<?xml version="1.0"?> <!-- ################################################### ##Probe Density ################################################### --> <block> <name>Probe Density</name> <key>digital_probe_density_b</key> <import>from gnuradio import digital</import> <make>digital.probe_density_b($alpha)</make> <callback>set_alpha($alpha)</callback> <param> <name>Alpha</name> <key>alpha</key> <value>1</value> <type>real</type> </param> <param> <name>Probe Rate</name> <key>probe_rate</key> <value>10</value> <type>real</type> </param> <sink> <name>in</name> <type>byte</type> </sink> </block>