def __init__(self, frame, panel, vbox, argv):
stdgui2.std_top_block.__init__(self, frame, panel, vbox, argv)
parser = OptionParser(option_class=eng_option)
parser.add_option("-a",
"--args",
type="string",
default="",
help="UHD device address args [default=%default]")
parser.add_option("",
"--spec",
type="string",
default=None,
help="Subdevice of UHD device where appropriate")
parser.add_option("-A",
"--antenna",
type="string",
default=None,
help="select Rx Antenna where appropriate")
parser.add_option("-f",
"--freq",
type="eng_float",
default=100.1e6,
help="set frequency to FREQ",
metavar="FREQ")
parser.add_option("-g",
"--gain",
type="eng_float",
default=40,
help="set gain in dB (default is midpoint)")
parser.add_option("-V",
"--volume",
type="eng_float",
default=None,
help="set volume (default is midpoint)")
parser.add_option(
"-O",
"--audio-output",
type="string",
default="",
help="pcm device name. E.g., hw:0,0 or surround51 or /dev/dsp")
parser.add_option("",
"--freq-min",
type="eng_float",
default=87.9e6,
help="Set a minimum frequency [default=%default]")
parser.add_option("",
"--freq-max",
type="eng_float",
default=108.1e6,
help="Set a maximum frequency [default=%default]")
(options, args) = parser.parse_args()
if len(args) != 0:
parser.print_help()
sys.exit(1)
self.frame = frame
self.panel = panel
self.vol = 0
self.state = "FREQ"
self.freq = 0
self.fm_freq_min = options.freq_min
self.fm_freq_max = options.freq_max
# build graph
self.u = uhd.usrp_source(device_addr=options.args,
stream_args=uhd.stream_args('fc32'))
# Set the subdevice spec
if (options.spec):
self.u.set_subdev_spec(options.spec, 0)
# Set the antenna
if (options.antenna):
self.u.set_antenna(options.antenna, 0)
usrp_rate = 320e3
demod_rate = 320e3
audio_rate = 32e3
sca_demod_rate = 64e3
audio_decim = int(demod_rate / audio_rate)
sca_chanfilt_decim = int(demod_rate / sca_demod_rate)
self.u.set_samp_rate(usrp_rate)
dev_rate = self.u.get_samp_rate()
nfilts = 32
chan_coeffs = optfir.low_pass(
nfilts, # gain
nfilts * usrp_rate, # sampling rate
100e3, # passband cutoff
140e3, # stopband cutoff
0.1, # passband ripple
60) # stopband attenuation
rrate = usrp_rate / dev_rate
self.chan_filt = blks2.pfb_arb_resampler_ccf(rrate, chan_coeffs,
nfilts)
#Create demodulator block for Main FM Channel
max_dev = 75e3
fm_demod_gain = demod_rate / (2 * math.pi * max_dev)
self.fm_demod = gr.quadrature_demod_cf(fm_demod_gain)
# Note - deemphasis is not applied to the Main FM Channel as
# main audio is not decoded
# SCA Devation is 10% of carrier but some references say 20%
# if mono with one SCA (6 KHz seems typical)
max_sca_dev = 6e3
# Create filter to get SCA channel we want
sca_chan_coeffs = gr.firdes.low_pass(
1.0, # gain
demod_rate, # sampling rate
max_sca_dev, # cutoff freq
max_sca_dev / 3, # trans. band
gr.firdes.WIN_HANN) # filter type
self.ddc = gr.freq_xlating_fir_filter_fcf(
sca_chanfilt_decim, # decim rate
sca_chan_coeffs, # taps
0, # freq translation amount (Gets set by the UI)
demod_rate) # input sample rate
#Create demodulator block for SCA Channel
sca_demod_gain = sca_demod_rate / (2 * math.pi * max_sca_dev)
self.fm_demod_sca = gr.quadrature_demod_cf(sca_demod_gain)
# SCA analog audio is bandwidth limited to 5 KHz
max_sca_audio_freq = 5.0e3
# SCA analog deephasis is 150 uS (75 uS may be used)
sca_tau = 150e-6
# compute FIR filter taps for SCA audio filter
audio_coeffs = gr.firdes.low_pass(
1.0, # gain
sca_demod_rate, # sampling rate
max_sca_audio_freq, # cutoff freq
max_sca_audio_freq / 2.5, # trans. band
gr.firdes.WIN_HAMMING)
# input: float; output: float
self.audio_filter = gr.fir_filter_fff(audio_decim, audio_coeffs)
