</key>
  18                 <type>enum</type>
  19                 <option>
  20                         <name>Complex->Complex (Decimating)</name>
  21                         <key>fir_filter_ccf</key>
  22                         <opt>input:complex</opt>
  23                         <opt>output:complex</opt>
  24                 </option>
  25                 <option>
  26                         <name>Complex->Complex (Interpolating)</name>
  27                         <key>interp_fir_filter_ccf</key>
  28                         <opt>input:complex</opt>
  29                         <opt>output:complex</opt>
  30                 </option>
  31                 <option>
  32                         <name>Float->Float (Decimating)</name>
  33                         <key>fir_filter_fff</key>
  34                         <opt>input:float</opt>
  35                         <opt>output:float</opt>
  36                 </option>
  37                 <option>
  38                         <name>Float->Float (Interpolating)</name>
  39                         <key>interp_fir_filter_fff</key>
  40                         <opt>input:float</opt>
  41                         <opt>output:float</opt>
  42                 </option>
  43         </param>
  44         <param>
  45                 <name>Decimation</name>
  46                 <key>decim</key>
  47                 <value>1</value>
  48                 <type>int</type>
  49                 <hide>#if str($type).startswith('interp') then 'all' else 'none'#</hide>
  50         </param>
  51         <param>
  52                 <name>Interpolation</name>
  53                 <key>interp</key>
  54                 <value>1</value>
  55                 <type>int</type>
  56                 <hide>#if str($type).startswith('interp') then 'none' else 'all'#</hide>
  57         </param>
  58         <param>
  59                 <name>Gain</name>
  60                 <key>gain</key>
  61                 <value>1</value>
  62                 <type>real</type>
  63         </param>
  64         <param>
  65                 <name>Sample Rate</name>
  66                 <key>samp_rate</key>
  67                 <value>samp_rate</value>
  68                 <type>real</type>
  69         </param>
  70         <param>
  71                 <name>Cutoff Freq</name>
  72                 <key>cutoff_freq</key>
  73                 <type>real</type>
  74         </param>
  75         <param>
  76                 <name>Transition Width</name>
  77                 <key>width</key>
  78                 <type>real</type>
  79         </param>
  80         <param>
  81                 <name>Window</name>
  82                 <key>window</key>
  83                 <type>enum</type>
  84                 <option>
  85                         <name>Hamming</name>
  86                         <key>WIN_HAMMING</key>
  87                 </option>
  88                 <option>
  89                         <name>Hann</name>
  90                         <key>WIN_HANN</key>
  91                 </option>
  92                 <option>
  93                         <name>Blackman</name>
  94                         <key>WIN_BLACKMAN</key>
  95                 </option>
  96                 <option>
  97                         <name>Rectangular</name>
  98                         <key>WIN_RECTANGULAR</key>
  99                 </option>
 100                 <option>
 101                         <name>Kaiser</name>
 102                         <key>WIN_KAISER</key>
 103                 </option>
 104         </param>
 105         <param>
 106                 <name>Beta</name>
 107                 <key>beta</key>
 108                 <value>6.76</value>
 109                 <type>real</type>
 110         </param>
 111         <sink>
 112                 <name>in</name>
 113                 <type>$type.input</type>
 114         </sink>
 115         <source>
 116                 <name>out</name>
 117                 <type>$type.output</type>
 118         </source>
 119         <doc>
 120 This filter is a convenience wrapper for an fir filter and a firdes taps generating function.
 121
 122 Sample rate, cutoff frequency, and transition width are in Hertz.
 123
 124 The beta paramater only applies to the Kaiser window.
 125         </doc>
 126 </block>