16 files changed, 599 insertions, 8 deletions
diff --git a/gr-digital/grc/CMakeLists.txt b/gr-digital/grc/CMakeLists.txt
index bace20847..9888247ca 100644
--- a/gr-digital/grc/CMakeLists.txt
+++ b/gr-digital/grc/CMakeLists.txt
@@ -18,4 +18,6 @@
 # Boston, MA 02110-1301, USA.
 
 file(GLOB xml_files "*.xml")
-install(FILES ${xml_files} DESTINATION ${GRC_BLOCKS_DIR} COMPONENT "digital_python")
+install(FILES ${xml_files}
+    DESTINATION ${GRC_BLOCKS_DIR} COMPONENT "digital_python"
+)
diff --git a/gr-digital/grc/digital_block_tree.xml b/gr-digital/grc/digital_block_tree.xml
index 04c679d35..762ac6653 100644
--- a/gr-digital/grc/digital_block_tree.xml
+++ b/gr-digital/grc/digital_block_tree.xml
@@ -1,7 +1,6 @@
 <?xml version="1.0"?>
-
 <!--
- Copyright 2011 Free Software Foundation, Inc.
+ Copyright 2011,2012 Free Software Foundation, Inc.
  
  This file is part of GNU Radio
  
@@ -31,8 +30,35 @@
 	<cat>
                 <name>Coding</name>
 		<block>digital_additive_scrambler_bb</block>
-		<block>digital_descrambler_bb</block>
 		<block>digital_scrambler_bb</block>
+		<block>digital_descrambler_bb</block>
+		<block>digital_binary_slicer_fb</block>
+		<block>digital_bytes_to_syms</block>
+		<block>digital_chunks_to_symbols_xx</block>
+		<block>digital_clock_recovery_mm_xx</block>
+		<block>digital_cma_equalizer_cc</block>
+		<block>digital_constellation_decoder_cb</block>
+		<block>digital_constellation_receiver_cb</block>
+		<block>digital_correlate_access_code_bb</block>
+		<block>digital_costas_loop_cc</block>
+		<block>digital_crc32_bb</block>
+		<block>digital_descrambler_bb</block>
+		<block>digital_fll_band_edge_cc</block>
+		<block>digital_glfsr_source_x</block>
+		<block>digital_header_payload_demux</block>
+		<block>digital_kurtotic_equalizer_cc</block>
+		<block>digital_lms_dd_equalizer_cc</block>
+		<block>digital_map_bb</block>
+		<block>digital_mpsk_receiver_cc</block>
+		<block>digital_mpsk_snr_est_cc</block>
+		<block>digital_packet_headergenerator_bb</block>
+		<block>digital_packet_headergenerator_bb_default</block>
+		<block>digital_packet_headerparser_b</block>
+		<block>digital_packet_headerparser_b_default</block>
+		<block>digital_pfb_clock_sync_xxx</block>
+		<block>digital_pn_correlator_cc</block>
+		<block>digital_probe_density_b</block>
+		<block>digital_probe_mpsk_snr_est_c</block>
 	</cat>
 	<cat>
                 <name>Converters</name>
@@ -92,14 +118,20 @@
 		<block>digital_gmsk_demod</block>
 	</cat>
 	<cat>
-                <name>OFDM</name>
+      <name>OFDM</name>
 		<block>digital_ofdm_mod</block>
+		<block>digital_ofdm_mod2</block>
 		<block>digital_ofdm_demod</block>
+		<block>digital_ofdm_carrier_allocator_cvc</block>
+		<block>digital_ofdm_chanest_vcvc</block>
 		<block>digital_ofdm_cyclic_prefixer</block>
 		<block>digital_ofdm_frame_acquisition</block>
 		<block>digital_ofdm_frame_sink</block>
+		<block>digital_ofdm_frame_equalizer_vcvc</block>
 		<block>digital_ofdm_insert_preamble</block>
 		<block>digital_ofdm_sampler</block>
+                <block>digital_ofdm_serializer_vcc</block>
 		<block>digital_ofdm_sync_pn</block>
+		<block>digital_ofdm_sync_sc_cfb</block>
 	</cat>
 </cat>
diff --git a/gr-digital/grc/digital_crc32_bb.xml b/gr-digital/grc/digital_crc32_bb.xml
new file mode 100644
index 000000000..d60f08f81
--- /dev/null
+++ b/gr-digital/grc/digital_crc32_bb.xml
@@ -0,0 +1,33 @@
+<block>
+  <name>Stream CRC32</name>
+  <key>digital_crc32_bb</key>
