def __init__(self, traffic_msgq=None, key=None):
gr.hier_block2.__init__(self, "op25_decoder",
gr.io_signature(1, 1, gr.sizeof_float),
gr.io_signature(1, 1, gr.sizeof_float))
self.traffic_msgq = traffic_msgq
self.key = key
if self.traffic_msgq is None:
self.traffic_msgq = gr.msg_queue(2)
self.slicer = None
try:
levels = [ -2.0, 0.0, 2.0, 4.0 ]
self.slicer = _op25.fsk4_slicer_fb(levels)
self.p25_decoder = _op25.decoder_bf()
self.p25_decoder.set_msgq(self.traffic_msgq)
if _verbose:
print "Using new decoder_bf"
except:
try:
self.p25_decoder = _op25.decoder_ff(self.traffic_msgq) # LEGACY
if _verbose:
print "Using legacy decoder_ff"
except:
raise Exception("Could not find a decoder to use")
if (self.key is not None) and (len(self.key) > 0): # Relates to key string passed in from GRC block
self.set_key(self.key)
if self.slicer:
self.connect(self, self.slicer, self.p25_decoder)
else:
self.connect(self, self.p25_decoder)
self.connect(self.p25_decoder, self)
def __init__(self, traffic_msgq=None, key=None):
gr.hier_block2.__init__(self, "op25_decoder",
gr.io_signature(1, 1, gr.sizeof_float),
gr.io_signature(1, 1, gr.sizeof_float))
self.traffic_msgq = traffic_msgq
self.key = key
if self.traffic_msgq is None:
self.traffic_msgq = gr.msg_queue(2)
self.slicer = None
try:
levels = [-2.0, 0.0, 2.0, 4.0]
self.slicer = _op25.fsk4_slicer_fb(levels)
self.p25_decoder = _op25.decoder_bf()
self.p25_decoder.set_msgq(self.traffic_msgq)
if _verbose:
print "Using new decoder_bf"
except:
try:
self.p25_decoder = _op25.decoder_ff(
self.traffic_msgq) # LEGACY
if _verbose:
print "Using legacy decoder_ff"
except:
raise Exception("Could not find a decoder to use")
if (self.key is not None) and (
len(self.key) >
0): # Relates to key string passed in from GRC block
self.set_key(self.key)
if self.slicer:
self.connect(self, self.slicer, self.p25_decoder)
else:
self.connect(self, self.p25_decoder)
self.connect(self.p25_decoder, self)
def create(self):
self.op25_msgq = gr.msg_queue(2)
self.slicer = None
try:
levels = [ -2.0, 0.0, 2.0, 4.0 ]
self.slicer = _op25.fsk4_slicer_fb(levels)
self.p25_decoder = _op25.decoder_bf() # FIXME: Message queue?
if _verbose:
print "Using new decoder_bf"
except:
try:
self.p25_decoder = _op25.decoder_ff(self.op25_msgq) # LEGACY
if _verbose:
print "Using legacy decoder_ff"
except:
raise Exception("Could not find a decoder to use")
# Reference code
#self.decode_watcher = decode_watcher(self.op25_msgq, self.traffic)
if (self.key is not None) and (len(self.key) > 0): # Relates to key string passed in from GRC block
self.set_key(self.key)
# Reference code
#trans_width = 12.5e3 / 2;
#trans_centre = trans_width + (trans_width / 2)
