def __init__(self, options, queue):
gr.top_block.__init__(self)
if options.filename is not None:
self.fs = gr.file_source(gr.sizeof_gr_complex, options.filename)
self.rate = options.rate
else:
self.u = uhd.usrp_source(options.addr,
io_type=uhd.io_type.COMPLEX_FLOAT32,
num_channels=1)
if options.subdev is not None:
self.u.set_subdev_spec(options.subdev, 0)
self.u.set_samp_rate(options.rate)
self.rate = self.u.get_samp_rate()
# Set the antenna
if(options.antenna):
self.u.set_antenna(options.antenna, 0)
self.centerfreq = options.centerfreq
print "Tuning to: %fMHz" % (self.centerfreq - options.error)
if not(self.tune(options.centerfreq - options.error)):
print "Failed to set initial frequency"
if options.gain is None: #set to halfway
g = self.u.get_gain_range()
options.gain = (g.start()+g.stop()) / 2.0
print "Setting gain to %i" % options.gain
self.u.set_gain(options.gain)
self.u.set_bandwidth(options.bandwidth)
print "Samples per second is %i" % self.rate
self._syms_per_sec = 3600;
options.samples_per_second = self.rate
options.syms_per_sec = self._syms_per_sec
options.gain_mu = 0.01
options.mu=0.5
options.omega_relative_limit = 0.3
options.syms_per_sec = self._syms_per_sec
options.offset = options.centerfreq - options.freq
print "Control channel offset: %f" % options.offset
self.demod = fsk_demod(options)
self.start_correlator = gr.correlate_access_code_tag_bb("10101100",
0,
"smartnet_preamble") #should mark start of packet
self.smartnet_deinterleave = smartnet.deinterleave()
self.smartnet_crc = smartnet.crc(queue)
if options.filename is None:
self.connect(self.u, self.demod)
else:
self.connect(self.fs, self.demod)
self.connect(self.demod, self.start_correlator, self.smartnet_deinterleave, self.smartnet_crc)
#hook up the audio patch
if options.audio:
self.audiorate = 48000
self.audiotaps = gr.firdes.low_pass(1, self.rate, 8000, 2000, gr.firdes.WIN_HANN)
self.prefilter_decim = int(self.rate / self.audiorate) #might have to use a rational resampler for audio
print "Prefilter decimation: %i" % self.prefilter_decim
self.audio_prefilter = gr.freq_xlating_fir_filter_ccf(self.prefilter_decim, #decimation
self.audiotaps, #taps
0, #freq offset
self.rate) #sampling rate
#on a trunked network where you know you will have good signal, a carrier power squelch works well. real FM receviers use a noise squelch, where
#the received audio is high-passed above the cutoff and then fed to a reverse squelch. If the power is then BELOW a threshold, open the squelch.
self.squelch = gr.pwr_squelch_cc(options.squelch, #squelch point
alpha = 0.1, #wat
ramp = 10, #wat
gate = False)
self.audiodemod = blks2.fm_demod_cf(self.rate/self.prefilter_decim, #rate
1, #audio decimation
4000, #deviation
3000, #audio passband
4000, #audio stopband
1, #gain
75e-6) #deemphasis constant
#the filtering removes FSK data woobling from the subaudible channel (might be able to combine w/lpf above)
self.audiofilttaps = gr.firdes.high_pass(1, self.audiorate, 300, 50, gr.firdes.WIN_HANN)
self.audiofilt = gr.fir_filter_fff(1, self.audiofilttaps)
self.audiogain = gr.multiply_const_ff(options.volume)
self.audiosink = audio.sink (self.audiorate, "")
# self.audiosink = gr.wavfile_sink("test.wav", 1, self.audiorate, 8)
self.mute()
if options.filename is None:
self.connect(self.u, self.audio_prefilter)
else:
self.connect(self.fs, self.audio_prefilter)
# self.connect(self.audio_prefilter, self.squelch, self.audiodemod, self.audiofilt, self.audiogain, self.audioresamp, self.audiosink)
self.connect(self.audio_prefilter, self.squelch, self.audiodemod, self.audiofilt, self.audiogain, self.audiosink)
def __init__(self, talkgroup, options):
gr.hier_block2.__init__(
self,
"fsk_demod",
gr.io_signature(1, 1, gr.sizeof_gr_complex), # Input signature
gr.io_signature(0, 0, gr.sizeof_char)) # Output signature
#print "Starting log_receiver init()"
self.audiorate = options.audiorate
self.rate = options.rate
self.talkgroup = talkgroup
self.directory = options.directory
if options.squelch is None:
options.squelch = 28
if options.volume is None:
options.volume = 3.0
self.audiotaps = gr.firdes.low_pass(1, self.rate, 8000, 2000,
gr.firdes.WIN_HANN)
self.prefilter_decim = int(self.rate / self.audiorate)
#the audio prefilter is a channel selection filter.