+  <import>from gnuradio import digital</import>
+  <make>digital.crc32_bb($check, $lengthtagname)</make>
+  <param>
+	  <name>Mode</name>
+	  <key>check</key>
+	  <type>enum</type>
+	  <option>
+		  <name>Generate CRC</name>
+		  <key>False</key>
+	  </option>
+	  <option>
+		  <name>Check CRC</name>
+		  <key>True</key>
+	  </option>
+  </param>
+  <param>
+    <name>Length tag name</name>
+    <key>lengthtagname</key>
+    <value>"packet_len"</value>
+    <type>string</type>
+  </param>
+  <sink>
+    <name>in</name>
+    <type>byte</type>
+  </sink>
+  <source>
+    <name>out</name>
+    <type>byte</type>
+  </source>
+</block>
diff --git a/gr-digital/grc/digital_header_payload_demux.xml b/gr-digital/grc/digital_header_payload_demux.xml
new file mode 100644
index 000000000..b29d86435
--- /dev/null
+++ b/gr-digital/grc/digital_header_payload_demux.xml
@@ -0,0 +1,94 @@
+<block>
+  <name>Header payload demux</name>
+  <key>digital_header_payload_demux</key>
+  <import>from gnuradio import digital</import>
+  <make>digital.header_payload_demux($header_len, $items_per_symbol, $guard_interval, $length_tag_key, $trigger_tag_key, $output_symbols, $(type.itemsize))</make>
+  <param>
+    <name>Header Length (Symbols)</name>
+    <key>header_len</key>
+    <type>int</type>
+  </param>
+  <param>
+    <name>Items per symbol</name>
+    <key>items_per_symbol</key>
+    <type>int</type>
+  </param>
+  <param>
+    <name>Guard Interval (items)</name>
+    <key>guard_interval</key>
+    <value>0</value>
+    <type>int</type>
+  </param>
+  <param>
+    <name>Length tag key</name>
+    <key>length_tag_key</key>
+    <value>"frame_len"</value>
+    <type>string</type>
+  </param>
+  <param>
+    <name>Trigger tag key</name>
+    <key>trigger_tag_key</key>
+    <value>""</value>
+    <type>string</type>
+  </param>
+  <param>
+    <name>Output Format</name>
+    <key>output_symbols</key>
+    <type>enum</type>
+    <option>
+      <name>Items</name>
+      <key>False</key>
+    </option>
+    <option>
+      <name>Symbols</name>
+      <key>True</key>
+    </option>
+  </param>
+  <param>
+    <name>IO Type</name>
+    <key>type</key>
+    <type>enum</type>
+    <option>
+      <name>Complex</name>
+      <key>complex</key>
+      <opt>itemsize:gr.sizeof_gr_complex</opt>
+    </option>
+    <option>
+      <name>Float</name>
+      <key>float</key>
+      <opt>itemsize:gr.sizeof_float</opt>
+    </option>
+    <option>
+      <name>Int</name>
+      <key>int</key>
+      <opt>itemsize:gr.sizeof_int</opt>
+    </option>
+    <option>
+      <name>Short</name>
+      <key>short</key>
+      <opt>itemsize:gr.sizeof_short</opt>
+    </option>
+  </param>
+  <sink>
+    <name>in</name>
+    <type>$type</type>
+  </sink>
+  <sink>
+    <name>trigger</name>
+    <type>byte</type>
+  </sink>
+  <sink>
+    <name>header_data</name>
+    <type>message</type>
+  </sink>
+  <source>
+    <name>out_hdr</name>
+    <type>$type</type>
+    <vlen>{True: $items_per_symbol, False: 1}[$output_symbols]</vlen>
+  </source>
+  <source>
+    <name>out_payload</name>
+    <type>$type</type>
+    <vlen>{True: $items_per_symbol, False: 1}[$output_symbols]</vlen>
+  </source>
+</block>
diff --git a/gr-digital/grc/digital_ofdm_carrier_allocator_cvc.xml b/gr-digital/grc/digital_ofdm_carrier_allocator_cvc.xml
new file mode 100644
index 000000000..826778ff3
--- /dev/null
+++ b/gr-digital/grc/digital_ofdm_carrier_allocator_cvc.xml
