--- /dev/null
+<?xml version="1.0"?>
+<!--
+###################################################
+##Single Pole IIR Filter
+###################################################
+ -->
+<block>
+ <name>Single Pole IIR Filter</name>
+ <key>gr_single_pole_iir_filter_xx</key>
+ <import>from gnuradio import gr</import>
+ <make>gr.single_pole_iir_filter_$(type.fcn)($alpha, $vlen)</make>
+ <callback>set_taps($alpha)</callback>
+ <param>
+ <name>Type</name>
+ <key>type</key>
+ <type>enum</type>
+ <option>
+ <name>Complex</name>
+ <key>complex</key>
+ <opt>fcn:cc</opt>
+ </option>
+ <option>
+ <name>Float</name>
+ <key>float</key>
+ <opt>fcn:ff</opt>
+ </option>
+ </param>
+ <param>
+ <name>Alpha</name>
+ <key>alpha</key>
+ <value>1.0</value>
+ <type>real</type>
+ </param>
+ <param>
+ <name>Vec Length</name>
+ <key>vlen</key>
+ <value>1</value>
+ <type>int</type>
+ </param>
+ <check>$vlen > 0</check>
+ <sink>
+ <name>in</name>
+ <type>$type</type>
+ <vlen>$vlen</vlen>
+ </sink>
+ <source>
+ <name>out</name>
+ <type>$type</type>
+ <vlen>$vlen</vlen>
+ </source>
+</block>