def __init__(self, *args, **kwds):
# begin wxGlade: MyFrame.__init__
kwds["style"] = wx.DEFAULT_FRAME_STYLE
wx.Frame.__init__(self, *args, **kwds)
# Menu Bar
self.frame_1_menubar = wx.MenuBar()
self.SetMenuBar(self.frame_1_menubar)
wxglade_tmp_menu = wx.Menu()
self.Exit = wx.MenuItem(wxglade_tmp_menu, ID_EXIT, "Exit", "Exit",
wx.ITEM_NORMAL)
wxglade_tmp_menu.AppendItem(self.Exit)
self.frame_1_menubar.Append(wxglade_tmp_menu, "File")
# Menu Bar end
self.panel_1 = wx.Panel(self, -1)
self.button_1 = wx.Button(self, ID_BUTTON_1, "LSB")
self.button_2 = wx.Button(self, ID_BUTTON_2, "USB")
self.button_3 = wx.Button(self, ID_BUTTON_3, "AM")
self.button_4 = wx.Button(self, ID_BUTTON_4, "CW")
self.button_5 = wx.ToggleButton(self, ID_BUTTON_5, "Upper")
self.slider_fcutoff_hi = wx.Slider(self,
ID_SLIDER_1,
0,
-15798,
15799,
style=wx.SL_HORIZONTAL
| wx.SL_LABELS)
self.button_6 = wx.ToggleButton(self, ID_BUTTON_6, "Lower")
self.slider_fcutoff_lo = wx.Slider(self,
ID_SLIDER_2,
0,
-15799,
15798,
style=wx.SL_HORIZONTAL
| wx.SL_LABELS)
self.panel_5 = wx.Panel(self, -1)
self.label_1 = wx.StaticText(self, -1, " Band\nCenter")
self.text_ctrl_1 = wx.TextCtrl(self, ID_TEXT_1, "")
self.panel_6 = wx.Panel(self, -1)
self.panel_7 = wx.Panel(self, -1)
self.panel_2 = wx.Panel(self, -1)
self.button_7 = wx.ToggleButton(self, ID_BUTTON_7, "Freq")
self.slider_3 = wx.Slider(self, ID_SLIDER_3, 3000, 0, 6000)
self.spin_ctrl_1 = wx.SpinCtrl(self, ID_SPIN_1, "", min=0, max=100)
self.button_8 = wx.ToggleButton(self, ID_BUTTON_8, "Vol")
self.slider_4 = wx.Slider(self, ID_SLIDER_4, 0, 0, 500)
self.slider_5 = wx.Slider(self, ID_SLIDER_5, 0, 0, 20)
self.button_9 = wx.ToggleButton(self, ID_BUTTON_9, "Time")
self.button_11 = wx.Button(self, ID_BUTTON_11, "Rew")
self.button_10 = wx.Button(self, ID_BUTTON_10, "Fwd")
self.panel_3 = wx.Panel(self, -1)
self.label_2 = wx.StaticText(self, -1, "PGA ")
self.panel_4 = wx.Panel(self, -1)
self.panel_8 = wx.Panel(self, -1)
self.panel_9 = wx.Panel(self, -1)
self.label_3 = wx.StaticText(self, -1, "AM Sync\nCarrier")
self.slider_6 = wx.Slider(self,
ID_SLIDER_6,
50,
0,
200,
style=wx.SL_HORIZONTAL | wx.SL_LABELS)
self.label_4 = wx.StaticText(self, -1, "Antenna Tune")
self.slider_7 = wx.Slider(self,
ID_SLIDER_7,
1575,
950,
2200,
style=wx.SL_HORIZONTAL | wx.SL_LABELS)
self.panel_10 = wx.Panel(self, -1)
self.button_12 = wx.ToggleButton(self, ID_BUTTON_12, "Auto Tune")
self.button_13 = wx.Button(self, ID_BUTTON_13, "Calibrate")
self.button_14 = wx.Button(self, ID_BUTTON_14, "Reset")
self.panel_11 = wx.Panel(self, -1)
self.panel_12 = wx.Panel(self, -1)
self.__set_properties()
self.__do_layout()
# end wxGlade
parser = OptionParser(option_class=eng_option)
parser.add_option("",
"--address",
type="string",
default="addr=192.168.10.2",
help="Address of UHD device, [default=%default]")
parser.add_option("-c",
"--ddc-freq",
type="eng_float",
default=3.9e6,
help="set Rx DDC frequency to FREQ",
metavar="FREQ")
parser.add_option(
"-s",
"--samp-rate",
type="eng_float",
default=256e3,
help="set sample rate (bandwidth) [default=%default]")
parser.add_option("-a",
"--audio_file",
default="",
help="audio output file",
metavar="FILE")
parser.add_option("-r",
"--radio_file",
default="",
help="radio output file",
metavar="FILE")
parser.add_option("-i",
"--input_file",
default="",
help="radio input file",
metavar="FILE")
parser.add_option(
"-O",
"--audio-output",
type="string",
default="",
help="audio output device name. E.g., hw:0,0, /dev/dsp, or pulse")
(options, args) = parser.parse_args()
self.usrp_center = options.ddc_freq
input_rate = options.samp_rate
self.slider_range = input_rate * 0.9375
self.f_lo = self.usrp_center - (self.slider_range / 2)
self.f_hi = self.usrp_center + (self.slider_range / 2)
self.af_sample_rate = 32000
fir_decim = long(input_rate / self.af_sample_rate)
# data point arrays for antenna tuner
self.xdata = []
self.ydata = []
self.tb = gr.top_block()
# radio variables, initial conditions
self.frequency = self.usrp_center
# these map the frequency slider (0-6000) to the actual range
self.f_slider_offset = self.f_lo
self.f_slider_scale = 10000
self.spin_ctrl_1.SetRange(self.f_lo, self.f_hi)
self.text_ctrl_1.SetValue(str(int(self.usrp_center)))
self.slider_5.SetValue(0)
self.AM_mode = False
self.slider_3.SetValue(
(self.frequency - self.f_slider_offset) / self.f_slider_scale)
self.spin_ctrl_1.SetValue(int(self.frequency))
POWERMATE = True
try:
self.pm = powermate.powermate(self)
except:
sys.stderr.write("Unable to find PowerMate or Contour Shuttle\n")
POWERMATE = False
if POWERMATE:
powermate.EVT_POWERMATE_ROTATE(self, self.on_rotate)
powermate.EVT_POWERMATE_BUTTON(self, self.on_pmButton)
self.active_button = 7
# command line options
if options.audio_file == "": SAVE_AUDIO_TO_FILE = False
else: SAVE_AUDIO_TO_FILE = True
if options.radio_file == "": SAVE_RADIO_TO_FILE = False
else: SAVE_RADIO_TO_FILE = True
if options.input_file == "": self.PLAY_FROM_USRP = True
else: self.PLAY_FROM_USRP = False
if self.PLAY_FROM_USRP:
self.src = uhd.usrp_source(device_addr=options.address,
io_type=uhd.io_type.COMPLEX_FLOAT32,
num_channels=1)
self.src.set_samp_rate(input_rate)
input_rate = self.src.get_samp_rate()
self.src.set_center_freq(self.usrp_center, 0)
self.tune_offset = 0
else:
self.src = gr.file_source(gr.sizeof_short, options.input_file)
self.tune_offset = 2200 # 2200 works for 3.5-4Mhz band
# convert rf data in interleaved short int form to complex
s2ss = gr.stream_to_streams(gr.sizeof_short, 2)
s2f1 = gr.short_to_float()
s2f2 = gr.short_to_float()
src_f2c = gr.float_to_complex()
self.tb.connect(self.src, s2ss)
self.tb.connect((s2ss, 0), s2f1)
self.tb.connect((s2ss, 1), s2f2)
self.tb.connect(s2f1, (src_f2c, 0))
self.tb.connect(s2f2, (src_f2c, 1))
# save radio data to a file
if SAVE_RADIO_TO_FILE:
radio_file = gr.file_sink(gr.sizeof_short, options.radio_file)
self.tb.connect(self.src, radio_file)
# 2nd DDC
xlate_taps = gr.firdes.low_pass ( \
1.0, input_rate, 16e3, 4e3, gr.firdes.WIN_HAMMING )
self.xlate = gr.freq_xlating_fir_filter_ccf ( \
fir_decim, xlate_taps, self.tune_offset, input_rate )
# Complex Audio filter
audio_coeffs = gr.firdes.complex_band_pass(
1.0, # gain
self.af_sample_rate, # sample rate
-3000, # low cutoff
0, # high cutoff
100, # transition
gr.firdes.WIN_HAMMING) # window
self.slider_fcutoff_hi.SetValue(0)
self.slider_fcutoff_lo.SetValue(-3000)
self.audio_filter = gr.fir_filter_ccc(1, audio_coeffs)
# Main +/- 16Khz spectrum display
self.fft = fftsink2.fft_sink_c(self.panel_2,
fft_size=512,
sample_rate=self.af_sample_rate,
average=True,
size=(640, 240))
# AM Sync carrier
if AM_SYNC_DISPLAY:
self.fft2 = fftsink.fft_sink_c(self.tb,
self.panel_9,
y_per_div=20,
fft_size=512,
sample_rate=self.af_sample_rate,
average=True,
size=(640, 240))
c2f = gr.complex_to_float()
# AM branch
self.sel_am = gr.multiply_const_cc(0)
# the following frequencies turn out to be in radians/sample
# gr.pll_refout_cc(alpha,beta,min_freq,max_freq)
# suggested alpha = X, beta = .25 * X * X
pll = gr.pll_refout_cc(.5, .0625,
(2. * math.pi * 7.5e3 / self.af_sample_rate),
(2. * math.pi * 6.5e3 / self.af_sample_rate))
self.pll_carrier_scale = gr.multiply_const_cc(complex(10, 0))
am_det = gr.multiply_cc()