# Create deemphasis block that is applied after SCA demodulation
self.deemph = blks2.fm_deemph(audio_rate, sca_tau)
self.volume_control = gr.multiply_const_ff(self.vol)
# sound card as final sink
self.audio_sink = audio.sink(int(audio_rate), options.audio_output,
False) # ok_to_block
# now wire it all together
self.connect(self.u, self.chan_filt, self.fm_demod, self.ddc,
self.fm_demod_sca)
self.connect(self.fm_demod_sca, self.audio_filter, self.deemph,
self.volume_control, self.audio_sink)
self._build_gui(vbox, usrp_rate, demod_rate, sca_demod_rate,
audio_rate)
if options.gain is None:
# if no gain was specified, use the mid-point in dB
g = self.u.get_gain_range()
options.gain = float(g.start() + g.stop()) / 2
if options.volume is None:
g = self.volume_range()
options.volume = float(g[0] + g[1]) / 2
frange = self.u.get_freq_range()
if (frange.start() > self.fm_freq_max
or frange.stop() < self.fm_freq_min):
sys.stderr.write(
"Radio does not support required frequency range.\n")
sys.exit(1)
if (options.freq < self.fm_freq_min
or options.freq > self.fm_freq_max):
sys.stderr.write(
"Requested frequency is outside of required frequency range.\n"
)
sys.exit(1)
# set initial values
self.set_gain(options.gain)
self.set_vol(options.volume)
if not (self.set_freq(options.freq)):
self._set_status_msg("Failed to set initial frequency")
self.set_sca_freq(67000) # A common SCA Frequency
def __init__(self,frame,panel,vbox,argv):
stdgui2.std_top_block.__init__ (self,frame,panel,vbox,argv)
parser=OptionParser(option_class=eng_option)
parser.add_option("-a", "--args", type="string", default="",
help="UHD device address args [default=%default]")
parser.add_option("", "--spec", type="string", default=None,
help="Subdevice of UHD device where appropriate")
parser.add_option("-A", "--antenna", type="string", default=None,
help="select Rx Antenna where appropriate")
parser.add_option("-f", "--freq", type="eng_float", default=100.1e6,
help="set frequency to FREQ", metavar="FREQ")
parser.add_option("-g", "--gain", type="eng_float", default=None,
help="set gain in dB (default is midpoint)")
parser.add_option("-V", "--volume", type="eng_float", default=None,
help="set volume (default is midpoint)")
parser.add_option("-O", "--audio-output", type="string", default="default",
help="pcm device name. E.g., hw:0,0 or surround51 or /dev/dsp")
parser.add_option("", "--freq-min", type="eng_float", default=87.9e6,
help="Set a minimum frequency [default=%default]")
parser.add_option("", "--freq-max", type="eng_float", default=108.1e6,
help="Set a maximum frequency [default=%default]")
(options, args) = parser.parse_args()
if len(args) != 0:
parser.print_help()
sys.exit(1)
self.frame = frame
self.panel = panel
self.vol = 0
self.state = "FREQ"
self.freq = 0
self.fm_freq_min = options.freq_min
self.fm_freq_max = options.freq_max
# build graph
self.u = uhd.usrp_source(device_addr=options.args, stream_args=uhd.stream_args('fc32'))
# Set the subdevice spec
if(options.spec):
self.u.set_subdev_spec(options.spec, 0)
# Set the antenna
if(options.antenna):
self.u.set_antenna(options.antenna, 0)
usrp_rate = 320e3
demod_rate = 320e3
audio_rate = 32e3
sca_demod_rate = 64e3
audio_decim = int(demod_rate / audio_rate)
sca_chanfilt_decim = int(demod_rate / sca_demod_rate)
self.u.set_samp_rate(usrp_rate)
dev_rate = self.u.get_samp_rate()
nfilts = 32
chan_coeffs = optfir.low_pass (nfilts, # gain
nfilts*usrp_rate, # sampling rate
100e3, # passband cutoff
140e3, # stopband cutoff
0.1, # passband ripple
60) # stopband attenuation
rrate = usrp_rate / dev_rate