self.audio_prefilter = gr.freq_xlating_fir_filter_ccf(
self.prefilter_decim, #decimation
self.audiotaps, #taps
0, #freq offset
int(self.rate)) #sampling rate
#on a trunked network where you know you will have good signal, a carrier power squelch works well. real FM receviers use a noise squelch, where
#the received audio is high-passed above the cutoff and then fed to a reverse squelch. If the power is then BELOW a threshold, open the squelch.
self.squelch = gr.pwr_squelch_cc(
options.squelch, #squelch point
alpha=0.1, #wat
ramp=10, #wat
gate=True
) #gated so that the audio recording doesn't contain blank spaces between transmissions
self.audiodemod = blks2.fm_demod_cf(
self.rate / self.prefilter_decim, #rate
1, #audio decimation
4000, #deviation
3000, #audio passband
4000, #audio stopband
options.volume, #gain
75e-6) #deemphasis constant
#the filtering removes FSK data woobling from the subaudible channel
self.audiofilttaps = gr.firdes.high_pass(1, self.audiorate, 300, 50,
gr.firdes.WIN_HANN)
self.audiofilt = gr.fir_filter_fff(1, self.audiofilttaps)
#self.audiogain = gr.multiply_const_ff(options.volume)
#here we generate a random filename in the form /tmp/[random].wav, and then use it for the wavstamp block. this avoids collisions later on. remember to clean up these files when deallocating.
self.tmpfilename = "/tmp/%s.wav" % (
"".join([
random.choice(string.letters + string.digits) for x in range(8)
])
) #if this looks glaringly different, it's because i totally cribbed it from a blog.
self.valve = grc_blks2.valve(gr.sizeof_float, bool(1))
#self.prefiltervalve = grc_blks2.valve(gr.sizeof_gr_complex, bool(1))
#open the logfile for appending
self.timestampfilename = "%s/%i.txt" % (self.directory, self.talkgroup)
self.timestampfile = open(self.timestampfilename, 'a')
self.filename = "%s/%i.wav" % (self.directory, self.talkgroup)
self.audiosink = smartnet.wavsink(
self.filename, 1, self.audiorate,
8) #this version allows appending to existing files.
# self.connect(self, self.audio_prefilter, self.squelch, self.audiodemod, self.valve, self.audiofilt, self.audiosink)
self.connect(self, self.audio_prefilter, self.audiodemod, self.valve,
self.audiofilt, self.audiosink)
self.timestamp = 0.0
#print "Finishing logging receiver init()."
self.mute() #start off muted.
def __init__(self, talkgroup, options):
gr.hier_block2.__init__(
self,
"fsk_demod",
gr.io_signature(1, 1, gr.sizeof_gr_complex), # Input signature
gr.io_signature(0, 0, gr.sizeof_char)) # Output signature
print "Starting log_receiver init()"
self.samp_rate = samp_rate = int(options.rate)
self.samp_per_sym = samp_per_sym = 10
self.decim = decim = 20
self.xlate_bandwidth = xlate_bandwidth = 24260.0
self.xlate_offset = xlate_offset = 0
self.channel_rate = channel_rate = op25.SYMBOL_RATE * samp_per_sym
self.audio_mul = audio_mul = 1
self.pre_channel_rate = pre_channel_rate = int(samp_rate / decim)
self.squelch = squelch = -55
self.auto_tune_offset = auto_tune_offset = 0
self.audiorate = 44100 #options.audiorate
self.rate = options.rate
self.talkgroup = talkgroup
self.directory = options.directory
if options.squelch is None:
options.squelch = 28
if options.volume is None:
options.volume = 3.0
##################################################
# Blocks
##################################################
print "Setting up Blocks"
self.audiotaps = gr.firdes.low_pass(1, samp_rate, 8000, 2000,
gr.firdes.WIN_HANN)
self.prefilter_decim = int(self.rate / self.audiorate)
#the audio prefilter is a channel selection filter.