# these are for converting +7.5kHz to -7.5kHz
# for some reason gr.conjugate_cc() adds noise ??
c2f2 = gr.complex_to_float()
c2f3 = gr.complex_to_float()
f2c = gr.float_to_complex()
phaser1 = gr.multiply_const_ff(1)
phaser2 = gr.multiply_const_ff(-1)
# filter for pll generated carrier
pll_carrier_coeffs = gr.firdes.complex_band_pass(
2.0, # gain
self.af_sample_rate, # sample rate
7400, # low cutoff
7600, # high cutoff
100, # transition
gr.firdes.WIN_HAMMING) # window
self.pll_carrier_filter = gr.fir_filter_ccc(1, pll_carrier_coeffs)
self.sel_sb = gr.multiply_const_ff(1)
combine = gr.add_ff()
#AGC
sqr1 = gr.multiply_ff()
intr = gr.iir_filter_ffd([.004, 0], [0, .999])
offset = gr.add_const_ff(1)
agc = gr.divide_ff()
self.scale = gr.multiply_const_ff(0.00001)
dst = audio.sink(long(self.af_sample_rate), options.audio_output)
if self.PLAY_FROM_USRP:
self.tb.connect(self.src, self.xlate, self.fft)
else:
self.tb.connect(src_f2c, self.xlate, self.fft)
self.tb.connect(self.xlate, self.audio_filter, self.sel_am,
(am_det, 0))
self.tb.connect(self.sel_am, pll, self.pll_carrier_scale,
self.pll_carrier_filter, c2f3)
self.tb.connect((c2f3, 0), phaser1, (f2c, 0))
self.tb.connect((c2f3, 1), phaser2, (f2c, 1))
self.tb.connect(f2c, (am_det, 1))
self.tb.connect(am_det, c2f2, (combine, 0))
self.tb.connect(self.audio_filter, c2f, self.sel_sb, (combine, 1))
if AM_SYNC_DISPLAY:
self.tb.connect(self.pll_carrier_filter, self.fft2)
self.tb.connect(combine, self.scale)
self.tb.connect(self.scale, (sqr1, 0))
self.tb.connect(self.scale, (sqr1, 1))
self.tb.connect(sqr1, intr, offset, (agc, 1))
self.tb.connect(self.scale, (agc, 0))
self.tb.connect(agc, dst)
if SAVE_AUDIO_TO_FILE:
f_out = gr.file_sink(gr.sizeof_short, options.audio_file)
sc1 = gr.multiply_const_ff(64000)
f2s1 = gr.float_to_short()
self.tb.connect(agc, sc1, f2s1, f_out)
self.tb.start()
# for mouse position reporting on fft display
self.fft.win.Bind(wx.EVT_LEFT_UP, self.Mouse)
# and left click to re-tune
self.fft.win.Bind(wx.EVT_LEFT_DOWN, self.Click)
# start a timer to check for web commands
if WEB_CONTROL:
self.timer = UpdateTimer(self, 1000) # every 1000 mSec, 1 Sec
wx.EVT_BUTTON(self, ID_BUTTON_1, self.set_lsb)
wx.EVT_BUTTON(self, ID_BUTTON_2, self.set_usb)
wx.EVT_BUTTON(self, ID_BUTTON_3, self.set_am)
wx.EVT_BUTTON(self, ID_BUTTON_4, self.set_cw)
wx.EVT_BUTTON(self, ID_BUTTON_10, self.fwd)
wx.EVT_BUTTON(self, ID_BUTTON_11, self.rew)
wx.EVT_BUTTON(self, ID_BUTTON_13, self.AT_calibrate)
wx.EVT_BUTTON(self, ID_BUTTON_14, self.AT_reset)
wx.EVT_TOGGLEBUTTON(self, ID_BUTTON_5, self.on_button)
wx.EVT_TOGGLEBUTTON(self, ID_BUTTON_6, self.on_button)
wx.EVT_TOGGLEBUTTON(self, ID_BUTTON_7, self.on_button)
wx.EVT_TOGGLEBUTTON(self, ID_BUTTON_8, self.on_button)
wx.EVT_TOGGLEBUTTON(self, ID_BUTTON_9, self.on_button)
wx.EVT_SLIDER(self, ID_SLIDER_1, self.set_filter)
wx.EVT_SLIDER(self, ID_SLIDER_2, self.set_filter)
wx.EVT_SLIDER(self, ID_SLIDER_3, self.slide_tune)
wx.EVT_SLIDER(self, ID_SLIDER_4, self.set_volume)
wx.EVT_SLIDER(self, ID_SLIDER_5, self.set_pga)
wx.EVT_SLIDER(self, ID_SLIDER_6, self.am_carrier)
wx.EVT_SLIDER(self, ID_SLIDER_7, self.antenna_tune)
wx.EVT_SPINCTRL(self, ID_SPIN_1, self.spin_tune)
wx.EVT_MENU(self, ID_EXIT, self.TimeToQuit)
def __init__(self, demod_rate, audio_decimation):
"""
Hierarchical block for demodulating a broadcast FM signal.
The input is the downconverted complex baseband signal
(gr_complex). The output is two streams of the demodulated
audio (float) 0=Left, 1=Right.
@param demod_rate: input sample rate of complex baseband input.
@type demod_rate: float
@param audio_decimation: how much to decimate demod_rate to get to audio.