# discriminator tap doesn't do freq. xlation, FM demodulation, etc.
# coeffs = gr.firdes.low_pass(1.0, capture_rate, trans_centre, trans_width, gr.firdes.WIN_HANN)
# self.channel_filter = gr.freq_xlating_fir_filter_ccf(channel_decim, coeffs, 0.0, capture_rate)
# self.set_channel_offset(0.0, 0, self.spectrum.win._units)
# # power squelch
# squelch_db = 0
# self.squelch = gr.pwr_squelch_cc(squelch_db, 1e-3, 0, True)
# self.set_squelch_threshold(squelch_db)
# # FM demodulator
# fm_demod_gain = channel_rate / (2.0 * pi * self.symbol_deviation)
# fm_demod = gr.quadrature_demod_cf(fm_demod_gain)
# symbol filter
#symbol_decim = 1
#symbol_coeffs = gr.firdes.root_raised_cosine(1.0, channel_rate, self.symbol_rate, 0.2, 500)
# boxcar coefficients for "integrate and dump" filter
#samples_per_symbol = channel_rate // self.symbol_rate
#symbol_duration = float(self.symbol_rate) / channel_rate
#print "Symbol duration:", symbol_duration
#print "Samples per symbol:", samples_per_symbol
#symbol_coeffs = (1.0/samples_per_symbol,)*samples_per_symbol
#self.symbol_filter = gr.fir_filter_fff(symbol_decim, symbol_coeffs)
# C4FM demodulator
#print "Symbol rate:", self.symbol_rate
if self.auto_tune_msgq is None:
self.auto_tune_msgq = gr.msg_queue(2)
try:
self.demod_fsk4 = _op25.fsk4_demod_ff(self.auto_tune_msgq, self.channel_rate, self.symbol_rate)
if _verbose:
print "Using new fsk4_demod_ff"
except:
try:
self.demod_fsk4 = fsk4.demod_ff(self.auto_tune_msgq, self.channel_rate, self.symbol_rate) # LEGACY
if _verbose:
print "Using legacy fsk4.demod_ff"
except:
raise Exception("Could not find a FSK4 demodulator to use")
# Reference code
#self.demod_watcher = demod_watcher(autotuneq, self.adjust_channel_offset)
#list = [[self, self.channel_filter, self.squelch, fm_demod, self.symbol_filter, demod_fsk4, self.p25_decoder, self.sink]]
self.connect(self, self.demod_fsk4)
if self.slicer:
self.connect(self.demod_fsk4, self.slicer)
self.connect(self.slicer, self.p25_decoder)
else:
self.connect(self.demod_fsk4, self.p25_decoder)
self.connect(self.p25_decoder, (self, 0))
if self.output_dibits:
self.connect(self.demod_fsk4, (self, 1))
def create(self):
self.op25_msgq = gr.msg_queue(2)
self.slicer = None
try:
levels = [-2.0, 0.0, 2.0, 4.0]
self.slicer = _op25.fsk4_slicer_fb(levels)
self.p25_decoder = _op25.decoder_bf() # FIXME: Message queue?
if _verbose:
print "Using new decoder_bf"
except:
try:
self.p25_decoder = _op25.decoder_ff(self.op25_msgq) # LEGACY
if _verbose:
print "Using legacy decoder_ff"
except:
raise Exception("Could not find a decoder to use")
# Reference code
#self.decode_watcher = decode_watcher(self.op25_msgq, self.traffic)
if (self.key is not None) and (
len(self.key) >
0): # Relates to key string passed in from GRC block
self.set_key(self.key)
# Reference code
#trans_width = 12.5e3 / 2;
#trans_centre = trans_width + (trans_width / 2)
# discriminator tap doesn't do freq. xlation, FM demodulation, etc.
# coeffs = gr.firdes.low_pass(1.0, capture_rate, trans_centre, trans_width, gr.firdes.WIN_HANN)
# self.channel_filter = gr.freq_xlating_fir_filter_ccf(channel_decim, coeffs, 0.0, capture_rate)
# self.set_channel_offset(0.0, 0, self.spectrum.win._units)
# # power squelch
# squelch_db = 0
# self.squelch = gr.pwr_squelch_cc(squelch_db, 1e-3, 0, True)
# self.set_squelch_threshold(squelch_db)
# # FM demodulator
# fm_demod_gain = channel_rate / (2.0 * pi * self.symbol_deviation)
# fm_demod = gr.quadrature_demod_cf(fm_demod_gain)
# symbol filter
#symbol_decim = 1
#symbol_coeffs = gr.firdes.root_raised_cosine(1.0, channel_rate, self.symbol_rate, 0.2, 500)
# boxcar coefficients for "integrate and dump" filter
#samples_per_symbol = channel_rate // self.symbol_rate
#symbol_duration = float(self.symbol_rate) / channel_rate
#print "Symbol duration:", symbol_duration
#print "Samples per symbol:", samples_per_symbol
#symbol_coeffs = (1.0/samples_per_symbol,)*samples_per_symbol
#self.symbol_filter = gr.fir_filter_fff(symbol_decim, symbol_coeffs)
# C4FM demodulator
#print "Symbol rate:", self.symbol_rate
if self.auto_tune_msgq is None:
self.auto_tune_msgq = gr.msg_queue(2)
try:
self.demod_fsk4 = _op25.fsk4_demod_ff(self.auto_tune_msgq,
self.channel_rate,
self.symbol_rate)
if _verbose:
print "Using new fsk4_demod_ff"
except:
try:
self.demod_fsk4 = fsk4.demod_ff(self.auto_tune_msgq,
self.channel_rate,
self.symbol_rate) # LEGACY
if _verbose:
print "Using legacy fsk4.demod_ff"
except:
raise Exception("Could not find a FSK4 demodulator to use")
# Reference code
#self.demod_watcher = demod_watcher(autotuneq, self.adjust_channel_offset)
#list = [[self, self.channel_filter, self.squelch, fm_demod, self.symbol_filter, demod_fsk4, self.p25_decoder, self.sink]]
self.connect(self, self.demod_fsk4)
if self.slicer:
self.connect(self.demod_fsk4, self.slicer)
self.connect(self.slicer, self.p25_decoder)
else:
self.connect(self.demod_fsk4, self.p25_decoder)
self.connect(self.p25_decoder, (self, 0))
if self.output_dibits:
self.connect(self.demod_fsk4, (self, 1))