self.audio_prefilter = gr.freq_xlating_fir_filter_ccf(
self.prefilter_decim, #decimation
self.audiotaps, #taps
0, #freq offset
int(samp_rate)) #sampling rate
self.audiodemod = blks2.fm_demod_cf(
self.rate / self.prefilter_decim, #rate
1, #audio decimation
4000, #deviation
3000, #audio passband
4000, #audio stopband
options.volume, #gain
75e-6) #deemphasis constant
#the filtering removes FSK data woobling from the subaudible channel
self.audiofilttaps = gr.firdes.high_pass(1, self.audiorate, 300, 50,
gr.firdes.WIN_HANN)
self.audiofilt = gr.fir_filter_fff(1, self.audiofilttaps)
self.gr_quadrature_demod_cf_0 = analog.quadrature_demod_cf(
1.6) #(channel_rate/(2.0 * math.pi * op25.SYMBOL_DEVIATION)))
self.gr_freq_xlating_fir_filter_xxx_0 = filter.freq_xlating_fir_filter_ccc(
decim, (firdes.low_pass(1, samp_rate, xlate_bandwidth / 2, 2000)),
0, samp_rate)
self.gr_fir_filter_xxx_0 = filter.fir_filter_fff(
1, ((1.0 / samp_per_sym, ) * samp_per_sym))
self.blocks_multiply_const_vxx_0 = blocks.multiply_const_vff(
(10.**(audio_mul / 10.), ))
self.blks2_rational_resampler_xxx_1 = blks2.rational_resampler_ccc(
interpolation=channel_rate,
decimation=pre_channel_rate,
taps=None,
fractional_bw=None,
)
self.blks2_rational_resampler_xxx_0 = blks2.rational_resampler_fff(
interpolation=self.audiorate,
decimation=8000,
taps=None,
fractional_bw=None,
)
#here we generate a random filename in the form /tmp/[random].wav, and then use it for the wavstamp block. this avoids collisions later on. remember to clean up these files when deallocating.
self.tmpfilename = "/tmp/%s.wav" % (
"".join([
random.choice(string.letters + string.digits) for x in range(8)
])
) #if this looks glaringly different, it's because i totally cribbed it from a blog.
self.valve = grc_blks2.valve(gr.sizeof_float, bool(1))
self.dsd_block_ff_0 = dsd.block_ff(dsd.dsd_FRAME_AUTO_DETECT,
dsd.dsd_MOD_AUTO_SELECT, 3, 2, True)
#open the logfile for appending
self.timestampfilename = "%s/%i.txt" % (self.directory, self.talkgroup)
self.timestampfile = open(self.timestampfilename, 'a')
self.filename = "%s/%i.wav" % (self.directory, self.talkgroup)
self.audiosink = smartnet.wavsink(
self.filename, 1, self.audiorate, 8
) #blocks.wavfile_sink(self.filename, 1, self.audiorate, 8) this version allows appending to existing files.
self.audio_sink_0 = audio.sink(44100, "", True)
self.timestamp = 0.0
#print "Finishing logging receiver init()."
self.mute() #start off muted.
print "Connecting blocks"
##################################################
# Connections
##################################################
self.connect(self.blks2_rational_resampler_xxx_0,
self.blocks_multiply_const_vxx_0)
self.connect(self.gr_fir_filter_xxx_0, self.valve, self.dsd_block_ff_0)
self.connect(self.dsd_block_ff_0, self.blks2_rational_resampler_xxx_0)
## Start
self.connect(self, self.gr_freq_xlating_fir_filter_xxx_0,
self.blks2_rational_resampler_xxx_1,
self.gr_quadrature_demod_cf_0, self.gr_fir_filter_xxx_0)
## End
# self.connect(self.blocks_multiply_const_vxx_0, self.audio_sink_0) # Plays the audio
self.connect(self.blocks_multiply_const_vxx_0,
self.audiosink) # Records the audio
def __init__(self, options, queue):
gr.top_block.__init__(self)
if options.filename is not None:
self.fs = gr.file_source(gr.sizeof_gr_complex, options.filename)
self.rate = options.rate
else:
self.u = uhd.usrp_source(options.addr,
io_type=uhd.io_type.COMPLEX_FLOAT32,
num_channels=1)
if options.subdev is not None:
self.u.set_subdev_spec(options.subdev, 0)
self.u.set_samp_rate(options.rate)
self.rate = self.u.get_samp_rate()
# Set the antenna
if (options.antenna):
self.u.set_antenna(options.antenna, 0)
self.centerfreq = options.centerfreq
print "Tuning to: %fMHz" % (self.centerfreq - options.error)
