FM demod with 16 kHz channel filter + local UDP (port 7355) output.
This commit is contained in:
Mark Jessop
parent
d5a1154535
commit
21b4f7e2de
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@ -1,5 +1,5 @@
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<?xml version='1.0' encoding='utf-8'?>
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<?grc format='1' created='3.7.11'?>
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<?grc format='1' created='3.7.10'?>
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<flow_graph>
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<timestamp>Thu May 5 00:22:45 2016</timestamp>
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<block>
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@ -369,7 +369,7 @@ TX sampling rate</value>
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</param>
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<param>
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<key>_coordinate</key>
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<value>(1085, 410)</value>
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<value>(864, 412)</value>
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</param>
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<param>
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<key>_rotation</key>
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@ -537,6 +537,108 @@ TX sampling rate</value>
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<value>ccc</value>
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</param>
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</block>
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<block>
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<key>blocks_float_to_short</key>
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<param>
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<key>alias</key>
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<value></value>
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</param>
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<param>
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<key>comment</key>
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<value></value>
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</param>
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<param>
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<key>affinity</key>
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<value></value>
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</param>
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<param>
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<key>_enabled</key>
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<value>True</value>
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</param>
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<param>
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<key>_coordinate</key>
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<value>(696, 532)</value>
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</param>
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<param>
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<key>_rotation</key>
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<value>180</value>
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</param>
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<param>
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<key>id</key>
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<value>blocks_float_to_short_0</value>
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</param>
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<param>
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<key>maxoutbuf</key>
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<value>0</value>
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</param>
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<param>
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<key>minoutbuf</key>
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<value>0</value>
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</param>
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<param>
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<key>scale</key>
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<value>32767</value>
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</param>
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<param>
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<key>vlen</key>
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<value>1</value>
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</param>
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</block>
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<block>
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<key>blocks_udp_sink</key>
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<param>
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<key>alias</key>
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<value></value>
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</param>
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<param>
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<key>comment</key>
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<value></value>
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</param>
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<param>
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<key>affinity</key>
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<value></value>
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</param>
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<param>
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<key>ipaddr</key>
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<value>127.0.0.1</value>
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</param>
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<param>
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<key>port</key>
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<value>7355</value>
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</param>
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<param>
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<key>_enabled</key>
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<value>True</value>
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</param>
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<param>
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<key>_coordinate</key>
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<value>(384, 512)</value>
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</param>
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<param>
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<key>_rotation</key>
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<value>180</value>
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</param>
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<param>
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<key>id</key>
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<value>blocks_udp_sink_0</value>
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</param>
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<param>
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<key>type</key>
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<value>short</value>
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</param>
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<param>
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<key>psize</key>
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<value>1472</value>
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</param>
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<param>
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<key>eof</key>
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<value>False</value>
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</param>
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<param>
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<key>vlen</key>
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<value>1</value>
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</param>
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</block>
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<block>
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<key>parameter</key>
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<param>
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@ -941,6 +1043,82 @@ we shift the LO a little further</value>
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<value>100e3</value>
