From 3d38e82e7d87dfc01132b199e33b53add8a706fa Mon Sep 17 00:00:00 2001
From: Tom Rondeau <trondeau@vt.edu>
Date: Fri, 15 Mar 2013 20:49:05 -0400
Subject: 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.
---
gr-atsc/src/python/all_atsc.py | 142 -----------------------------------------
1 file changed, 142 deletions(-)
delete mode 100644 gr-atsc/src/python/all_atsc.py
(limited to 'gr-atsc/src/python/all_atsc.py')
diff --git a/gr-atsc/src/python/all_atsc.py b/gr-atsc/src/python/all_atsc.py
deleted file mode 100644
index 7cac785149..0000000000
--- a/gr-atsc/src/python/all_atsc.py
+++ /dev/null
@@ -1,142 +0,0 @@
-#!/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:
-#
-# uhd_rx_cfile.py --samp-rate=6.4e6
-# -f <center of tv signal channel freq>
-# -g <appropriate gain for best signal / noise>
-# -s output shorts
-#
-# 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, atsc
-from gnuradio import filter
-from gnuradio import blocks
-import sys, os, math
-
-def graph (args):
-
- nargs = len(args)
- if nargs == 2:
- infile = args[0]
- outfile = args[1]
- else:
- raise ValueError('usage: interp.py input_file output_file\n')
-
- tb = gr.top_block ()
-
- # Convert to a from shorts to a stream of complex numbers.
- srcf = blocks.file_source (gr.sizeof_short,infile)
- s2ss = blocks.stream_to_streams(gr.sizeof_short,2)
- s2f1 = blocks.short_to_float()
- s2f2 = blocks.short_to_float()
- src0 = blocks.float_to_complex()
- tb.connect(srcf, s2ss)
- tb.connect((s2ss, 0), s2f1, (src0, 0))
- tb.connect((s2ss, 1), s2f2, (src0, 1))
-
- # Low pass filter it and increase sample rate by a factor of 3.
- lp_coeffs = filter.firdes.low_pass ( 3, 19.2e6, 3.2e6, .5e6, filter.firdes.WIN_HAMMING )
- lp = filter.interp_fir_filter_ccf ( 3, lp_coeffs )
- tb.connect(src0, lp)
-
- # Upconvert it.
- 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 )
- # Discard the imaginary component.
- c2f = blocks.complex_to_float()
- tb.connect(lp, duc, c2f)
-
- # Frequency Phase Lock Loop
- input_rate = 19.2e6
- IF_freq = 5.75e6
- # 1/2 as wide because we're designing lp filter
- symbol_rate = atsc.ATSC_SYMBOL_RATE/2.
- NTAPS = 279
- tt = filter.firdes.root_raised_cosine (1.0, input_rate, symbol_rate, .115, NTAPS)
- # heterodyne the low pass coefficients up to the specified bandpass
- # center frequency. Note that when we do this, the filter bandwidth
- # is effectively twice the low pass (2.69 * 2 = 5.38) and hence
- # matches the diagram in the ATSC spec.
- arg = 2. * math.pi * IF_freq / input_rate
- t=[]
- for i in range(len(tt)):
- t += [tt[i] * 2. * math.cos(arg * i)]
- rrc = filter.fir_filter_fff(1, t)
-
- fpll = atsc.fpll()
-
- pilot_freq = IF_freq - 3e6 + 0.31e6
- lower_edge = 6e6 - 0.31e6
- upper_edge = IF_freq - 3e6 + pilot_freq
- transition_width = upper_edge - lower_edge
- lp_coeffs = filter.firdes.low_pass(1.0,
- input_rate,
- (lower_edge + upper_edge) * 0.5,
- transition_width,
- filter.firdes.WIN_HAMMING);
-
- lp_filter = filter.fir_filter_fff(1,lp_coeffs)
-
- alpha = 1e-5
- iir = filter.single_pole_iir_filter_ff(alpha)
- remove_dc = blocks.sub_ff()
-
- tb.connect(c2f, fpll, lp_filter)
- tb.connect(lp_filter, iir)
- tb.connect(lp_filter, (remove_dc,0))
- tb.connect(iir, (remove_dc,1))
-
- # Bit Timing Loop, Field Sync Checker and Equalizer
-
- btl = atsc.bit_timing_loop()
- fsc = atsc.fs_checker()
- eq = atsc.equalizer()
- fsd = atsc.field_sync_demux()
-
- tb.connect(remove_dc, btl)
- tb.connect((btl, 0),(fsc, 0),(eq, 0),(fsd, 0))
- tb.connect((btl, 1),(fsc, 1),(eq, 1),(fsd, 1))
-
- # Viterbi
-
- viterbi = atsc.viterbi_decoder()
- deinter = atsc.deinterleaver()
- rs_dec = atsc.rs_decoder()
- derand = atsc.derandomizer()
- depad = atsc.depad()
- dst = blocks.file_sink(gr.sizeof_char, outfile)
- tb.connect(fsd, viterbi, deinter, rs_dec, derand, depad, dst)
-
- dst2 = blocks.file_sink(gr.sizeof_gr_complex, "atsc_complex.data")
- tb.connect(src0, dst2)
-
- tb.run ()
-
-if __name__ == '__main__':
- graph (sys.argv[1:])
-
-
--
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