@type audio_decimation: integer
"""
gr.hier_block2.__init__(
self,
"wfm_rcv_fmdet",
gr.io_signature(1, 1, gr.sizeof_gr_complex), # Input signature
gr.io_signature(2, 2, gr.sizeof_float)) # Output signature
lowfreq = -125e3 / demod_rate
highfreq = 125e3 / demod_rate
audio_rate = demod_rate / audio_decimation
# We assign to self so that outsiders can grab the demodulator
# if they need to. E.g., to plot its output.
#
# input: complex; output: float
self.fm_demod = gr.fmdet_cf(demod_rate, lowfreq, highfreq, 0.05)
# input: float; output: float
self.deemph_Left = fm_deemph(audio_rate)
self.deemph_Right = fm_deemph(audio_rate)
# compute FIR filter taps for audio filter
width_of_transition_band = audio_rate / 32
audio_coeffs = gr.firdes.low_pass(
1.0, # gain
demod_rate, # sampling rate
15000,
width_of_transition_band,
gr.firdes.WIN_HAMMING)
# input: float; output: float
self.audio_filter = gr.fir_filter_fff(audio_decimation, audio_coeffs)
if 1:
# Pick off the stereo carrier/2 with this filter. It
# attenuated 10 dB so apply 10 dB gain We pick off the
# negative frequency half because we want to base band by
# it!
## NOTE THIS WAS HACKED TO OFFSET INSERTION LOSS DUE TO
## DEEMPHASIS
stereo_carrier_filter_coeffs = gr.firdes.complex_band_pass(
10.0, demod_rate, -19020, -18980, width_of_transition_band,
gr.firdes.WIN_HAMMING)
#print "len stereo carrier filter = ",len(stereo_carrier_filter_coeffs)
#print "stereo carrier filter ", stereo_carrier_filter_coeffs
#print "width of transition band = ",width_of_transition_band, " audio rate = ", audio_rate
# Pick off the double side band suppressed carrier
# Left-Right audio. It is attenuated 10 dB so apply 10 dB
# gain
stereo_dsbsc_filter_coeffs = gr.firdes.complex_band_pass(
20.0, demod_rate, 38000 - 15000 / 2, 38000 + 15000 / 2,
width_of_transition_band, gr.firdes.WIN_HAMMING)
#print "len stereo dsbsc filter = ",len(stereo_dsbsc_filter_coeffs)
#print "stereo dsbsc filter ", stereo_dsbsc_filter_coeffs
# construct overlap add filter system from coefficients
# for stereo carrier
self.stereo_carrier_filter = gr.fir_filter_fcc(
audio_decimation, stereo_carrier_filter_coeffs)
# carrier is twice the picked off carrier so arrange to do
# a commplex multiply
self.stereo_carrier_generator = gr.multiply_cc()
# Pick off the rds signal
stereo_rds_filter_coeffs = gr.firdes.complex_band_pass(
30.0, demod_rate, 57000 - 1500, 57000 + 1500,
width_of_transition_band, gr.firdes.WIN_HAMMING)
#print "len stereo dsbsc filter = ",len(stereo_dsbsc_filter_coeffs)
#print "stereo dsbsc filter ", stereo_dsbsc_filter_coeffs
# construct overlap add filter system from coefficients for stereo carrier
self.rds_signal_filter = gr.fir_filter_fcc(
audio_decimation, stereo_rds_filter_coeffs)
self.rds_carrier_generator = gr.multiply_cc()
self.rds_signal_generator = gr.multiply_cc()
self_rds_signal_processor = gr.null_sink(gr.sizeof_gr_complex)
loop_bw = 2 * math.pi / 100.0
max_freq = -2.0 * math.pi * 18990 / audio_rate
min_freq = -2.0 * math.pi * 19010 / audio_rate
self.stereo_carrier_pll_recovery = gr.pll_refout_cc(
loop_bw, max_freq, min_freq)
#self.stereo_carrier_pll_recovery.squelch_enable(False)
##pll_refout does not have squelch yet, so disabled for
#now
# set up mixer (multiplier) to get the L-R signal at
# baseband
self.stereo_basebander = gr.multiply_cc()
# pick off the real component of the basebanded L-R
# signal. The imaginary SHOULD be zero
self.LmR_real = gr.complex_to_real()
self.Make_Left = gr.add_ff()
self.Make_Right = gr.sub_ff()
self.stereo_dsbsc_filter = gr.fir_filter_fcc(
audio_decimation, stereo_dsbsc_filter_coeffs)
if 1:
# send the real signal to complex filter to pick off the
# carrier and then to one side of a multiplier
self.connect(self, self.fm_demod, self.stereo_carrier_filter,
self.stereo_carrier_pll_recovery,
(self.stereo_carrier_generator, 0))
# send the already filtered carrier to the otherside of the carrier
# the resulting signal from this multiplier is the carrier
# with correct phase but at -38000 Hz.
self.connect(self.stereo_carrier_pll_recovery,
(self.stereo_carrier_generator, 1))
# send the new carrier to one side of the mixer (multiplier)
self.connect(self.stereo_carrier_generator,
(self.stereo_basebander, 0))
# send the demphasized audio to the DSBSC pick off filter, the complex
# DSBSC signal at +38000 Hz is sent to the other side of the mixer/multiplier
# the result is BASEBANDED DSBSC with phase zero!
self.connect(self.fm_demod, self.stereo_dsbsc_filter,
(self.stereo_basebander, 1))
# Pick off the real part since the imaginary is
# theoretically zero and then to one side of a summer
self.connect(self.stereo_basebander, self.LmR_real,
(self.Make_Left, 0))
#take the same real part of the DSBSC baseband signal and
#send it to negative side of a subtracter
self.connect(self.LmR_real, (self.Make_Right, 1))
# Make rds carrier by taking the squared pilot tone and
# multiplying by pilot tone
self.connect(self.stereo_basebander,
(self.rds_carrier_generator, 0))
self.connect(self.stereo_carrier_pll_recovery,
(self.rds_carrier_generator, 1))
# take signal, filter off rds, send into mixer 0 channel
self.connect(self.fm_demod, self.rds_signal_filter,
(self.rds_signal_generator, 0))
# take rds_carrier_generator output and send into mixer 1
# channel
self.connect(self.rds_carrier_generator,
(self.rds_signal_generator, 1))
# send basebanded rds signal and send into "processor"
# which for now is a null sink
self.connect(self.rds_signal_generator, self_rds_signal_processor)
if 1:
# pick off the audio, L+R that is what we used to have and
# send it to the summer
self.connect(self.fm_demod, self.audio_filter, (self.Make_Left, 1))
# take the picked off L+R audio and send it to the PLUS
# side of the subtractor
self.connect(self.audio_filter, (self.Make_Right, 0))
# The result of Make_Left gets (L+R) + (L-R) and results in 2*L
# The result of Make_Right gets (L+R) - (L-R) and results in 2*R
self.connect(self.Make_Left, self.deemph_Left, (self, 0))
self.connect(self.Make_Right, self.deemph_Right, (self, 1))
def __init__(self, *args, **kwds):
# begin wxGlade: MyFrame.__init__
kwds["style"] = wx.DEFAULT_FRAME_STYLE
wx.Frame.__init__(self, *args, **kwds)
# Menu Bar
self.frame_1_menubar = wx.MenuBar()
self.SetMenuBar(self.frame_1_menubar)
wxglade_tmp_menu = wx.Menu()
self.Exit = wx.MenuItem(wxglade_tmp_menu, ID_EXIT, "Exit", "Exit", wx.ITEM_NORMAL)
wxglade_tmp_menu.AppendItem(self.Exit)
self.frame_1_menubar.Append(wxglade_tmp_menu, "File")
# Menu Bar end
self.panel_1 = wx.Panel(self, -1)
self.button_1 = wx.Button(self, ID_BUTTON_1, "LSB")