@@ -0,0 +1,45 @@
+<?xml version="1.0"?>
+<block>
+  <name>OFDM Carrier Allocator</name>
+  <key>digital_ofdm_carrier_allocator_cvc</key>
+  <import>from gnuradio import digital</import>
+  <make>digital.ofdm_carrier_allocator_cvc($fft_len, $occupied_carriers, $pilot_carriers, $pilot_symbols, $len_tag_key)</make>
+  <param>
+    <name>FFT length</name>
+    <key>fft_len</key>
+    <value>fft_len</value>
+    <type>int</type>
+  </param>
+  <param>
+    <name>Occupied Carriers</name>
+    <key>occupied_carriers</key>
+    <type>raw</type>
+  </param>
+  <param>
+    <name>Pilot Carriers</name>
+    <key>pilot_carriers</key>
+    <value>()</value>
+    <type>raw</type>
+  </param>
+  <param>
+    <name>Pilot Symbols</name>
+    <key>pilot_symbols</key>
+    <value>()</value>
+    <type>raw</type>
+  </param>
+  <param>
+    <name>Length tag key</name>
+    <key>len_tag_key</key>
+    <value>"packet_len"</value>
+    <type>string</type>
+  </param>
+  <sink>
+    <name>in</name>
+    <type>complex</type>
+  </sink>
+  <source>
+    <name>out</name>
+    <type>complex</type>
+    <vlen>$fft_len</vlen>
+  </source>
+</block>
diff --git a/gr-digital/grc/digital_ofdm_chanest_vcvc.xml b/gr-digital/grc/digital_ofdm_chanest_vcvc.xml
new file mode 100644
index 000000000..e8b1571eb
--- /dev/null
+++ b/gr-digital/grc/digital_ofdm_chanest_vcvc.xml
@@ -0,0 +1,61 @@
+<?xml version="1.0"?>
+<block>
+	<name>OFDM channel &amp; coarse frequency offset estimation</name>
+	<key>digital_ofdm_chanest_vcvc</key>
+	<import>from gnuradio import digital</import>
+	<make>digital.ofdm_chanest_vcvc($sync_symbol1, $sync_symbol2, $n_data_symbols, $eq_noise_red_len, $max_carr_offset, $force_one_symbol)</make>
+	<param>
+		<name>Synchronisation preamble symbol 1</name>
+		<key>sync_symbol1</key>
+		<type>complex_vector</type>
+	</param>
+	<param>
+		<name>Synchronisation preamble symbol 2</name>
+		<key>sync_symbol2</key>
+		<value>()</value>
+		<type>complex_vector</type>
+	</param>
+	<param>
+		<name>Number of data symbols</name>
+		<key>n_data_symbols</key>
+		<value>1</value>
+		<type>int</type>
+	</param>
+	<param>
+		<name>Channel taps noise reduction length</name>
+		<key>eq_noise_red_len</key>
+		<value>0</value>
+		<type>int</type>
+	</param>
+	<param>
+		<name>Maximum carrier offset</name>
+		<key>max_carr_offset</key>
+		<value>-1</value>
+		<type>int</type>
+	</param>
+	<param>
+		<name>Force One Synchronisation Symbol</name>
+		<key>force_one_symbol</key>
+		<type>enum</type>
+		<option>
+			<name>No</name>
+			<key>False</key>
+		</option>
+		<option>
+			<name>Yes</name>
+			<key>True</key>
+		</option>
+	</param>
+	<check>len($sync_symbol1)</check>
+	<check>len($sync_symbol2) == 0 or len($sync_symbol2) == len($sync_symbol1)</check>
+	<sink>
+		<name>in</name>
+		<type>complex</type>
+		<vlen>len($sync_symbol1)</vlen>
+	</sink>
+	<source>
+		<name>out</name>
+		<type>complex</type>
+		<vlen>len($sync_symbol1)</vlen>
+	</source>
+</block>
diff --git a/gr-digital/grc/digital_ofdm_cyclic_prefixer.xml b/gr-digital/grc/digital_ofdm_cyclic_prefixer.xml
index d5e5d3894..80bf339cb 100644
--- a/gr-digital/grc/digital_ofdm_cyclic_prefixer.xml
+++ b/gr-digital/grc/digital_ofdm_cyclic_prefixer.xml
@@ -29,17 +29,31 @@
 	<name>OFDM Cyclic Prefixer</name>
 	<key>digital_ofdm_cyclic_prefixer</key>
 	<import>from gnuradio import digital</import>
-	<make>digital.ofdm_cyclic_prefixer($input_size, $output_size)</make>