if not (self.tune(options.centerfreq - options.error)):
print "Failed to set initial frequency"
if options.gain is None: #set to halfway
g = self.u.get_gain_range()
options.gain = (g.start() + g.stop()) / 2.0
print "Setting gain to %i" % options.gain
self.u.set_gain(options.gain)
self.u.set_bandwidth(options.bandwidth)
print "Samples per second is %i" % self.rate
self._syms_per_sec = 3600
options.samples_per_second = self.rate
options.syms_per_sec = self._syms_per_sec
options.gain_mu = 0.01
options.mu = 0.5
options.omega_relative_limit = 0.3
options.syms_per_sec = self._syms_per_sec
options.offset = options.centerfreq - options.freq
print "Control channel offset: %f" % options.offset
self.demod = fsk_demod(options)
self.start_correlator = gr.correlate_access_code_tag_bb(
"10101100", 0, "smartnet_preamble") #should mark start of packet
self.smartnet_deinterleave = smartnet.deinterleave()
self.smartnet_crc = smartnet.crc(queue)
if options.filename is None:
self.connect(self.u, self.demod)
else:
self.connect(self.fs, self.demod)
self.connect(self.demod, self.start_correlator,
self.smartnet_deinterleave, self.smartnet_crc)
#hook up the audio patch
if options.audio:
self.audiorate = 48000
self.audiotaps = gr.firdes.low_pass(1, self.rate, 8000, 2000,
gr.firdes.WIN_HANN)
self.prefilter_decim = int(
self.rate / self.audiorate
) #might have to use a rational resampler for audio
print "Prefilter decimation: %i" % self.prefilter_decim
self.audio_prefilter = gr.freq_xlating_fir_filter_ccf(
self.prefilter_decim, #decimation
self.audiotaps, #taps
0, #freq offset
self.rate) #sampling rate
#on a trunked network where you know you will have good signal, a carrier power squelch works well. real FM receviers use a noise squelch, where
#the received audio is high-passed above the cutoff and then fed to a reverse squelch. If the power is then BELOW a threshold, open the squelch.
self.squelch = gr.pwr_squelch_cc(
options.squelch, #squelch point
alpha=0.1, #wat
ramp=10, #wat
gate=False)
self.audiodemod = blks2.fm_demod_cf(
self.rate / self.prefilter_decim, #rate
1, #audio decimation
4000, #deviation
3000, #audio passband
4000, #audio stopband
1, #gain
75e-6) #deemphasis constant
#the filtering removes FSK data woobling from the subaudible channel (might be able to combine w/lpf above)
self.audiofilttaps = gr.firdes.high_pass(1, self.audiorate, 300,
50, gr.firdes.WIN_HANN)
self.audiofilt = gr.fir_filter_fff(1, self.audiofilttaps)
self.audiogain = gr.multiply_const_ff(options.volume)
self.audiosink = audio.sink(self.audiorate, "")
# self.audiosink = gr.wavfile_sink("test.wav", 1, self.audiorate, 8)
self.mute()
if options.filename is None:
self.connect(self.u, self.audio_prefilter)
else:
self.connect(self.fs, self.audio_prefilter)
# self.connect(self.audio_prefilter, self.squelch, self.audiodemod, self.audiofilt, self.audiogain, self.audioresamp, self.audiosink)
self.connect(self.audio_prefilter, self.squelch, self.audiodemod,
self.audiofilt, self.audiogain, self.audiosink)
def __init__(self, options, queue):
gr.top_block.__init__(self)
if options.filename is not None:
self.fs = gr.file_source(gr.sizeof_gr_complex, options.filename)
self.rate = options.rate
else:
#self.u = uhd.usrp_source(options.addr,
# io_type=uhd.io_type.COMPLEX_FLOAT32,
# num_channels=1)
self.rtl = osmosdr.source_c(args="nchan=" + str(1) + " " + "")
self.rtl.set_sample_rate(options.rate)
self.rate = options.rate #self.rtl.get_samp_rate()
self.rtl.set_center_freq(options.centerfreq, 0)
#self.rtl.set_freq_corr(options.ppm, 0)
self.centerfreq = options.centerfreq
print "Tuning to: %fMHz" % (self.centerfreq - options.error)
if not (self.tune(options.centerfreq - options.error)):
