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<?xml version='1.0' encoding='ASCII'?><flow_graph><timestamp>Sat Feb 21 13:28:42 2009</timestamp><block><key>options</key><param><key>id</key><value>frequency_response</value></param><param><key>_enabled</key><value>True</value></param><param><key>title</key><value>untitled</value></param><param><key>author</key><value>unknown</value></param><param><key>description</key><value>gnuradio flow graph</value></param><param><key>window_size</key><value>1280, 1024</value></param><param><key>generate_options</key><value>wx_gui</value></param><param><key>category</key><value>Custom</value></param><param><key>realtime_scheduling</key><value>1</value></param><param><key>_coordinate</key><value>(10, 10)</value></param><param><key>_rotation</key><value>0</value></param></block><block><key>audio_source</key><param><key>id</key><value>audio_source_0</value></param><param><key>_enabled</key><value>True</value></param><param><key>samp_rate</key><value>48000</value></param><param><key>device_name</key><value>hw:1,0</value></param><param><key>ok_to_block</key><value>True</value></param><param><key>num_outputs</key><value>1</value></param><param><key>_coordinate</key><value>(452, 510)</value></param><param><key>_rotation</key><value>0</value></param></block><block><key>variable</key><param><key>id</key><value>samp_rate</value></param><param><key>_enabled</key><value>True</value></param><param><key>value</key><value>32000</value></param><param><key>_coordinate</key><value>(10, 170)</value></param><param><key>_rotation</key><value>0</value></param></block><block><key>wxgui_fftsink2</key><param><key>id</key><value>wxgui_fftsink2_0</value></param><param><key>_enabled</key><value>True</value></param><param><key>type</key><value>float</value></param><param><key>title</key><value>FFT Plot</value></param><param><key>samp_rate</key><value>96000</value></param><param><key>baseband_freq</key><value>0</value></param><param><key>y_per_div</key><value>10</value></param><param><key>y_divs</key><value>8</value></param><param><key>ref_level</key><value>50</value></param><param><key>fft_size</key><value>2048</value></param><param><key>fft_rate</key><value>25</value></param><param><key>avg_alpha</key><value>0</value></param><param><key>average</key><value>True</value></param><param><key>peak_hold</key><value>False</value></param><param><key>grid_pos</key><value></value></param><param><key>_coordinate</key><value>(807, 446)</value></param><param><key>_rotation</key><value>0</value></param></block><block><key>gr_noise_source_x</key><param><key>id</key><value>gr_noise_source_x_0</value></param><param><key>_enabled</key><value>True</value></param><param><key>type</key><value>float</value></param><param><key>noise_type</key><value>gr.GR_UNIFORM</value></param><param><key>amp</key><value>1</value></param><param><key>seed</key><value>100</value></param><param><key>_coordinate</key><value>(371, 291)</value></param><param><key>_rotation</key><value>0</value></param></block><block><key>audio_sink</key><param><key>id</key><value>audio_sink_0</value></param><param><key>_enabled</key><value>True</value></param><param><key>samp_rate</key><value>48000</value></param><param><key>device_name</key><value>hw:1,0</value></param><param><key>ok_to_block</key><value>True</value></param><param><key>num_inputs</key><value>2</value></param><param><key>_coordinate</key><value>(635, 295)</value></param><param><key>_rotation</key><value>0</value></param></block><connection><source_block_id>gr_noise_source_x_0</source_block_id><sink_block_id>audio_sink_0</sink_block_id><source_key>0</source_key><sink_key>0</sink_key></connection><connection><source_block_id>audio_source_0</source_block_id><sink_block_id>wxgui_fftsink2_0</sink_block_id><source_key>0</source_key><sink_key>0</sink_key></connection><connection><source_block_id>gr_noise_source_x_0</source_block_id><sink_block_id>audio_sink_0</sink_block_id><source_key>0</source_key><sink_key>1</sink_key></connection></flow_graph>