+	<make>digital.ofdm_cyclic_prefixer($input_size, $output_size, $rolloff, $tagname)</make>
 	<param>
-		<name>Input Size</name>
+		<name>FFT Length</name>
 		<key>input_size</key>
+		<value>fft_len</value>
 		<type>int</type>
 	</param>
 	<param>
-		<name>Output Size</name>
+		<name>Output Size (FFT length + CP length)</name>
 		<key>output_size</key>
+		<value>fft_len+fft_len/4</value>
 		<type>int</type>
 	</param>
+	<param>
+		<name>Rolloff</name>
+		<key>rolloff</key>
+		<value>0</value>
+		<type>int</type>
+	</param>
+	<param>
+		<name>Length Tag Key</name>
+		<key>tagname</key>
+		<value>"frame_len"</value>
+		<type>string</type>
+	</param>
 	<sink>
 		<name>in</name>
 		<type>complex</type>
diff --git a/gr-digital/grc/digital_ofdm_frame_equalizer_vcvc.xml b/gr-digital/grc/digital_ofdm_frame_equalizer_vcvc.xml
new file mode 100644
index 000000000..330b29a2f
--- /dev/null
+++ b/gr-digital/grc/digital_ofdm_frame_equalizer_vcvc.xml
@@ -0,0 +1,45 @@
+<block>
+  <name>OFDM Frame Equalizer</name>
+  <key>digital_ofdm_frame_equalizer_vcvc</key>
+  <import>from gnuradio import digital</import>
+  <make>digital.ofdm_frame_equalizer_vcvc($equalizer, $len_tag_key, $propagate_channel_state)</make>
+  <param>
+    <name>FFT length</name>
+    <key>fft_len</key>
+    <value>fft_len</value>
+    <type>int</type>
+  </param>
+  <param>
+    <name>Equalizer</name>
+    <key>equalizer</key>
+    <type>raw</type>
+  </param>
+  <param>
+    <name>Length Tag Key</name>
+    <key>len_tag_key</key>
+    <type>string</type>
+  </param>
+  <param>
+	  <name>Propagate Channel State</name>
+	  <key>propagate_channel_state</key>
+	  <type>enum</type>
+	  <option>
+		  <name>Yes</name>
+		  <key>True</key>
+	  </option>
+	  <option>
+		  <name>No</name>
+		  <key>False</key>
+	  </option>
+  </param>
+  <sink>
+    <name>in</name>
+    <type>complex</type>
+    <vlen>$fft_len</vlen>
+  </sink>
+  <source>
+    <name>out</name>
+    <type>complex</type>
+    <vlen>$fft_len</vlen>
+  </source>
+</block>
diff --git a/gr-digital/grc/digital_ofdm_mod2.xml b/gr-digital/grc/digital_ofdm_mod2.xml
new file mode 100644
index 000000000..7de9ff786
--- /dev/null
+++ b/gr-digital/grc/digital_ofdm_mod2.xml
@@ -0,0 +1,65 @@
+<block>
+  <name>OFDM Mod 2</name>
+  <key>digital_ofdm_mod2</key>
+  <category>OFDM</category>
+  <import>from gnuradio import digital</import>
+  <make>digital.ofdm_mod2(fft_len=$fft_len,
+            cp_len=$cp_len,
+            length_tag_name=$length_tag_name,
+            occupied_carriers=$occupied_carriers,
+            pilot_carriers=$pilot_carriers,
+            pilot_symbols=$pilot_symbols,
+            sync_sequence=$sync_sequence,
+            )
+  </make>
+  <param>
+	<name>Cyclic Prefix Length</name>
+	<key>cp_len</key>
+	<value>16</value>
+	<type>int</type>
+  </param>
+  <param>
+    <name>FFT Length</name>
+    <key>fft_len</key>
+    <value>64</value>
+    <type>int</type>
+  </param>
+  <param>
+    <name>Length Tag Name</name>
+    <key>length_tag_name</key>
+    <value>length</value>
+    <type>string</type>
+  </param>
+  <param>
+	<name>Occupied Carriers</name>
+	<key>occupied_carriers</key>
+	<value>(range(1, 27) + range(38, 64),)</value>
+	<type>raw</type>
+  </param>
+  <param>
+	<name>Pilot Carriers</name>
+	<key>pilot_carriers</key>
+	<value>((0,),)</value>
+	<type>raw</type>
+  </param>
+  <param>
+	<name>Pilot Symbols</name>
+	<key>pilot_symbols</key>
+	<value>((100,),)</value>
