From d049678e49aefaa823ce45bd9310e2e43c93e1cf Mon Sep 17 00:00:00 2001
From: cswiger <cswiger@221aa14e-8319-0410-a670-987f0aec2ac5>
Date: Mon, 23 Apr 2007 10:45:42 +0000
Subject: Fixed atsc_field_sync_demux to consume input even when not creating
output. Added python files to make a complete 2.x atsc receiver, but it is
not fully working. It will happily produce the exact same amount of transport
stream output as a working system but has errors in the data.
git-svn-id: http://gnuradio.org/svn/gnuradio/trunk@5081 221aa14e-8319-0410-a670-987f0aec2ac5
---
gr-atsc/src/python/interp.py | 74 ++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 74 insertions(+)
create mode 100755 gr-atsc/src/python/interp.py
(limited to 'gr-atsc/src/python/interp.py')
diff --git a/gr-atsc/src/python/interp.py b/gr-atsc/src/python/interp.py
new file mode 100755
index 0000000000..36cc72447b
--- /dev/null
+++ b/gr-atsc/src/python/interp.py
@@ -0,0 +1,74 @@
+#!/usr/bin/env /usr/bin/python
+#
+# Copyright 2004 Free Software Foundation, Inc.
+#
+# This file is part of GNU Radio
+#
+# GNU Radio is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2, or (at your option)
+# any later version.
+#
+# GNU Radio is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with GNU Radio; see the file COPYING. If not, write to
+# the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+# Boston, MA 02111-1307, USA.
+#
+# This module starts the atsc processing chain taking the captured
+# off-air signal created with:
+#
+# usrp_rx_cfile.py -R <side with tuner, a or b>
+# -d 10 set decimation to get signal at 6.4e6 rate
+# -f <center of tv signal channel freq>
+# -g <appropriate gain for best signal / noise>
+#
+# All this module does is multiply the sample rate by 3, from 6.4e6 to
+# 19.2e6 complex samples / sec, then lowpass filter with a cutoff of 3.2MHz
+# and a transition band width of .5MHz. Center of the tv channels is
+# then at 0 with edges at -3.2MHz and 3.2MHz.
+
+from gnuradio import gr
+import sys
+
+def graph (args):
+
+ nargs = len (args)
+ if nargs == 1:
+ infile = args[0]
+ else:
+ sys.stderr.write('usage: interp.py input_file\n')
+ sys.exit (1)
+
+ sampling_freq = 6400000
+
+ fg = gr.flow_graph ()
+
+ src0 = gr.file_source (gr.sizeof_gr_complex,infile)
+ src1 = gr.sig_source_c (sampling_freq, gr.GR_CONST_WAVE, 1, 0)
+ src2 = gr.sig_source_c (sampling_freq, gr.GR_CONST_WAVE, 1, 0)
+
+ interlv = gr.interleave(gr.sizeof_gr_complex)
+
+ lp_coeffs = gr.firdes.low_pass ( 3, 19.2e6, 3.2e6, .5e6, gr.firdes.WIN_HAMMING )
+ lp = gr.fir_filter_ccf ( 1, lp_coeffs )
+
+ file = gr.file_sink(gr.sizeof_gr_complex,"/tmp/atsc_pipe_1")
+
+ fg.connect( src0, (interlv, 0) )
+ fg.connect( src1, (interlv, 1) )
+ fg.connect( src2, (interlv, 2) )
+ fg.connect( interlv, lp, file )
+
+ fg.start()
+ raw_input ('Head End: Press Enter to stop')
+ fg.stop()
+
+if __name__ == '__main__':
+ graph (sys.argv[1:])
+
+
--
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