diff options
| author | eb <eb@221aa14e-8319-0410-a670-987f0aec2ac5> | 2006-10-18 01:35:09 +0000 |
|---|---|---|
| committer | eb <eb@221aa14e-8319-0410-a670-987f0aec2ac5> | 2006-10-18 01:35:09 +0000 |
| commit | c3a8f2199f6bdd9389f59f08069886e271888880 (patch) | |
| tree | f6d41c610d7bd0a8625c8db852524b7da938b2da /gr-pager/src/flex_demod.py | |
| parent | d3764678fda9c37f38a012c96771934a8cab8ba3 (diff) | |
moved out of trunk
git-svn-id: http://gnuradio.org/svn/gnuradio/trunk@3815 221aa14e-8319-0410-a670-987f0aec2ac5
Diffstat (limited to 'gr-pager/src/flex_demod.py')
| -rw-r--r-- | gr-pager/src/flex_demod.py | 88 |
1 files changed, 0 insertions, 88 deletions
diff --git a/gr-pager/src/flex_demod.py b/gr-pager/src/flex_demod.py deleted file mode 100644 index a8c6f09b13..0000000000 --- a/gr-pager/src/flex_demod.py +++ /dev/null @@ -1,88 +0,0 @@ -# -# Copyright 2006 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., 51 Franklin Street, -# Boston, MA 02110-1301, USA. -# - -from gnuradio import gr, gru, optfir, blks -from math import pi -import pager_swig - -chan_rate = 16000 - -class flex_demod: - """ - FLEX pager protocol demodulation block. - - This block demodulates a band-limited, complex down-converted baseband - channel into FLEX protocol frames. - - Flow graph (so far): - - RSAMP - Resample incoming stream to 16000 sps - QUAD - Quadrature demodulator converts FSK to baseband amplitudes - LPF - Low pass filter to remove noise prior to slicer - SLICER - Converts input to one of four symbols (0, 1, 2, 3) - SYNC - Converts symbol stream to four phases of FLEX blocks - DEINTx - Deinterleaves FLEX blocks into datawords - PARSEx - Parse a single FLEX phase worth of data words into pages - --- - - @param fg: flowgraph - @param channel_rate: incoming sample rate of the baseband channel - @type sample_rate: integer - """ - - - def __init__(self, fg, channel_rate, queue): - k = chan_rate/(2*pi*4800) # 4800 Hz max deviation - QUAD = gr.quadrature_demod_cf(k) - self.INPUT = QUAD - - if channel_rate != chan_rate: - interp = gru.lcm(channel_rate, chan_rate)/channel_rate - decim = gru.lcm(channel_rate, chan_rate)/chan_rate - RESAMP = blks.rational_resampler_ccf(fg, interp, decim) - self.INPUT = RESAMP - - taps = optfir.low_pass(1.0, chan_rate, 3200, 6400, 0.1, 60) - LPF = gr.fir_filter_fff(1, taps) - SLICER = pager_swig.slicer_fb(.001, .00001) # Attack, decay - SYNC = pager_swig.flex_sync(chan_rate) - - if channel_rate != chan_rate: - fg.connect(RESAMP, QUAD, LPF, SLICER, SYNC) - else: - fg.connect(QUAD, LPF, SLICER, SYNC) - - DEINTA = pager_swig.flex_deinterleave() - PARSEA = pager_swig.flex_parse(queue) - - DEINTB = pager_swig.flex_deinterleave() - PARSEB = pager_swig.flex_parse(queue) - - DEINTC = pager_swig.flex_deinterleave() - PARSEC = pager_swig.flex_parse(queue) - - DEINTD = pager_swig.flex_deinterleave() - PARSED = pager_swig.flex_parse(queue) - - fg.connect((SYNC, 0), DEINTA, PARSEA) - fg.connect((SYNC, 1), DEINTB, PARSEB) - fg.connect((SYNC, 2), DEINTC, PARSEC) - fg.connect((SYNC, 3), DEINTD, PARSED) |