+	<type>raw</type>
+  </param>
+  <param>
+    <name>Synchronization Sequence</name>
+    <key>sync_sequence</key>
+    <value>None</value>
+    <type>raw</type>
+  </param>
+  <sink>
+    <name>in</name>
+    <type>byte</type>
+  </sink>
+  <source>
+    <name>out</name>
+    <type>complex</type>
+  </source>
+</block>
diff --git a/gr-digital/grc/digital_ofdm_serializer_vcc.xml b/gr-digital/grc/digital_ofdm_serializer_vcc.xml
new file mode 100644
index 000000000..c7596bbb0
--- /dev/null
+++ b/gr-digital/grc/digital_ofdm_serializer_vcc.xml
@@ -0,0 +1,50 @@
+<?xml version="1.0"?>
+<block>
+  <name>OFDM Serializer</name>
+  <key>digital_ofdm_serializer_vcc</key>
+  <import>from gnuradio import digital</import>
+  <make>digital.ofdm_serializer_vcc($fft_len, $occupied_carriers, $len_tag_key, $packet_len_tag_key, $symbols_skipped, $input_is_shifted)</make>
+  <param>
+    <name>FFT length</name>
+    <key>fft_len</key>
+    <value>fft_len</value>
+    <type>int</type>
+  </param>
+  <param>
+    <name>Occupied Carriers</name>
+    <key>occupied_carriers</key>
+    <type>raw</type>
+  </param>
+  <param>
+    <name>Length Tag Key</name>
+    <key>len_tag_key</key>
+    <type>string</type>
+  </param>
+  <param>
+    <name>Packet Length Tag Key</name>
+    <key>packet_len_tag_key</key>
+    <value>""</value>
+    <type>string</type>
+  </param>
+  <param>
+    <name>Symbols skipped</name>
+    <key>symbols_skipped</key>
+    <value>0</value>
+    <type>int</type>
+  </param>
+  <param>
+    <name>Input is shifted</name>
+    <key>input_is_shifted</key>
+    <value>True</value>
+    <type>bool</type>
+  </param>
+  <sink>
+    <name>in</name>
+    <type>complex</type>
+    <vlen>$fft_len</vlen>
+  </sink>
+  <source>
+    <name>out</name>
+    <type>complex</type>
+  </source>
+</block>
diff --git a/gr-digital/grc/digital_ofdm_sync_sc_cfb.xml b/gr-digital/grc/digital_ofdm_sync_sc_cfb.xml
new file mode 100644
index 000000000..7865d248d
--- /dev/null
+++ b/gr-digital/grc/digital_ofdm_sync_sc_cfb.xml
@@ -0,0 +1,29 @@
+<?xml version="1.0"?>
+<block>
+  <name>Schmidl &amp; Cox OFDM synchronisation</name>
+  <key>digital_ofdm_sync_sc_cfb</key>
+  <import>from gnuradio import digital</import>
+  <make>digital.ofdm_sync_sc_cfb($fft_len, $cp_len)</make>
+  <param>
+    <name>FFT length</name>
+    <key>fft_len</key>
+    <type>int</type>
+  </param>
+  <param>
+    <name>Cyclic Prefix length</name>
+    <key>cp_len</key>
+    <type>int</type>
+  </param>
+  <sink>
+    <name>in</name>
+    <type>complex</type>
+  </sink>
+  <source>
+    <name>freq_offset</name>
+    <type>float</type>
+  </source>
+  <source>
+    <name>detect</name>
+    <type>byte</type>
+  </source>
+</block>
diff --git a/gr-digital/grc/digital_packet_headergenerator_bb.xml b/gr-digital/grc/digital_packet_headergenerator_bb.xml
new file mode 100644
index 000000000..a0ec14ae8
--- /dev/null
+++ b/gr-digital/grc/digital_packet_headergenerator_bb.xml
@@ -0,0 +1,19 @@
+<block>
+  <name>Packet Header Generator</name>
+  <key>digital_packet_headergenerator_bb</key>
+  <import>from gnuradio import digital</import>
+  <make>digital.packet_headergenerator_bb($header_formatter)</make>
+  <param>
+    <name>Formatter Object</name>
+    <key>header_formatter</key>
+    <type>raw</type>
+  </param>
+  <sink>
+    <name>in</name>
+    <type>byte</type>
+  </sink>
+  <source>
+    <name>out</name>
+    <type>byte</type>
+  </source>
+</block>