self.button_2 = wx.Button(self, ID_BUTTON_2, "USB")
self.button_3 = wx.Button(self, ID_BUTTON_3, "AM")
self.button_4 = wx.Button(self, ID_BUTTON_4, "CW")
self.button_5 = wx.ToggleButton(self, ID_BUTTON_5, "Upper")
self.slider_1 = wx.Slider(self, ID_SLIDER_1, 0, -15799, 15799, style=wx.SL_HORIZONTAL | wx.SL_LABELS)
self.button_6 = wx.ToggleButton(self, ID_BUTTON_6, "Lower")
self.slider_2 = wx.Slider(self, ID_SLIDER_2, 0, -15799, 15799, style=wx.SL_HORIZONTAL | wx.SL_LABELS)
self.panel_5 = wx.Panel(self, -1)
self.label_1 = wx.StaticText(self, -1, " Band\nCenter")
self.text_ctrl_1 = wx.TextCtrl(self, ID_TEXT_1, "")
self.panel_6 = wx.Panel(self, -1)
self.panel_7 = wx.Panel(self, -1)
self.panel_2 = wx.Panel(self, -1)
self.button_7 = wx.ToggleButton(self, ID_BUTTON_7, "Freq")
self.slider_3 = wx.Slider(self, ID_SLIDER_3, 3000, 0, 6000)
self.spin_ctrl_1 = wx.SpinCtrl(self, ID_SPIN_1, "", min=0, max=100)
self.button_8 = wx.ToggleButton(self, ID_BUTTON_8, "Vol")
self.slider_4 = wx.Slider(self, ID_SLIDER_4, 0, 0, 500)
self.slider_5 = wx.Slider(self, ID_SLIDER_5, 0, 0, 20)
self.button_9 = wx.ToggleButton(self, ID_BUTTON_9, "Time")
self.button_11 = wx.Button(self, ID_BUTTON_11, "Rew")
self.button_10 = wx.Button(self, ID_BUTTON_10, "Fwd")
self.panel_3 = wx.Panel(self, -1)
self.label_2 = wx.StaticText(self, -1, "PGA ")
self.panel_4 = wx.Panel(self, -1)
self.panel_8 = wx.Panel(self, -1)
self.panel_9 = wx.Panel(self, -1)
self.label_3 = wx.StaticText(self, -1, "AM Sync\nCarrier")
self.slider_6 = wx.Slider(self, ID_SLIDER_6, 50, 0, 200, style=wx.SL_HORIZONTAL | wx.SL_LABELS)
self.label_4 = wx.StaticText(self, -1, "Antenna Tune")
self.slider_7 = wx.Slider(self, ID_SLIDER_7, 1575, 950, 2200, style=wx.SL_HORIZONTAL | wx.SL_LABELS)
self.panel_10 = wx.Panel(self, -1)
self.button_12 = wx.ToggleButton(self, ID_BUTTON_12, "Auto Tune")
self.button_13 = wx.Button(self, ID_BUTTON_13, "Calibrate")
self.button_14 = wx.Button(self, ID_BUTTON_14, "Reset")
self.panel_11 = wx.Panel(self, -1)
self.panel_12 = wx.Panel(self, -1)
self.__set_properties()
self.__do_layout()
# end wxGlade
parser = OptionParser(option_class=eng_option)
parser.add_option(
"-c", "--ddc-freq", type="eng_float", default=3.9e6, help="set Rx DDC frequency to FREQ", metavar="FREQ"
)
parser.add_option("-a", "--audio_file", default="", help="audio output file", metavar="FILE")
parser.add_option("-r", "--radio_file", default="", help="radio output file", metavar="FILE")
parser.add_option("-i", "--input_file", default="", help="radio input file", metavar="FILE")
parser.add_option("-d", "--decim", type="int", default=250, help="USRP decimation")
parser.add_option(
"-R",
"--rx-subdev-spec",
type="subdev",
default=None,
help="select USRP Rx side A or B (default=first one with a daughterboard)",
)
(options, args) = parser.parse_args()
self.usrp_center = options.ddc_freq
usb_rate = 64e6 / options.decim
self.slider_range = usb_rate * 0.9375
self.f_lo = self.usrp_center - (self.slider_range / 2)
self.f_hi = self.usrp_center + (self.slider_range / 2)
self.af_sample_rate = 32000
fir_decim = long(usb_rate / self.af_sample_rate)
# data point arrays for antenna tuner
self.xdata = []
self.ydata = []
self.tb = gr.top_block()
# radio variables, initial conditions
self.frequency = self.usrp_center
# these map the frequency slider (0-6000) to the actual range
self.f_slider_offset = self.f_lo
self.f_slider_scale = 10000 / options.decim
self.spin_ctrl_1.SetRange(self.f_lo, self.f_hi)
self.text_ctrl_1.SetValue(str(int(self.usrp_center)))
self.slider_5.SetValue(0)
self.AM_mode = False
self.slider_3.SetValue((self.frequency - self.f_slider_offset) / self.f_slider_scale)
self.spin_ctrl_1.SetValue(int(self.frequency))
POWERMATE = True
try:
self.pm = powermate.powermate(self)
except:
sys.stderr.write("Unable to find PowerMate or Contour Shuttle\n")
POWERMATE = False
if POWERMATE:
powermate.EVT_POWERMATE_ROTATE(self, self.on_rotate)
powermate.EVT_POWERMATE_BUTTON(self, self.on_pmButton)
self.active_button = 7
# command line options
if options.audio_file == "":
SAVE_AUDIO_TO_FILE = False
else:
SAVE_AUDIO_TO_FILE = True
if options.radio_file == "":
SAVE_RADIO_TO_FILE = False
else:
SAVE_RADIO_TO_FILE = True
if options.input_file == "":
self.PLAY_FROM_USRP = True
else:
self.PLAY_FROM_USRP = False
if self.PLAY_FROM_USRP:
self.src = usrp.source_s(decim_rate=options.decim)
if options.rx_subdev_spec is None:
options.rx_subdev_spec = pick_subdevice(self.src)
self.src.set_mux(usrp.determine_rx_mux_value(self.src, options.rx_subdev_spec))
self.subdev = usrp.selected_subdev(self.src, options.rx_subdev_spec)
self.src.tune(0, self.subdev, self.usrp_center)
self.tune_offset = 0 # -self.usrp_center - self.src.rx_freq(0)
else:
self.src = gr.file_source(gr.sizeof_short, options.input_file)
self.tune_offset = 2200 # 2200 works for 3.5-4Mhz band
# save radio data to a file
if SAVE_RADIO_TO_FILE:
file = gr.file_sink(gr.sizeof_short, options.radio_file)
self.tb.connect(self.src, file)
# 2nd DDC
xlate_taps = gr.firdes.low_pass(1.0, usb_rate, 16e3, 4e3, gr.firdes.WIN_HAMMING)
self.xlate = gr.freq_xlating_fir_filter_ccf(fir_decim, xlate_taps, self.tune_offset, usb_rate)
# convert rf data in interleaved short int form to complex
s2ss = gr.stream_to_streams(gr.sizeof_short, 2)
s2f1 = gr.short_to_float()
s2f2 = gr.short_to_float()
src_f2c = gr.float_to_complex()
self.tb.connect(self.src, s2ss)
self.tb.connect((s2ss, 0), s2f1)
self.tb.connect((s2ss, 1), s2f2)
self.tb.connect(s2f1, (src_f2c, 0))
self.tb.connect(s2f2, (src_f2c, 1))
# Complex Audio filter
audio_coeffs = gr.firdes.complex_band_pass(
1.0, # gain
self.af_sample_rate, # sample rate
-3000, # low cutoff
0, # high cutoff
100, # transition
gr.firdes.WIN_HAMMING,
) # window
self.slider_1.SetValue(0)
self.slider_2.SetValue(-3000)
self.audio_filter = gr.fir_filter_ccc(1, audio_coeffs)
# Main +/- 16Khz spectrum display
self.fft = fftsink2.fft_sink_c(
self.panel_2, fft_size=512, sample_rate=self.af_sample_rate, average=True, size=(640, 240)
)
# AM Sync carrier
if AM_SYNC_DISPLAY:
self.fft2 = fftsink.fft_sink_c(
self.tb,
self.panel_9,
y_per_div=20,
fft_size=512,
sample_rate=self.af_sample_rate,
average=True,
size=(640, 240),
)
c2f = gr.complex_to_float()
# AM branch
self.sel_am = gr.multiply_const_cc(0)
# the following frequencies turn out to be in radians/sample
# gr.pll_refout_cc(alpha,beta,min_freq,max_freq)
# suggested alpha = X, beta = .25 * X * X
pll = gr.pll_refout_cc(
0.5, 0.0625, (2.0 * math.pi * 7.5e3 / self.af_sample_rate), (2.0 * math.pi * 6.5e3 / self.af_sample_rate)
)
self.pll_carrier_scale = gr.multiply_const_cc(complex(10, 0))
am_det = gr.multiply_cc()