print "Failed to set initial frequency"
if options.gain is None:
options.gain = 10
if options.bbgain is None:
options.bbgain = 25
if options.ifgain is None:
options.ifgain = 25
print "Setting RF gain to %i" % options.gain
print "Setting BB gain to %i" % options.bbgain
print "Setting IF gain to %i" % options.ifgain
self.rtl.set_gain(options.gain, 0)
self.rtl.set_if_gain(options.ifgain, 0)
self.rtl.set_bb_gain(options.bbgain, 0)
#self.rtl.set_gain_mode(1,0)
print "Samples per second is %i" % self.rate
self._syms_per_sec = 3600
options.samples_per_second = self.rate
options.syms_per_sec = self._syms_per_sec
options.gain_mu = 0.01
options.mu = 0.5
options.omega_relative_limit = 0.3
options.syms_per_sec = self._syms_per_sec
options.offset = options.centerfreq - options.freq
print "Control channel offset: %f" % options.offset
self.offset = gr.sig_source_c(self.rate, gr.GR_SIN_WAVE,
options.offset, 1.0, 0.0)
# for some reason using the xlating filter to do the offset makes thing barf with the HackRF, Multiply CC seems to work
options.offset = 0
self.mixer = gr.multiply_cc()
self.demod = fsk_demod(options)
self.start_correlator = gr.correlate_access_code_tag_bb(
"10101100", 0, "smartnet_preamble") #should mark start of packet
self.smartnet_deinterleave = smartnet.deinterleave()
self.smartnet_crc = smartnet.crc(queue)
#rerate = float(self.rate / float(first_decim)) / float(7200)
#print "resampling factor: %f\n" % rerate
#if rerate.is_integer():
# print "using pfb decimator\n"
# self.resamp = blks2.pfb_decimator_ccf(int(rerate))
#else:
# print "using pfb resampler\n"
# self.resamp = blks2.pfb_arb_resampler_ccf(1 / rerate)
if options.filename is None:
#self.connect(self.u, self.demod)
self.connect(self.rtl, (self.mixer, 0))
self.connect(self.offset, (self.mixer, 1))
self.connect(self.mixer, self.demod)
# self.connect(self.rtl, self.demod)
else:
self.connect(self.fs, self.demod)
self.connect(self.demod, self.start_correlator,
self.smartnet_deinterleave, self.smartnet_crc)
#hook up the audio patch
if options.audio:
self.audiorate = 48000
self.audiotaps = gr.firdes.low_pass(1, self.rate, 8000, 2000,
gr.firdes.WIN_HANN)
self.prefilter_decim = int(
self.rate / self.audiorate
) #might have to use a rational resampler for audio
print "Prefilter decimation: %i" % self.prefilter_decim
self.audio_prefilter = gr.freq_xlating_fir_filter_ccf(
self.prefilter_decim, #decimation
self.audiotaps, #taps
0, #freq offset
self.rate) #sampling rate
#on a trunked network where you know you will have good signal, a carrier power squelch works well. real FM receviers use a noise squelch, where
#the received audio is high-passed above the cutoff and then fed to a reverse squelch. If the power is then BELOW a threshold, open the squelch.
#self.squelch = gr.pwr_squelch_cc(options.squelch, #squelch point
# alpha = 0.1, #wat
# ramp = 10, #wat
# gate = False)
self.audiodemod = blks2.fm_demod_cf(
self.rate / self.prefilter_decim, #rate
1, #audio decimation
4000, #deviation
3000, #audio passband
4000, #audio stopband
1, #gain
75e-6) #deemphasis constant
#the filtering removes FSK data woobling from the subaudible channel (might be able to combine w/lpf above)
self.audiofilttaps = gr.firdes.high_pass(1, self.audiorate, 300,
50, gr.firdes.WIN_HANN)
self.audiofilt = gr.fir_filter_fff(1, self.audiofilttaps)
self.audiogain = gr.multiply_const_ff(options.volume)
self.audiosink = audio.sink(self.audiorate, "")
# self.audiosink = gr.wavfile_sink("test.wav", 1, self.audiorate, 8)
#self.mute()
if options.filename is None:
#self.connect(self.u, self.audio_prefilter)
self.connect(self.rtl, self.audio_prefilter)
else:
self.connect(self.fs, self.audio_prefilter)
