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Diffstat (limited to 'gr-atsc/src/python/fpll.py')
| -rwxr-xr-x | gr-atsc/src/python/fpll.py | 88 |
1 files changed, 0 insertions, 88 deletions
diff --git a/gr-atsc/src/python/fpll.py b/gr-atsc/src/python/fpll.py deleted file mode 100755 index dee81da13d..0000000000 --- a/gr-atsc/src/python/fpll.py +++ /dev/null @@ -1,88 +0,0 @@ -#!/usr/bin/env python -# -# Copyright 2004,2005 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. -# - -from gnuradio import gr, atsc -from gnuradio import blocks -from gnuradio import filter -import math, os - -def main(): - - print os.getpid() - - tb = gr.top_block() - - u = blocks.file_source(gr.sizeof_float,"/tmp/atsc_pipe_2") - - 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() - - out = blocks.file_sink(gr.sizeof_float,"/tmp/atsc_pipe_3") - # out = blocks.file_sink(gr.sizeof_float,"/mnt/sata/atsc_data_float") - - tb.connect(u, fpll, lp_filter) - tb.connect(lp_filter, iir) - tb.connect(lp_filter, (remove_dc,0)) - tb.connect(iir, (remove_dc,1)) - tb.connect(remove_dc, out) - - tb.run() - - -if __name__ == '__main__': - main () - - - |