# these are for converting +7.5kHz to -7.5kHz
# for some reason gr.conjugate_cc() adds noise ??
c2f2 = gr.complex_to_float()
c2f3 = gr.complex_to_float()
f2c = gr.float_to_complex()
phaser1 = gr.multiply_const_ff(1)
phaser2 = gr.multiply_const_ff(-1)
# filter for pll generated carrier
pll_carrier_coeffs = gr.firdes.complex_band_pass(
2.0, # gain
self.af_sample_rate, # sample rate
7400, # low cutoff
7600, # high cutoff
100, # transition
gr.firdes.WIN_HAMMING,
) # window
self.pll_carrier_filter = gr.fir_filter_ccc(1, pll_carrier_coeffs)
self.sel_sb = gr.multiply_const_ff(1)
combine = gr.add_ff()
# AGC
sqr1 = gr.multiply_ff()
intr = gr.iir_filter_ffd([0.004, 0], [0, 0.999])
offset = gr.add_const_ff(1)
agc = gr.divide_ff()
self.scale = gr.multiply_const_ff(0.00001)
dst = audio.sink(long(self.af_sample_rate))
self.tb.connect(src_f2c, self.xlate, self.fft)
self.tb.connect(self.xlate, self.audio_filter, self.sel_am, (am_det, 0))
self.tb.connect(self.sel_am, pll, self.pll_carrier_scale, self.pll_carrier_filter, c2f3)
self.tb.connect((c2f3, 0), phaser1, (f2c, 0))
self.tb.connect((c2f3, 1), phaser2, (f2c, 1))
self.tb.connect(f2c, (am_det, 1))
self.tb.connect(am_det, c2f2, (combine, 0))
self.tb.connect(self.audio_filter, c2f, self.sel_sb, (combine, 1))
if AM_SYNC_DISPLAY:
self.tb.connect(self.pll_carrier_filter, self.fft2)
self.tb.connect(combine, self.scale)
self.tb.connect(self.scale, (sqr1, 0))
self.tb.connect(self.scale, (sqr1, 1))
self.tb.connect(sqr1, intr, offset, (agc, 1))
self.tb.connect(self.scale, (agc, 0))
self.tb.connect(agc, dst)
if SAVE_AUDIO_TO_FILE:
f_out = gr.file_sink(gr.sizeof_short, options.audio_file)
sc1 = gr.multiply_const_ff(64000)
f2s1 = gr.float_to_short()
self.tb.connect(agc, sc1, f2s1, f_out)
self.tb.start()
# for mouse position reporting on fft display
em.eventManager.Register(self.Mouse, wx.EVT_MOTION, self.fft.win)
# and left click to re-tune
em.eventManager.Register(self.Click, wx.EVT_LEFT_DOWN, self.fft.win)
# start a timer to check for web commands
if WEB_CONTROL:
self.timer = UpdateTimer(self, 1000) # every 1000 mSec, 1 Sec
wx.EVT_BUTTON(self, ID_BUTTON_1, self.set_lsb)
wx.EVT_BUTTON(self, ID_BUTTON_2, self.set_usb)
wx.EVT_BUTTON(self, ID_BUTTON_3, self.set_am)
wx.EVT_BUTTON(self, ID_BUTTON_4, self.set_cw)
wx.EVT_BUTTON(self, ID_BUTTON_10, self.fwd)
wx.EVT_BUTTON(self, ID_BUTTON_11, self.rew)
wx.EVT_BUTTON(self, ID_BUTTON_13, self.AT_calibrate)
wx.EVT_BUTTON(self, ID_BUTTON_14, self.AT_reset)
wx.EVT_TOGGLEBUTTON(self, ID_BUTTON_5, self.on_button)
wx.EVT_TOGGLEBUTTON(self, ID_BUTTON_6, self.on_button)
wx.EVT_TOGGLEBUTTON(self, ID_BUTTON_7, self.on_button)
wx.EVT_TOGGLEBUTTON(self, ID_BUTTON_8, self.on_button)
wx.EVT_TOGGLEBUTTON(self, ID_BUTTON_9, self.on_button)
wx.EVT_SLIDER(self, ID_SLIDER_1, self.set_filter)
wx.EVT_SLIDER(self, ID_SLIDER_2, self.set_filter)
wx.EVT_SLIDER(self, ID_SLIDER_3, self.slide_tune)
wx.EVT_SLIDER(self, ID_SLIDER_4, self.set_volume)
wx.EVT_SLIDER(self, ID_SLIDER_5, self.set_pga)
wx.EVT_SLIDER(self, ID_SLIDER_6, self.am_carrier)
wx.EVT_SLIDER(self, ID_SLIDER_7, self.antenna_tune)
wx.EVT_SPINCTRL(self, ID_SPIN_1, self.spin_tune)
wx.EVT_MENU(self, ID_EXIT, self.TimeToQuit)
def __init__ (self, fg, demod_rate, audio_decimation):
"""
Hierarchical block for demodulating a broadcast FM signal.
The input is the downconverted complex baseband signal (gr_complex).
The output is two streams of the demodulated audio (float) 0=Left, 1=Right.
@param fg: flow graph.
@type fg: flow graph
@param demod_rate: input sample rate of complex baseband input.
@type demod_rate: float
@param audio_decimation: how much to decimate demod_rate to get to audio.
@type audio_decimation: integer
"""
bandwidth = 200e3
audio_rate = demod_rate / audio_decimation
# We assign to self so that outsiders can grab the demodulator
# if they need to. E.g., to plot its output.
#
# input: complex; output: float
alpha = 0.25*bandwidth * math.pi / demod_rate
beta = alpha * alpha / 4.0
max_freq = 2.0*math.pi*100e3/demod_rate
self.fm_demod = gr.pll_freqdet_cf (alpha,beta,max_freq,-max_freq)
# input: float; output: float
self.deemph_Left = fm_deemph (fg, audio_rate)
self.deemph_Right = fm_deemph (fg, audio_rate)
# compute FIR filter taps for audio filter
width_of_transition_band = audio_rate / 32
audio_coeffs = gr.firdes.low_pass (1.0 , # gain
demod_rate, # sampling rate
15000 ,
width_of_transition_band,
gr.firdes.WIN_HAMMING)
# input: float; output: float
self.audio_filter = gr.fir_filter_fff (audio_decimation, audio_coeffs)
if 1:
# Pick off the stereo carrier/2 with this filter. It attenuated 10 dB so apply 10 dB gain
# We pick off the negative frequency half because we want to base band by it!
## NOTE THIS WAS HACKED TO OFFSET INSERTION LOSS DUE TO DEEMPHASIS
stereo_carrier_filter_coeffs = gr.firdes.complex_band_pass(10.0,
demod_rate,
-19020,
-18980,
width_of_transition_band,
gr.firdes.WIN_HAMMING)
#print "len stereo carrier filter = ",len(stereo_carrier_filter_coeffs)
#print "stereo carrier filter ", stereo_carrier_filter_coeffs
#print "width of transition band = ",width_of_transition_band, " audio rate = ", audio_rate
# Pick off the double side band suppressed carrier Left-Right audio. It is attenuated 10 dB so apply 10 dB gain
stereo_dsbsc_filter_coeffs = gr.firdes.complex_band_pass(20.0,
demod_rate,
38000-15000/2,
38000+15000/2,
width_of_transition_band,
gr.firdes.WIN_HAMMING)
#print "len stereo dsbsc filter = ",len(stereo_dsbsc_filter_coeffs)
#print "stereo dsbsc filter ", stereo_dsbsc_filter_coeffs
# construct overlap add filter system from coefficients for stereo carrier
self.stereo_carrier_filter = gr.fir_filter_fcc(audio_decimation, stereo_carrier_filter_coeffs)
# carrier is twice the picked off carrier so arrange to do a commplex multiply
self.stereo_carrier_generator = gr.multiply_cc();
# Pick off the rds signal
stereo_rds_filter_coeffs = gr.firdes.complex_band_pass(30.0,
demod_rate,
57000 - 1500,
57000 + 1500,
width_of_transition_band,
gr.firdes.WIN_HAMMING)
#print "len stereo dsbsc filter = ",len(stereo_dsbsc_filter_coeffs)
#print "stereo dsbsc filter ", stereo_dsbsc_filter_coeffs
# construct overlap add filter system from coefficients for stereo carrier
self.stereo_carrier_filter = gr.fir_filter_fcc(audio_decimation, stereo_carrier_filter_coeffs)
self.rds_signal_filter = gr.fir_filter_fcc(audio_decimation, stereo_rds_filter_coeffs)
self.rds_carrier_generator = gr.multiply_cc();
self.rds_signal_generator = gr.multiply_cc();
self_rds_signal_processor = gr.null_sink(gr.sizeof_gr_complex);
alpha = 5 * 0.25 * math.pi / (audio_rate)
beta = alpha * alpha / 4.0
max_freq = -2.0*math.pi*18990/audio_rate;
min_freq = -2.0*math.pi*19010/audio_rate;
self.stereo_carrier_pll_recovery = gr.pll_refout_cc(alpha,beta,max_freq,min_freq);
#self.stereo_carrier_pll_recovery.squelch_enable(False) #pll_refout does not have squelch yet, so disabled for now
# set up mixer (multiplier) to get the L-R signal at baseband
self.stereo_basebander = gr.multiply_cc();
# pick off the real component of the basebanded L-R signal. The imaginary SHOULD be zero
self.LmR_real = gr.complex_to_real();
self.Make_Left = gr.add_ff();
self.Make_Right = gr.sub_ff();
self.stereo_dsbsc_filter = gr.fir_filter_fcc(audio_decimation, stereo_dsbsc_filter_coeffs)
if 1:
# send the real signal to complex filter to pick off the carrier and then to one side of a multiplier
fg.connect (self.fm_demod,self.stereo_carrier_filter,self.stereo_carrier_pll_recovery, (self.stereo_carrier_generator,0))
# send the already filtered carrier to the otherside of the carrier
fg.connect (self.stereo_carrier_pll_recovery, (self.stereo_carrier_generator,1))
# the resulting signal from this multiplier is the carrier with correct phase but at -38000 Hz.
# send the new carrier to one side of the mixer (multiplier)
fg.connect (self.stereo_carrier_generator, (self.stereo_basebander,0))
# send the demphasized audio to the DSBSC pick off filter, the complex
# DSBSC signal at +38000 Hz is sent to the other side of the mixer/multiplier
fg.connect (self.fm_demod,self.stereo_dsbsc_filter, (self.stereo_basebander,1))
# the result is BASEBANDED DSBSC with phase zero!
# Pick off the real part since the imaginary is theoretically zero and then to one side of a summer
fg.connect (self.stereo_basebander, self.LmR_real, (self.Make_Left,0))
#take the same real part of the DSBSC baseband signal and send it to negative side of a subtracter
fg.connect (self.LmR_real,(self.Make_Right,1))
# Make rds carrier by taking the squared pilot tone and multiplying by pilot tone
fg.connect (self.stereo_basebander,(self.rds_carrier_generator,0))
fg.connect (self.stereo_carrier_pll_recovery,(self.rds_carrier_generator,1))
# take signal, filter off rds, send into mixer 0 channel
fg.connect (self.fm_demod,self.rds_signal_filter,(self.rds_signal_generator,0))
# take rds_carrier_generator output and send into mixer 1 channel
fg.connect (self.rds_carrier_generator,(self.rds_signal_generator,1))
# send basebanded rds signal and send into "processor" which for now is a null sink
fg.connect (self.rds_signal_generator,self_rds_signal_processor)
if 1:
# pick off the audio, L+R that is what we used to have and send it to the summer
fg.connect(self.fm_demod, self.audio_filter, (self.Make_Left, 1))
# take the picked off L+R audio and send it to the PLUS side of the subtractor
fg.connect(self.audio_filter,(self.Make_Right, 0))
# The result of Make_Left gets (L+R) + (L-R) and results in 2*L
# The result of Make_Right gets (L+R) - (L-R) and results in 2*R
# kludge the signals into a stereo channel
kludge = gr.kludge_copy(gr.sizeof_float)
fg.connect(self.Make_Left , self.deemph_Left, (kludge, 0))
fg.connect(self.Make_Right, self.deemph_Right, (kludge, 1))
#send it to the audio system
gr.hier_block.__init__(self,
fg,
self.fm_demod, # head of the pipeline
kludge) # tail of the pipeline
else:
fg.connect (self.fm_demod, self.audio_filter)
gr.hier_block.__init__(self,
fg,
self.fm_demod, # head of the pipeline
self.audio_filter) # tail of the pipeline
def test_pll_refout (self):
expected_result = ((1+7.39965699825e-10j),
(0.999980390072+0.00626518437639j),
(0.999828696251+0.0185074284673j),
(0.999342679977+0.0362518876791j),
(0.998255133629+0.0590478181839j),
(0.996255218983+0.0864609107375j),
(0.993005692959+0.118066303432j),
(0.988157629967+0.153442293406j),
(0.981362581253+0.192165210843j),
(0.972283244133+0.233806177974j),
(0.960601866245+0.277928203344j),
(0.946027755737+0.324085712433j),
(0.928303182125+0.371824204922j),
(0.907292485237+0.420500129461j),
(0.882742881775+0.469856351614j),
(0.854515135288+0.519426465034j),
(0.822515428066+0.568742752075j),
(0.786696314812+0.617340147495j),
(0.747057616711+0.664759278297j),
(0.703645646572+0.710551083088j),
(0.656552672386+0.754280209541j),
(0.605915129185+0.795529305935j),
(0.551911592484+0.833902597427j),
(0.494760006666+0.869029641151j),
(0.43471455574+0.900568306446j),
(0.37224894762+0.928132891655j),