# self.connect(self.audio_prefilter, self.squelch, self.audiodemod, self.audiofilt, self.audiogain, self.audioresamp, self.audiosink)
# real self.connect(self.audio_prefilter, self.squelch, self.audiodemod, self.audiofilt, self.audiogain, self.audiosink)
self.connect(self.audio_prefilter, self.audiodemod, self.audiofilt,
self.audiogain, self.audiosink)
def __init__(self, options, queue):
gr.top_block.__init__(self)
if options.filename is not None:
self.fs = gr.file_source(gr.sizeof_gr_complex, options.filename)
self.rate = options.rate
else:
#self.u = uhd.usrp_source(options.addr,
# io_type=uhd.io_type.COMPLEX_FLOAT32,
# num_channels=1)
self.rtl = osmosdr.source_c( args="nchan=" + str(1) + " " + "" )
self.rtl.set_sample_rate(options.rate)
self.rate = options.rate #self.rtl.get_samp_rate()
self.rtl.set_center_freq(options.centerfreq, 0)
#self.rtl.set_freq_corr(options.ppm, 0)
self.centerfreq = options.centerfreq
print "Tuning to: %fMHz" % (self.centerfreq - options.error)
if not(self.tune(options.centerfreq - options.error)):
print "Failed to set initial frequency"
if options.gain is None:
options.gain = 10
if options.bbgain is None:
options.bbgain = 25
if options.ifgain is None:
options.ifgain = 25
print "Setting RF gain to %i" % options.gain
print "Setting BB gain to %i" % options.bbgain
print "Setting IF gain to %i" % options.ifgain
self.rtl.set_gain(options.gain, 0)
self.rtl.set_if_gain(options.ifgain,0)
self.rtl.set_bb_gain(options.bbgain,0)
#self.rtl.set_gain_mode(1,0)
print "Samples per second is %i" % self.rate
self._syms_per_sec = 3600;
options.samples_per_second = self.rate
options.syms_per_sec = self._syms_per_sec
options.gain_mu = 0.01
options.mu=0.5
options.omega_relative_limit = 0.3
options.syms_per_sec = self._syms_per_sec
options.offset = options.centerfreq - options.freq
print "Control channel offset: %f" % options.offset
self.offset = gr.sig_source_c(self.rate, gr.GR_SIN_WAVE,
options.offset, 1.0, 0.0)
# for some reason using the xlating filter to do the offset makes thing barf with the HackRF, Multiply CC seems to work
options.offset = 0
self.mixer = gr.multiply_cc()
self.demod = fsk_demod(options)
self.start_correlator = gr.correlate_access_code_tag_bb("10101100",
0,
"smartnet_preamble") #should mark start of packet
self.smartnet_deinterleave = smartnet.deinterleave()
self.smartnet_crc = smartnet.crc(queue)
#rerate = float(self.rate / float(first_decim)) / float(7200)
#print "resampling factor: %f\n" % rerate
#if rerate.is_integer():
# print "using pfb decimator\n"
# self.resamp = blks2.pfb_decimator_ccf(int(rerate))
#else:
# print "using pfb resampler\n"
# self.resamp = blks2.pfb_arb_resampler_ccf(1 / rerate)
if options.filename is None:
#self.connect(self.u, self.demod)
self.connect(self.rtl, (self.mixer, 0))
self.connect(self.offset, (self.mixer, 1))
self.connect(self.mixer, self.demod)
# self.connect(self.rtl, self.demod)
else:
self.connect(self.fs, self.demod)
self.connect(self.demod, self.start_correlator, self.smartnet_deinterleave, self.smartnet_crc)
#hook up the audio patch
if options.audio:
self.audiorate = 48000
self.audiotaps = gr.firdes.low_pass(1, self.rate, 8000, 2000, gr.firdes.WIN_HANN)
self.prefilter_decim = int(self.rate / self.audiorate) #might have to use a rational resampler for audio
print "Prefilter decimation: %i" % self.prefilter_decim
self.audio_prefilter = gr.freq_xlating_fir_filter_ccf(self.prefilter_decim, #decimation
self.audiotaps, #taps
0, #freq offset
self.rate) #sampling rate
#on a trunked network where you know you will have good signal, a carrier power squelch works well. real FM receviers use a noise squelch, where
#the received audio is high-passed above the cutoff and then fed to a reverse squelch. If the power is then BELOW a threshold, open the squelch.