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</param>
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</block>
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<block>
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<key>low_pass_filter</key>
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<param>
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<key>beta</key>
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<value>6.76</value>
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</param>
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<param>
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<key>alias</key>
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<value></value>
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</param>
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<param>
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<key>comment</key>
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<value>16 kHz filter width, about right
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for a standard 5 kHz Dev FM signal.</value>
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</param>
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<param>
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<key>affinity</key>
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<value></value>
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</param>
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<param>
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<key>cutoff_freq</key>
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<value>8000</value>
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</param>
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<param>
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<key>decim</key>
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<value>1</value>
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</param>
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<param>
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<key>_enabled</key>
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<value>True</value>
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</param>
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<param>
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<key>type</key>
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<value>fir_filter_ccf</value>
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</param>
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<param>
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<key>_coordinate</key>
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<value>(1064, 368)</value>
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</param>
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<param>
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<key>_rotation</key>
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<value>180</value>
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</param>
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<param>
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<key>gain</key>
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<value>1</value>
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</param>
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<param>
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<key>id</key>
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<value>low_pass_filter_0</value>
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</param>
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<param>
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<key>interp</key>
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<value>1</value>
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</param>
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<param>
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<key>maxoutbuf</key>
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<value>0</value>
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</param>
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<param>
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<key>minoutbuf</key>
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<value>0</value>
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</param>
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<param>
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<key>samp_rate</key>
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<value>audio_samp_rate</value>
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</param>
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<param>
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<key>width</key>
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<value>3000</value>
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</param>
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<param>
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<key>win</key>
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<value>firdes.WIN_HAMMING</value>
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</param>
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</block>
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<block>
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<key>osmosdr_source</key>
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<param>
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@ -2681,7 +2859,7 @@ we shift the LO a little further</value>
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</param>
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<param>
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<key>_coordinate</key>
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<value>(877, 394)</value>
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<value>(432, 396)</value>
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</param>
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<param>
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<key>_rotation</key>
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@ -2857,6 +3035,12 @@ we shift the LO a little further</value>
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<value>/tmp/waterfall.dat</value>
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</param>
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</block>
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<connection>
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<source_block_id>analog_quadrature_demod_cf_0</source_block_id>
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<sink_block_id>blocks_float_to_short_0</sink_block_id>
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<source_key>0</source_key>
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<sink_key>0</sink_key>
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</connection>
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<connection>
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<source_block_id>analog_quadrature_demod_cf_0</source_block_id>
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<sink_block_id>satnogs_ogg_encoder_0</sink_block_id>
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@ -2865,7 +3049,7 @@ we shift the LO a little further</value>
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</connection>
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<connection>
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<source_block_id>blks2_rational_resampler_xxx_1</source_block_id>
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<sink_block_id>analog_quadrature_demod_cf_0</sink_block_id>
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<sink_block_id>low_pass_filter_0</sink_block_id>
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<source_key>0</source_key>
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<sink_key>0</sink_key>
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</connection>
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@ -2881,12 +3065,24 @@ we shift the LO a little further</value>
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<source_key>0</source_key>
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<sink_key>0</sink_key>
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</connection>
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<connection>
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<source_block_id>blocks_float_to_short_0</source_block_id>
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<sink_block_id>blocks_udp_sink_0</sink_block_id>
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<source_key>0</source_key>
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<sink_key>0</sink_key>