self.chan_filt = blks2.pfb_arb_resampler_ccf(rrate, chan_coeffs, nfilts)
#Create demodulator block for Main FM Channel
max_dev = 75e3
fm_demod_gain = demod_rate/(2*math.pi*max_dev)
self.fm_demod = gr.quadrature_demod_cf (fm_demod_gain)
# Note - deemphasis is not applied to the Main FM Channel as
# main audio is not decoded
# SCA Devation is 10% of carrier but some references say 20%
# if mono with one SCA (6 KHz seems typical)
max_sca_dev = 6e3
# Create filter to get SCA channel we want
sca_chan_coeffs = gr.firdes.low_pass (1.0, # gain
demod_rate, # sampling rate
max_sca_dev, # cutoff freq
max_sca_dev/3, # trans. band
gr.firdes.WIN_HANN) # filter type
self.ddc = gr.freq_xlating_fir_filter_fcf(sca_chanfilt_decim, # decim rate
sca_chan_coeffs, # taps
0, # freq translation amount (Gets set by the UI)
demod_rate) # input sample rate
#Create demodulator block for SCA Channel
sca_demod_gain = sca_demod_rate/(2*math.pi*max_sca_dev)
self.fm_demod_sca = gr.quadrature_demod_cf (sca_demod_gain)
# SCA analog audio is bandwidth limited to 5 KHz
max_sca_audio_freq = 5.0e3
# SCA analog deephasis is 150 uS (75 uS may be used)
sca_tau = 150e-6
# compute FIR filter taps for SCA audio filter
audio_coeffs = gr.firdes.low_pass (1.0, # gain
sca_demod_rate, # sampling rate
max_sca_audio_freq, # cutoff freq
max_sca_audio_freq/2.5, # trans. band
gr.firdes.WIN_HAMMING)
# input: float; output: float
self.audio_filter = gr.fir_filter_fff (audio_decim, audio_coeffs)
# Create deemphasis block that is applied after SCA demodulation
self.deemph = blks2.fm_deemph (audio_rate, sca_tau)
self.volume_control = gr.multiply_const_ff(self.vol)
# sound card as final sink
self.audio_sink = audio.sink (int (audio_rate),
options.audio_output,
False) # ok_to_block
# now wire it all together
self.connect (self.u, self.chan_filt, self.fm_demod,
self.ddc, self.fm_demod_sca)
self.connect (self.fm_demod_sca, self.audio_filter,
self.deemph, self.volume_control,
self.audio_sink)
self._build_gui(vbox, usrp_rate, demod_rate, sca_demod_rate, audio_rate)
if options.gain is None:
# if no gain was specified, use the mid-point in dB
g = self.u.get_gain_range()
options.gain = float(g.start()+g.stop())/2
if options.volume is None:
g = self.volume_range()
options.volume = float(g[0]+g[1])/2
frange = self.u.get_freq_range()
if(frange.start() > self.fm_freq_max or frange.stop() < self.fm_freq_min):
sys.stderr.write("Radio does not support required frequency range.\n")
sys.exit(1)
if(options.freq < self.fm_freq_min or options.freq > self.fm_freq_max):
sys.stderr.write("Requested frequency is outside of required frequency range.\n")
sys.exit(1)
# set initial values
self.set_gain(options.gain)
self.set_vol(options.volume)
if not(self.set_freq(options.freq)):
self._set_status_msg("Failed to set initial frequency")
self.set_sca_freq(67000) # A common SCA Frequency
def __init__(self,frame,panel,vbox,argv):
stdgui2.std_top_block.__init__ (self,frame,panel,vbox,argv)
parser=OptionParser(option_class=eng_option)
parser.add_option("-R", "--rx-subdev-spec", type="subdev", default=None,
help="select USRP Rx side A or B (default=A)")
parser.add_option("-f", "--freq", type="eng_float", default=100.1e6,
help="set frequency to FREQ", metavar="FREQ")
parser.add_option("-g", "--gain", type="eng_float", default=40,
help="set gain in dB (default is midpoint)")
parser.add_option("-V", "--volume", type="eng_float", default=None,
help="set volume (default is midpoint)")
parser.add_option("-O", "--audio-output", type="string", default="",
help="pcm device name. E.g., hw:0,0 or surround51 or /dev/dsp")
(options, args) = parser.parse_args()
if len(args) != 0:
parser.print_help()
sys.exit(1)
self.frame = frame
self.panel = panel
self.vol = 0
self.state = "FREQ"
self.freq = 0
# build graph
self.u = usrp.source_c() # usrp is data source
adc_rate = self.u.adc_rate() # 64 MS/s
usrp_decim = 200
self.u.set_decim_rate(usrp_decim)
usrp_rate = adc_rate / usrp_decim # 320 kS/s
chanfilt_decim = 1
demod_rate = usrp_rate / chanfilt_decim
sca_chanfilt_decim = 5
sca_demod_rate = demod_rate / sca_chanfilt_decim #64 kHz
audio_decimation = 2
audio_rate = sca_demod_rate / audio_decimation # 32 kHz
if options.rx_subdev_spec is None:
options.rx_subdev_spec = pick_subdevice(self.u)
self.u.set_mux(usrp.determine_rx_mux_value(self.u, options.rx_subdev_spec))
self.subdev = usrp.selected_subdev(self.u, options.rx_subdev_spec)
print "Using RX d'board %s" % (self.subdev.side_and_name(),)
#Create filter to get main FM Channel we want
chan_filt_coeffs = optfir.low_pass (1, # gain
usrp_rate, # sampling rate
100e3, # passband cutoff
140e3, # stopband cutoff
0.1, # passband ripple
60) # stopband attenuation
#print len(chan_filt_coeffs)
chan_filt = gr.fir_filter_ccf (chanfilt_decim, chan_filt_coeffs)
#Create demodulator block for Main FM Channel
max_dev = 75e3
fm_demod_gain = demod_rate/(2*math.pi*max_dev)
self.fm_demod = gr.quadrature_demod_cf (fm_demod_gain)
# Note - deemphasis is not applied to the Main FM Channel as main audio is not decoded
# SCA Devation is 10% of carrier but some references say 20% if mono with one SCA (6 KHz seems typical)
max_sca_dev = 6e3
# Create filter to get SCA channel we want
sca_chan_coeffs = gr.firdes.low_pass (1.0, # gain
demod_rate, # sampling rate
max_sca_dev, # low pass cutoff freq
max_sca_dev/3, # width of trans. band
gr.firdes.WIN_HANN) # filter type
self.ddc = gr.freq_xlating_fir_filter_fcf(sca_chanfilt_decim, # decimation rate
sca_chan_coeffs, # taps
0, # frequency translation amount (Gets set by the UI)
demod_rate) # input sample rate
#Create demodulator block for SCA Channel
sca_demod_gain = sca_demod_rate/(2*math.pi*max_sca_dev)
self.fm_demod_sca = gr.quadrature_demod_cf (sca_demod_gain)
# SCA analog audio is bandwidth limited to 5 KHz
max_sca_audio_freq = 5.0e3
# SCA analog deephasis is 150 uS (75 uS may be used)
sca_tau = 150e-6
# compute FIR filter taps for SCA audio filter
audio_coeffs = gr.firdes.low_pass (1.0, # gain
sca_demod_rate, # sampling rate
max_sca_audio_freq, # low pass cutoff freq
max_sca_audio_freq/2.5, # width of trans. band
gr.firdes.WIN_HAMMING)
# input: float; output: float
self.audio_filter = gr.fir_filter_fff (audio_decimation, audio_coeffs)
# Create deemphasis block that is applied after SCA demodulation
self.deemph = fm_deemph (audio_rate, sca_tau)
self.volume_control = gr.multiply_const_ff(self.vol)
# sound card as final sink
audio_sink = audio.sink (int (audio_rate),
options.audio_output,
False) # ok_to_block
# now wire it all together
self.connect (self.u, chan_filt, self.fm_demod, self.ddc, self.fm_demod_sca)
self.connect (self.fm_demod_sca, self.audio_filter, self.deemph, self.volume_control, audio_sink)
self._build_gui(vbox, usrp_rate, demod_rate, sca_demod_rate, audio_rate)
if options.gain is None:
# if no gain was specified, use the mid-point in dB
g = self.subdev.gain_range()
options.gain = float(g[0]+g[1])/2
if options.volume is None:
g = self.volume_range()
options.volume = float(g[0]+g[1])/2
if abs(options.freq) < 1e6:
options.freq *= 1e6
# set initial values
self.set_gain(options.gain)
self.set_vol(options.volume)
if not(self.set_freq(options.freq)):
self._set_status_msg("Failed to set initial frequency")
self.set_sca_freq(67000) # A common SCA Frequency
