--- /dev/null
+<?xml version="1.0"?>
+<!--
+###################################################
+##Logical Not Block
+###################################################
+ -->
+<block>
+ <name>Not</name>
+ <key>gr_not_xx</key>
+ <import>from gnuradio import gr</import>
+ <make>gr.not_$(type.fcn)()</make>
+ <param>
+ <name>IO Type</name>
+ <key>type</key>
+ <type>enum</type>
+ <option>
+ <name>Int</name>
+ <key>int</key>
+ <opt>fcn:ii</opt>
+ </option>
+ <option>
+ <name>Short</name>
+ <key>short</key>
+ <opt>fcn:ss</opt>
+ </option>
+ <option>
+ <name>Byte</name>
+ <key>byte</key>
+ <opt>fcn:bb</opt>
+ </option>
+ </param>
+ <param>
+ <name>Num Inputs</name>
+ <key>num_inputs</key>
+ <value>2</value>
+ <type>int</type>
+ </param>
+ <check>$num_inputs >= 2</check>
+ <sink>
+ <name>in</name>
+ <type>$type</type>
+ <nports>$num_inputs</nports>
+ </sink>
+ <source>
+ <name>out</name>
+ <type>$type</type>
+ </source>
+</block>