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</connection>
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<connection>
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<source_block_id>freq_xlating_fir_filter_xxx_0</source_block_id>
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<sink_block_id>blks2_rational_resampler_xxx_1</sink_block_id>
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<source_key>0</source_key>
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<sink_key>0</sink_key>
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</connection>
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<connection>
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<source_block_id>low_pass_filter_0</source_block_id>
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<sink_block_id>analog_quadrature_demod_cf_0</sink_block_id>
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<source_key>0</source_key>
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<sink_key>0</sink_key>
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</connection>
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<connection>
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<source_block_id>osmosdr_source_0</source_block_id>
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<sink_block_id>satnogs_coarse_doppler_correction_cc_0</sink_block_id>
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@ -5,10 +5,11 @@
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# Title: FM Generic Demodulation
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# Author: Manolis Surligas (surligas@gmail.com)
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# Description: A generic FM demodulation block
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# Generated: Wed Aug 9 13:41:22 2017
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# Generated: Sun Sep 17 05:13:50 2017
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##################################################
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from gnuradio import analog
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from gnuradio import blocks
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from gnuradio import eng_notation
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from gnuradio import filter
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from gnuradio import gr
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@ -51,9 +52,9 @@ class satnogs_fm_demod(gr.top_block):
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##################################################
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self.samp_rate_rx = samp_rate_rx = satnogs.hw_rx_settings[rx_sdr_device]['samp_rate']
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self.xlate_filter_taps = xlate_filter_taps = firdes.low_pass(1, samp_rate_rx, 125000, 25000, firdes.WIN_HAMMING, 6.76)
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self.taps = taps = firdes.low_pass(12.0, samp_rate_rx, 100e3, 60000, firdes.WIN_HAMMING, 6.76)
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self.filter_rate = filter_rate = 250000
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self.deviation = deviation = 5000
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self.audio_samp_rate = audio_samp_rate = 48000
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@ -79,8 +80,12 @@ class satnogs_fm_demod(gr.top_block):
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self.osmosdr_source_0.set_bb_gain(satnogs.handle_rx_bb_gain(rx_sdr_device, bb_gain), 0)
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self.osmosdr_source_0.set_antenna(satnogs.handle_rx_antenna(rx_sdr_device, antenna), 0)
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self.osmosdr_source_0.set_bandwidth(samp_rate_rx, 0)
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self.low_pass_filter_0 = filter.fir_filter_ccf(1, firdes.low_pass(
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1, audio_samp_rate, 8000, 3000, firdes.WIN_HAMMING, 6.76))
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self.freq_xlating_fir_filter_xxx_0 = filter.freq_xlating_fir_filter_ccc(int(samp_rate_rx/filter_rate), (xlate_filter_taps), lo_offset, samp_rate_rx)
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self.blocks_udp_sink_0 = blocks.udp_sink(gr.sizeof_short*1, '127.0.0.1', 7355, 1472, False)
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self.blocks_float_to_short_0 = blocks.float_to_short(1, 32767)
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self.blks2_rational_resampler_xxx_1 = filter.rational_resampler_ccc(
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interpolation=24,
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decimation=125,
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@ -92,14 +97,17 @@ class satnogs_fm_demod(gr.top_block):
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##################################################
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# Connections
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##################################################
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self.msg_connect((self.satnogs_tcp_rigctl_msg_source_0, 'freq'), (self.satnogs_coarse_doppler_correction_cc_0, 'freq'))
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self.connect((self.analog_quadrature_demod_cf_0, 0), (self.satnogs_ogg_encoder_0, 0))
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self.connect((self.blks2_rational_resampler_xxx_1, 0), (self.analog_quadrature_demod_cf_0, 0))
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self.connect((self.blks2_rational_resampler_xxx_1, 0), (self.satnogs_iq_sink_0, 0))
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self.connect((self.blks2_rational_resampler_xxx_1, 0), (self.satnogs_waterfall_sink_0, 0))
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self.connect((self.freq_xlating_fir_filter_xxx_0, 0), (self.blks2_rational_resampler_xxx_1, 0))
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self.connect((self.osmosdr_source_0, 0), (self.satnogs_coarse_doppler_correction_cc_0, 0))
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self.connect((self.satnogs_coarse_doppler_correction_cc_0, 0), (self.freq_xlating_fir_filter_xxx_0, 0))
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self.msg_connect((self.satnogs_tcp_rigctl_msg_source_0, 'freq'), (self.satnogs_coarse_doppler_correction_cc_0, 'freq'))
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self.connect((self.analog_quadrature_demod_cf_0, 0), (self.blocks_float_to_short_0, 0))
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self.connect((self.analog_quadrature_demod_cf_0, 0), (self.satnogs_ogg_encoder_0, 0))
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self.connect((self.blks2_rational_resampler_xxx_1, 0), (self.low_pass_filter_0, 0))
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self.connect((self.blks2_rational_resampler_xxx_1, 0), (self.satnogs_iq_sink_0, 0))
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self.connect((self.blks2_rational_resampler_xxx_1, 0), (self.satnogs_waterfall_sink_0, 0))
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self.connect((self.blocks_float_to_short_0, 0), (self.blocks_udp_sink_0, 0))
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self.connect((self.freq_xlating_fir_filter_xxx_0, 0), (self.blks2_rational_resampler_xxx_1, 0))
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self.connect((self.low_pass_filter_0, 0), (self.analog_quadrature_demod_cf_0, 0))
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self.connect((self.osmosdr_source_0, 0), (self.satnogs_coarse_doppler_correction_cc_0, 0))
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self.connect((self.satnogs_coarse_doppler_correction_cc_0, 0), (self.freq_xlating_fir_filter_xxx_0, 0))
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def get_antenna(self):
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return self.antenna
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@ -252,6 +260,7 @@ class satnogs_fm_demod(gr.top_block):
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def set_audio_samp_rate(self, audio_samp_rate):
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self.audio_samp_rate = audio_samp_rate
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self.low_pass_filter_0.set_taps(firdes.low_pass(1, self.audio_samp_rate, 8000, 3000, firdes.WIN_HAMMING, 6.76))
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self.analog_quadrature_demod_cf_0.set_gain((2*math.pi*self.deviation)/self.audio_samp_rate)
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def get_audio_gain(self):
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