diff options
| author | cswiger <cswiger@221aa14e-8319-0410-a670-987f0aec2ac5> | 2007-04-23 10:45:42 +0000 |
|---|---|---|
| committer | cswiger <cswiger@221aa14e-8319-0410-a670-987f0aec2ac5> | 2007-04-23 10:45:42 +0000 |
| commit | d049678e49aefaa823ce45bd9310e2e43c93e1cf (patch) | |
| tree | ed7b5a030611df1e4ca916bf19717a165e1bab9f /gr-atsc/src/python/interp.py | |
| parent | aaf51ed7d99ba7cb9badd38c15e8643425b8bf78 (diff) | |
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
Diffstat (limited to 'gr-atsc/src/python/interp.py')
| -rwxr-xr-x | gr-atsc/src/python/interp.py | 74 |
1 files changed, 74 insertions, 0 deletions
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:]) + + |