diff --git a/gr-digital/grc/digital_packet_headergenerator_bb_default.xml b/gr-digital/grc/digital_packet_headergenerator_bb_default.xml
new file mode 100644
index 000000000..645b4cd25
--- /dev/null
+++ b/gr-digital/grc/digital_packet_headergenerator_bb_default.xml
@@ -0,0 +1,26 @@
+<block>
+  <name>Packet Header Generator</name>
+  <key>digital_packet_headergenerator_bb_default</key>
+  <import>from gnuradio import digital</import>
+  <make>digital.packet_headergenerator_bb($header_len, $len_tag_key)</make>
+  <param>
+    <name>Header Length</name>
+    <key>header_len</key>
+    <type>int</type>
+  </param>
+  <param>
+    <name>Length Tag Name</name>
+    <key>len_tag_key</key>
+    <value>"packet_len"</value>
+    <type>string</type>
+  </param>
+  <sink>
+    <name>in</name>
+    <type>byte</type>
+  </sink>
+  <source>
+    <name>out</name>
+    <type>byte</type>
+  </source>
+</block>
+
diff --git a/gr-digital/grc/digital_packet_headerparser_b.xml b/gr-digital/grc/digital_packet_headerparser_b.xml
new file mode 100644
index 000000000..bab6bd22e
--- /dev/null
+++ b/gr-digital/grc/digital_packet_headerparser_b.xml
@@ -0,0 +1,19 @@
+<block>
+  <name>Packet Header Parser</name>
+  <key>digital_packet_headerparser_b</key>
+  <import>from gnuradio import digital</import>
+  <make>digital.packet_headerparser_b($header_formatter)</make>
+  <param>
+    <name>Formatter Object</name>
+    <key>header_formatter</key>
+    <type>raw</type>
+  </param>
+  <sink>
+    <name>in</name>
+    <type>byte</type>
+  </sink>
+  <source>
+    <name>header_data</name>
+    <type>message</type>
+  </source>
+</block>
diff --git a/gr-digital/grc/digital_packet_headerparser_b_default.xml b/gr-digital/grc/digital_packet_headerparser_b_default.xml
new file mode 100644
index 000000000..415f4839f
--- /dev/null
+++ b/gr-digital/grc/digital_packet_headerparser_b_default.xml
@@ -0,0 +1,26 @@
+<block>
+  <name>Packet Header Parser (Default)</name>
+  <key>digital_packet_headerparser_b_default</key>
+  <import>from gnuradio import digital</import>
+  <make>digital.packet_headerparser_b($header_len, $len_tag_key)</make>
+  <param>
+    <name>Header Length</name>
+    <key>header_len</key>
+    <type>int</type>
+  </param>
+  <param>
+    <name>Length Tag Name</name>
+    <key>len_tag_key</key>
+    <value>"packet_len"</value>
+    <type>string</type>
+  </param>
+  <sink>
+    <name>in</name>
+    <type>byte</type>
+  </sink>
+  <source>
+    <name>out</name>
+    <type>message</type>
+  </source>
+</block>
+
diff --git a/gr-digital/grc/digital_scale_tags.xml b/gr-digital/grc/digital_scale_tags.xml
new file mode 100644
index 000000000..3e80ee21f
--- /dev/null
+++ b/gr-digital/grc/digital_scale_tags.xml
@@ -0,0 +1,31 @@
+<block>
+  <name>Tag Scaler</name>
+  <key>digital_scale_tags</key>
+  <category>digital</category>
+  <import>from gnuradio import digital</import>
+  <make>digital.scale_tags($item_size, $tag_name, $scale_factor)</make>
+  <param>
+    <name>Item size</name>
+    <key>item_size</key>
+    <type>int</type>
+  </param>
+  <param>
+    <name>Tag Name</name>
+    <key>tag_name</key>
+    <type>string</type>
+  </param>
+  <param>
+    <name>Scale Factor</name>
+    <key>scale_factor</key>
+    <type>real</type>
+  </param>
+  <!--FIXME type should be choosable-->
+  <sink>
+    <name>in</name>
+    <type>byte</type>
+  </sink>
+  <source>
+    <name>out</name>
+    <type>byte</type>
+  </source>
+</block>