(0.30767711997+0.951490819454j),
(0.241136431694+0.970491230488j),
(0.172981828451+0.984925031662j),
(0.103586450219+0.99462044239j),
(0.0333373323083+0.999444127083j),
(-0.0373690575361+0.999301552773j),
(-0.108130030334+0.994136750698j),
(-0.178540825844+0.983932495117j),
(-0.248198583722+0.968709170818j),
(-0.316705673933+0.948523879051j),
(-0.383672952652+0.923469007015j),
(-0.448723316193+0.893670737743j),
(-0.51132196188+0.85938924551j),
(-0.571328520775+0.820721447468j),
(-0.628420114517+0.777874112129j),
(-0.682293117046+0.73107868433j),
(-0.732665538788+0.680588841438j),
(-0.779277384281+0.626679122448j),
(-0.821892917156+0.569642007351j),
(-0.860301196575+0.509786069393j),
(-0.894317150116+0.447433561087j),
(-0.923782229424+0.382918298244j),
(-0.948564887047+0.316582858562j),
(-0.968560874462+0.248776733875j),
(-0.983657121658+0.180051699281j),
(-0.993847966194+0.110753215849j),
(-0.999158322811+0.0410195216537j),
(-0.999585151672-0.0288011860102j),
(-0.995150566101-0.0983632653952j),
(-0.985901713371-0.16732545197j),
(-0.971909940243-0.235353127122j),
(-0.953270018101-0.302119642496j),
(-0.9300994277-0.367307811975j),
(-0.902537107468-0.430612027645j),
(-0.870742559433-0.49173912406j),
(-0.834894418716-0.550410091877j),
(-0.795189499855-0.606360971928j),
(-0.751972675323-0.659194231033j),
(-0.705345034599-0.708864152431j),
(-0.65554022789-0.755160272121j),
(-0.602804005146-0.79788929224j),
(-0.547393083572-0.836875617504j),
(-0.489574223757-0.871961653233j),
(-0.429622590542-0.903008520603j),
(-0.367820799351-0.929896712303j),
(-0.30445766449-0.952525854111j),
(-0.239826664329-0.970815718174j),
(-0.174224823713-0.984705924988j),
(-0.107951194048-0.994156181812j),
(-0.0415063276887-0.999138236046j),
(0.0248276274651-0.999691724777j),
(0.0909758731723-0.995853126049j),
(0.156649470329-0.987654268742j),
(0.221562758088-0.975146114826j),
(0.285434871912-0.958398103714j),
(0.347990810871-0.937497973442j),
(0.408962905407-0.912550985813j),
(0.468091338873-0.883680105209j),
(0.525126338005-0.851024270058j),
(0.57982814312-0.814738810062j),
(0.631968915462-0.77499371767j),
(0.681333422661-0.731973171234j),
(0.727582573891-0.68602013588j),
(0.770699381828-0.637198925018j),
(0.810512244701-0.585721731186j),
(0.846863090992-0.531810998917j),
(0.879608631134-0.475698113441j),
(0.908620357513-0.417623132467j),
(0.933785498142-0.357833325863j),
(0.955007195473-0.296582698822j),
(0.972205162048-0.234130680561j),
(0.985315918922-0.170741200447j),
(0.994293272495-0.106681488454j),
(0.999108314514-0.0422209985554j))
sampling_freq = 10e3
freq = sampling_freq / 100
alpha = 0.1
beta = alpha * alpha / 4.0
maxf = 1
minf = -1
src = gr.sig_source_c (sampling_freq, gr.GR_COS_WAVE, freq, 1.0)
pll = gr.pll_refout_cc(alpha, beta, maxf, minf)
head = gr.head (gr.sizeof_gr_complex, int (freq))
dst = gr.vector_sink_c ()
self.tb.connect (src, pll, head)
self.tb.connect (head, dst)
self.tb.run ()
dst_data = dst.data ()
self.assertComplexTuplesAlmostEqual (expected_result, dst_data, 5)
def test_pll_refout(self):
expected_result = (
(1 + 7.39965699825e-10j), (0.999980390072 + 0.00626518437639j),
(0.999828696251 + 0.0185074284673j),
(0.999342679977 + 0.0362518876791j), (0.998255133629 +
0.0590478181839j),
(0.996255218983 + 0.0864609107375j), (0.993005692959 +
0.118066303432j),
(0.988157629967 + 0.153442293406j), (0.981362581253 +
0.192165210843j),
(0.972283244133 + 0.233806177974j), (0.960601866245 +
0.277928203344j),
(0.946027755737 + 0.324085712433j), (0.928303182125 +
0.371824204922j),
(0.907292485237 + 0.420500129461j), (0.882742881775 +
0.469856351614j),
(0.854515135288 + 0.519426465034j), (0.822515428066 +
0.568742752075j),
(0.786696314812 + 0.617340147495j), (0.747057616711 +
0.664759278297j),
(0.703645646572 + 0.710551083088j), (0.656552672386 +
0.754280209541j),
(0.605915129185 + 0.795529305935j), (0.551911592484 +
0.833902597427j),
(0.494760006666 + 0.869029641151j), (0.43471455574 +
0.900568306446j),
(0.37224894762 + 0.928132891655j), (0.30767711997 +
0.951490819454j),
(0.241136431694 + 0.970491230488j), (0.172981828451 +
0.984925031662j),
(0.103586450219 + 0.99462044239j), (0.0333373323083 +
0.999444127083j),
(-0.0373690575361 + 0.999301552773j), (-0.108130030334 +
0.994136750698j),
(-0.178540825844 + 0.983932495117j), (-0.248198583722 +
0.968709170818j),
(-0.316705673933 + 0.948523879051j), (-0.383672952652 +
0.923469007015j),
(-0.448723316193 + 0.893670737743j), (-0.51132196188 +
0.85938924551j),
(-0.571328520775 + 0.820721447468j), (-0.628420114517 +
0.777874112129j),
(-0.682293117046 + 0.73107868433j), (-0.732665538788 +
0.680588841438j),
(-0.779277384281 + 0.626679122448j), (-0.821892917156 +
0.569642007351j),
(-0.860301196575 + 0.509786069393j), (-0.894317150116 +
0.447433561087j),
(-0.923782229424 + 0.382918298244j), (-0.948564887047 +
0.316582858562j),
(-0.968560874462 + 0.248776733875j), (-0.983657121658 +
0.180051699281j),
(-0.993847966194 + 0.110753215849j), (-0.999158322811 +
0.0410195216537j),
(-0.999585151672 - 0.0288011860102j), (-0.995150566101 -
0.0983632653952j),
(-0.985901713371 -
0.16732545197j), (-0.971909940243 -
0.235353127122j), (-0.953270018101 -
0.302119642496j),
(-0.9300994277 -
0.367307811975j), (-0.902537107468 -
0.430612027645j), (-0.870742559433 -
0.49173912406j),
(-0.834894418716 -
0.550410091877j), (-0.795189499855 -
0.606360971928j), (-0.751972675323 -
0.659194231033j),
(-0.705345034599 -
0.708864152431j), (-0.65554022789 -
0.755160272121j), (-0.602804005146 -
0.79788929224j),
(-0.547393083572 -
0.836875617504j), (-0.489574223757 -
0.871961653233j), (-0.429622590542 -
0.903008520603j),
(-0.367820799351 -
0.929896712303j), (-0.30445766449 -
0.952525854111j), (-0.239826664329 -
0.970815718174j),
(-0.174224823713 -
0.984705924988j), (-0.107951194048 -
0.994156181812j), (-0.0415063276887 -
0.999138236046j),
(0.0248276274651 -
0.999691724777j), (0.0909758731723 -
0.995853126049j), (0.156649470329 -
0.987654268742j),
(0.221562758088 -
0.975146114826j), (0.285434871912 -
0.958398103714j), (0.347990810871 -
0.937497973442j),
(0.408962905407 -
0.912550985813j), (0.468091338873 -
0.883680105209j), (0.525126338005 -
0.851024270058j),
(0.57982814312 -
0.814738810062j), (0.631968915462 -
0.77499371767j), (0.681333422661 -
0.731973171234j),
(0.727582573891 -
0.68602013588j), (0.770699381828 -
0.637198925018j), (0.810512244701 -
0.585721731186j),
(0.846863090992 -
0.531810998917j), (0.879608631134 -