#self.squelch = gr.pwr_squelch_cc(options.squelch, #squelch point
# alpha = 0.1, #wat
# ramp = 10, #wat
# gate = False)
self.audiodemod = blks2.fm_demod_cf(self.rate/self.prefilter_decim, #rate
1, #audio decimation
4000, #deviation
3000, #audio passband
4000, #audio stopband
1, #gain
75e-6) #deemphasis constant
#the filtering removes FSK data woobling from the subaudible channel (might be able to combine w/lpf above)
self.audiofilttaps = gr.firdes.high_pass(1, self.audiorate, 300, 50, gr.firdes.WIN_HANN)
self.audiofilt = gr.fir_filter_fff(1, self.audiofilttaps)
self.audiogain = gr.multiply_const_ff(options.volume)
self.audiosink = audio.sink (self.audiorate, "")
# self.audiosink = gr.wavfile_sink("test.wav", 1, self.audiorate, 8)
#self.mute()
if options.filename is None:
#self.connect(self.u, self.audio_prefilter)
self.connect(self.rtl, self.audio_prefilter)
else:
self.connect(self.fs, self.audio_prefilter)
# self.connect(self.audio_prefilter, self.squelch, self.audiodemod, self.audiofilt, self.audiogain, self.audioresamp, self.audiosink)
# real self.connect(self.audio_prefilter, self.squelch, self.audiodemod, self.audiofilt, self.audiogain, self.audiosink)
self.connect(self.audio_prefilter, self.audiodemod, self.audiofilt, self.audiogain, self.audiosink)
def __init__(self, talkgroup, options):
gr.hier_block2.__init__(self, "fsk_demod",
gr.io_signature(1, 1, gr.sizeof_gr_complex), # Input signature
gr.io_signature(0, 0, gr.sizeof_char)) # Output signature
#print "Starting log_receiver init()"
self.audiorate = options.audiorate
self.rate = options.rate
self.talkgroup = talkgroup
self.directory = options.directory
if options.squelch is None:
options.squelch = 28
if options.volume is None:
options.volume = 3.0
self.audiotaps = gr.firdes.low_pass(1, self.rate, 8000, 2000, gr.firdes.WIN_HANN)
self.prefilter_decim = int(self.rate / self.audiorate)
#the audio prefilter is a channel selection filter.
self.audio_prefilter = gr.freq_xlating_fir_filter_ccf(self.prefilter_decim, #decimation
self.audiotaps, #taps
0, #freq offset
int(self.rate)) #sampling rate
#on a trunked network where you know you will have good signal, a carrier power squelch works well. real FM receviers use a noise squelch, where
#the received audio is high-passed above the cutoff and then fed to a reverse squelch. If the power is then BELOW a threshold, open the squelch.
self.squelch = gr.pwr_squelch_cc(options.squelch, #squelch point
alpha = 0.1, #wat
ramp = 10, #wat
gate = True) #gated so that the audio recording doesn't contain blank spaces between transmissions
self.audiodemod = blks2.fm_demod_cf(self.rate/self.prefilter_decim, #rate
1, #audio decimation
4000, #deviation
3000, #audio passband
4000, #audio stopband
options.volume, #gain
75e-6) #deemphasis constant
#the filtering removes FSK data woobling from the subaudible channel
self.audiofilttaps = gr.firdes.high_pass(1, self.audiorate, 300, 50, gr.firdes.WIN_HANN)
self.audiofilt = gr.fir_filter_fff(1, self.audiofilttaps)
#self.audiogain = gr.multiply_const_ff(options.volume)
#here we generate a random filename in the form /tmp/[random].wav, and then use it for the wavstamp block. this avoids collisions later on. remember to clean up these files when deallocating.
self.tmpfilename = "/tmp/%s.wav" % ("".join([random.choice(string.letters+string.digits) for x in range(8)])) #if this looks glaringly different, it's because i totally cribbed it from a blog.
self.valve = grc_blks2.valve(gr.sizeof_float, bool(1))
#self.prefiltervalve = grc_blks2.valve(gr.sizeof_gr_complex, bool(1))
#open the logfile for appending
self.timestampfilename = "%s/%i.txt" % (self.directory, self.talkgroup)
self.timestampfile = open(self.timestampfilename, 'a');
self.filename = "%s/%i.wav" % (self.directory, self.talkgroup)
self.audiosink = smartnet.wavsink(self.filename, 1, self.audiorate, 8) #this version allows appending to existing files.
# self.connect(self, self.audio_prefilter, self.squelch, self.audiodemod, self.valve, self.audiofilt, self.audiosink)
self.connect(self, self.audio_prefilter, self.audiodemod, self.valve, self.audiofilt, self.audiosink)
self.timestamp = 0.0
#print "Finishing logging receiver init()."
self.mute() #start off muted.
