diff options
| author | Tom Rondeau <trondeau@vt.edu> | 2013-03-15 20:49:05 -0400 |
|---|---|---|
| committer | Tom Rondeau <trondeau@vt.edu> | 2013-03-15 20:49:05 -0400 |
| commit | 3d38e82e7d87dfc01132b199e33b53add8a706fa (patch) | |
| tree | af4545bcf3cea24dc30571601116a3a89381ad5d /gr-atsc/python/xlate.py | |
| parent | 39ff6d4814c858f2dbaf3c8007940872c46d6c95 (diff) | |
atsc: adjustments to atsc to start to conform to v3.7 structure.
Not going to comply completely with the new structure; just wanted to get it so that it looked more consistent once installed.
Diffstat (limited to 'gr-atsc/python/xlate.py')
| -rwxr-xr-x | gr-atsc/python/xlate.py | 58 |
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 () |