diff options
Diffstat (limited to 'gr-pager/src/flex_demod.py')
| -rw-r--r-- | gr-pager/src/flex_demod.py | 33 |
1 files changed, 25 insertions, 8 deletions
diff --git a/gr-pager/src/flex_demod.py b/gr-pager/src/flex_demod.py index 8326c9fa5..95a6517a1 100644 --- a/gr-pager/src/flex_demod.py +++ b/gr-pager/src/flex_demod.py @@ -23,9 +23,9 @@ from gnuradio import gr, optfir from math import pi import pager_swig -class flex_demod(gr.hier_block): +class flex_demod: """ - FLEX protocol demodulation block. + FLEX pager protocol demodulation block. This block demodulates a band-limited, complex down-converted baseband channel into FLEX protocol frames. @@ -35,7 +35,9 @@ class flex_demod(gr.hier_block): 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) - DEFRAMER - Syncronizes symbol stream and outputs FLEX codewords + 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 @@ -46,12 +48,27 @@ class flex_demod(gr.hier_block): def __init__(self, fg, channel_rate): k = channel_rate/(2*pi*4800) # 4800 Hz max deviation QUAD = gr.quadrature_demod_cf(k) - + self.INPUT = QUAD + taps = optfir.low_pass(1.0, channel_rate, 3200, 6400, 0.1, 60) LPF = gr.fir_filter_fff(1, taps) SLICER = pager_swig.slicer_fb(.001, .00001) # Attack, decay - DEFRAMER = pager_swig.flex_deframer(channel_rate) - - fg.connect(QUAD, LPF, SLICER, DEFRAMER) + SYNC = pager_swig.flex_sync(channel_rate) + fg.connect(QUAD, LPF, SLICER, SYNC) + + DEINTA = pager_swig.flex_deinterleave() + PARSEA = pager_swig.flex_parse() - gr.hier_block.__init__(self, fg, QUAD, DEFRAMER) + DEINTB = pager_swig.flex_deinterleave() + PARSEB = pager_swig.flex_parse() + + DEINTC = pager_swig.flex_deinterleave() + PARSEC = pager_swig.flex_parse() + + DEINTD = pager_swig.flex_deinterleave() + PARSED = pager_swig.flex_parse() + + fg.connect((SYNC, 0), DEINTA, PARSEA) + fg.connect((SYNC, 1), DEINTB, PARSEB) + fg.connect((SYNC, 2), DEINTC, PARSEC) + fg.connect((SYNC, 3), DEINTD, PARSED) |