def __init__(self, talkgroup, options):
gr.hier_block2.__init__(self, "fsk_demod",
gr.io_signature(1, 1, gr.sizeof_gr_complex), # Input signature
gr.io_signature(0, 0, gr.sizeof_char)) # Output signature
print "Starting log_receiver init()"
self.samp_rate = samp_rate = int(options.rate)
self.samp_per_sym = samp_per_sym = 10
self.decim = decim = 20
self.xlate_bandwidth = xlate_bandwidth = 24260.0
self.xlate_offset = xlate_offset = 0
self.channel_rate = channel_rate = op25.SYMBOL_RATE*samp_per_sym
self.audio_mul = audio_mul = 1
self.pre_channel_rate = pre_channel_rate = int(samp_rate/decim)
self.squelch = squelch = -55
self.auto_tune_offset = auto_tune_offset = 0
self.audiorate = 44100 #options.audiorate
self.rate = options.rate
self.talkgroup = talkgroup
self.directory = options.directory
if options.squelch is None:
options.squelch = 28
if options.volume is None:
options.volume = 3.0
##################################################
# Blocks
##################################################
print "Setting up Blocks"
self.audiotaps = gr.firdes.low_pass(1, samp_rate, 8000, 2000, gr.firdes.WIN_HANN)
self.prefilter_decim = int(self.rate / self.audiorate)
#the audio prefilter is a channel selection filter.
self.audio_prefilter = gr.freq_xlating_fir_filter_ccf(self.prefilter_decim, #decimation
self.audiotaps, #taps
0, #freq offset
int(samp_rate)) #sampling rate
self.audiodemod = blks2.fm_demod_cf(self.rate/self.prefilter_decim, #rate
1, #audio decimation
4000, #deviation
3000, #audio passband
4000, #audio stopband
options.volume, #gain
75e-6) #deemphasis constant
#the filtering removes FSK data woobling from the subaudible channel
self.audiofilttaps = gr.firdes.high_pass(1, self.audiorate, 300, 50, gr.firdes.WIN_HANN)
self.audiofilt = gr.fir_filter_fff(1, self.audiofilttaps)
self.gr_quadrature_demod_cf_0 = analog.quadrature_demod_cf(1.6) #(channel_rate/(2.0 * math.pi * op25.SYMBOL_DEVIATION)))
self.gr_freq_xlating_fir_filter_xxx_0 = filter.freq_xlating_fir_filter_ccc(decim,
(firdes.low_pass(1, samp_rate, xlate_bandwidth/2, 2000)),
0,
samp_rate)
self.gr_fir_filter_xxx_0 = filter.fir_filter_fff(1, ((1.0/samp_per_sym,)*samp_per_sym))
self.blocks_multiply_const_vxx_0 = blocks.multiply_const_vff((10.**(audio_mul/10.), ))
self.blks2_rational_resampler_xxx_1 = blks2.rational_resampler_ccc(
interpolation=channel_rate,
decimation=pre_channel_rate,
taps=None,
fractional_bw=None,
)
self.blks2_rational_resampler_xxx_0 = blks2.rational_resampler_fff(
interpolation=self.audiorate,
decimation=8000,
taps=None,
fractional_bw=None,
)
#here we generate a random filename in the form /tmp/[random].wav, and then use it for the wavstamp block. this avoids collisions later on. remember to clean up these files when deallocating.
self.tmpfilename = "/tmp/%s.wav" % ("".join([random.choice(string.letters+string.digits) for x in range(8)])) #if this looks glaringly different, it's because i totally cribbed it from a blog.
self.valve = grc_blks2.valve(gr.sizeof_float, bool(1))
self.dsd_block_ff_0 = dsd.block_ff(dsd.dsd_FRAME_AUTO_DETECT,dsd.dsd_MOD_AUTO_SELECT,3,2,True)
#open the logfile for appending
self.timestampfilename = "%s/%i.txt" % (self.directory, self.talkgroup)
self.timestampfile = open(self.timestampfilename, 'a');
self.filename = "%s/%i.wav" % (self.directory, self.talkgroup)
self.audiosink = smartnet.wavsink(self.filename, 1, self.audiorate, 8) #blocks.wavfile_sink(self.filename, 1, self.audiorate, 8) this version allows appending to existing files.
self.audio_sink_0 = audio.sink(44100, "", True)
self.timestamp = 0.0
#print "Finishing logging receiver init()."
self.mute() #start off muted.
print "Connecting blocks"
##################################################
# Connections
##################################################
self.connect(self.blks2_rational_resampler_xxx_0, self.blocks_multiply_const_vxx_0)
self.connect(self.gr_fir_filter_xxx_0 , self.valve, self.dsd_block_ff_0)
self.connect(self.dsd_block_ff_0, self.blks2_rational_resampler_xxx_0)
## Start
self.connect(self, self.gr_freq_xlating_fir_filter_xxx_0, self.blks2_rational_resampler_xxx_1, self.gr_quadrature_demod_cf_0, self.gr_fir_filter_xxx_0)
## End
# self.connect(self.blocks_multiply_const_vxx_0, self.audio_sink_0) # Plays the audio
self.connect(self.blocks_multiply_const_vxx_0, self.audiosink) # Records the audio
