1 files changed, 58 insertions, 0 deletions
diff --git a/gr-atsc/python/xlate.py b/gr-atsc/python/xlate.py
new file mode 100755
index 0000000000..3d049ac524
--- /dev/null
+++ b/gr-atsc/python/xlate.py
@@ -0,0 +1,58 @@
+#!/usr/bin/env /usr/bin/python
+#
+# Copyright 2004,2007 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 3, 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 upconverts the 19.2e6 sample rate signal from a center
+# of 0 to 5.75e6 and converts to float, to prepare the signal for
+# the old gnuradio 0.9 block (bit timing loop, field sync checker,
+# equalizer and field sync demux), effectively simulating an
+# mc4020 card, except the sample rate is 19.2e6 instead of 20e6.
+#
+# The signal is then centered on 5.75e6 with edges at 5.75 + 3.2 = 8.95MHz
+# and 5.75 - 3.2 = 2.55Mhz, low pass filtered with cutoff at 9Mhz and a
+# transition band width of 1Mhz.
+#
+# Input complex -3.2 to 3.2Mhz, output float 2.55 to 8.95Mhz.
+
+from gnuradio import gr
+from gnuradio import filter
+from gnuradio import blocks
+import os
+
+def graph ():
+    print os.getpid()
+    sampling_freq = 19200000
+
+    tb = gr.top_block ()
+
+    src0 = blocks.file_source(gr.sizeof_gr_complex,"/tmp/atsc_pipe_1")
+
+    duc_coeffs = filter.firdes.low_pass( 1, 19.2e6, 9e6, 1e6, filter.firdes.WIN_HAMMING )
+    duc = filter.freq_xlating_fir_filter_ccf( 1 duc_coeffs, 5.75e6, 19.2e6 )
+
+    c2f = blocks.complex_to_float()
+    file = blocks.file_sink(gr.sizeof_float,"/tmp/atsc_pipe_2")
+
+    tb.connect( src0, duc, c2f, file )
+
+    tb.run()
+
+if __name__ == '__main__':
+    graph ()