0.475698113441j), (0.908620357513 -
0.417623132467j),
(0.933785498142 -
0.357833325863j), (0.955007195473 -
0.296582698822j), (0.972205162048 -
0.234130680561j),
(0.985315918922 -
0.170741200447j), (0.994293272495 -
0.106681488454j), (0.999108314514 -
0.0422209985554j))
sampling_freq = 10e3
freq = sampling_freq / 100
alpha = 0.1
beta = alpha * alpha / 4.0
maxf = 1
minf = -1
src = gr.sig_source_c(sampling_freq, gr.GR_COS_WAVE, freq, 1.0)
pll = gr.pll_refout_cc(alpha, beta, maxf, minf)
head = gr.head(gr.sizeof_gr_complex, int(freq))
dst = gr.vector_sink_c()
self.tb.connect(src, pll, head)
self.tb.connect(head, dst)
self.tb.run()
dst_data = dst.data()
self.assertComplexTuplesAlmostEqual(expected_result, dst_data, 5)
def test_pll_refout (self):
expected_result = ((1+0j),
(1+6.4087357643e-10j),
(0.999985277653+0.00542619498447j),
(0.999868750572+0.0162021834403j),
(0.99948567152+0.0320679470897j),
(0.99860727787+0.0527590736747j),
(0.996953129768+0.0780025869608j),
(0.994203746319+0.107512556016j),
(0.990011692047+0.140985429287j),
(0.984013140202+0.178095817566j),
(0.975838363171+0.218493551016j),
(0.965121984482+0.261800557375j),
(0.95151245594+0.307610183954j),
(0.934681296349+0.355486690998j),
(0.914401650429+0.404808044434j),
(0.890356600285+0.455263823271j),
(0.862329125404+0.506348133087j),
(0.830152392387+0.557536482811j),
(0.793714106083+0.608290970325j),
(0.752960026264+0.658066213131j),
(0.707896590233+0.706316053867j),
(0.658591926098+0.752500295639j),
(0.605175673962+0.796091973782j),
(0.547837555408+0.836584687233j),
(0.48682525754+0.873499393463j),
(0.42244040966+0.906390726566j),
(0.355197101831+0.934791445732j),
(0.285494059324+0.958380460739j),
(0.213591173291+0.976923108101j),
(0.139945343137+0.990159213543j),
(0.065038472414+0.997882783413j),
(-0.0106285437942+0.999943494797j),
(-0.0865436866879+0.996248066425j),
(-0.162189796567+0.986759603024j),
(-0.23705175519+0.971496999264j),
(-0.310622543097+0.950533330441j),
(-0.38240903616+0.923993110657j),
(-0.451937526464+0.89204955101j),
(-0.518758952618+0.854920566082j),
(-0.582311093807+0.812966048717j),
(-0.642372369766+0.76639264822j),
(-0.698591887951+0.715520322323j),
(-0.750654160976+0.660695314407j),
(-0.798280358315+0.602286040783j),
(-0.841228663921+0.540679454803j),
(-0.87929558754+0.476276367903j),
(-0.912315964699+0.409486919641j),
(-0.940161883831+0.340728074312j),
(-0.962742805481+0.270418733358j),
(-0.980004072189+0.198977485299j),
(-0.991925954819+0.126818284392j),
(-0.99851256609+0.0545223206282j),
(-0.999846458435-0.0175215266645j),
(-0.996021270752-0.0891158208251j),
(-0.987133920193-0.159895718098j),
(-0.973306238651-0.2295101583j),
(-0.954683184624-0.297624111176j),
(-0.931430280209-0.363919824362j),
(-0.903732538223-0.428097635508j),
(-0.871792256832-0.489875763655j),
(-0.835827112198-0.548992812634j),
(-0.796068251133-0.605206847191j),
(-0.752758979797-0.658296227455j),
(-0.706152498722-0.70805978775j),
(-0.656641483307-0.754202902317j),
(-0.604367733002-0.79670548439j),
(-0.549597978592-0.835429251194j),
(-0.492602348328-0.870254516602j),
(-0.433654457331-0.901079237461j),
(-0.373029649258-0.927819430828j),
(-0.31100410223-0.950408577919j),
(-0.247853919864-0.968797445297j),
(-0.183855071664-0.982953369617j),
(-0.119282215834-0.992860376835j),
(-0.0544078871608-0.998518764973j),
(0.0104992967099-0.999944865704j),
(0.0749994292855-0.997183561325j),
(0.138844624162-0.990314185619j),
(0.201967850327-0.979392170906j),
(0.264124274254-0.964488625526j),
(0.325075358152-0.945688128471j),
(0.3845885396-0.92308807373j),
(0.442438393831-0.89679890871j),
(0.498407125473-0.866943061352j),
(0.552284479141-0.833655714989j),
(0.603869199753-0.797083437443j),
(0.652970373631-0.757383465767j),
(0.69940674305-0.714723825455j),
(0.743007957935-0.66928255558j),
(0.78350687027-0.62138313055j),
(0.820889055729-0.571087777615j),
(0.855021059513-0.51859331131j),
(0.885780930519-0.46410369873j),
(0.913058102131-0.407829582691j),
(0.936754107475-0.349988251925j),
(0.956783294678-0.290801793337j),
(0.973072886467-0.230497643352j),
(0.985563337803-0.169307261705j),
(0.9942086339-0.1074674353j),
(0.9989772439-0.0452152714133j))
sampling_freq = 10e3
freq = sampling_freq / 100
loop_bw = math.pi/100.0
maxf = 1
minf = -1
src = gr.sig_source_c (sampling_freq, gr.GR_COS_WAVE, freq, 1.0)
pll = gr.pll_refout_cc(loop_bw, maxf, minf)
head = gr.head (gr.sizeof_gr_complex, int (freq))
dst = gr.vector_sink_c ()
self.tb.connect (src, pll, head)
self.tb.connect (head, dst)
self.tb.run ()
dst_data = dst.data ()
self.assertComplexTuplesAlmostEqual (expected_result, dst_data, 4)
def __init__ (self, demod_rate, audio_decimation):
"""
Hierarchical block for demodulating a broadcast FM signal.
The input is the downconverted complex baseband signal
(gr_complex). The output is two streams of the demodulated
audio (float) 0=Left, 1=Right.
Args:
demod_rate: input sample rate of complex baseband input. (float)
audio_decimation: how much to decimate demod_rate to get to audio. (integer)
"""
gr.hier_block2.__init__(self, "wfm_rcv_fmdet",
gr.io_signature(1, 1, gr.sizeof_gr_complex), # Input signature
gr.io_signature(2, 2, gr.sizeof_float)) # Output signature
lowfreq = -125e3/demod_rate
highfreq = 125e3/demod_rate
audio_rate = demod_rate / audio_decimation
# We assign to self so that outsiders can grab the demodulator
# if they need to. E.g., to plot its output.
#
# input: complex; output: float
self.fm_demod = gr.fmdet_cf (demod_rate, lowfreq, highfreq, 0.05)
# input: float; output: float
self.deemph_Left = fm_deemph (audio_rate)
self.deemph_Right = fm_deemph (audio_rate)
# compute FIR filter taps for audio filter
width_of_transition_band = audio_rate / 32
audio_coeffs = gr.firdes.low_pass (1.0 , # gain
demod_rate, # sampling rate
15000 ,
width_of_transition_band,
gr.firdes.WIN_HAMMING)
# input: float; output: float
self.audio_filter = gr.fir_filter_fff (audio_decimation, audio_coeffs)
if 1:
# Pick off the stereo carrier/2 with this filter. It
# attenuated 10 dB so apply 10 dB gain We pick off the
# negative frequency half because we want to base band by
# it!
## NOTE THIS WAS HACKED TO OFFSET INSERTION LOSS DUE TO
## DEEMPHASIS
stereo_carrier_filter_coeffs = gr.firdes.complex_band_pass(10.0,
demod_rate,
-19020,
-18980,
width_of_transition_band,
gr.firdes.WIN_HAMMING)
#print "len stereo carrier filter = ",len(stereo_carrier_filter_coeffs)
#print "stereo carrier filter ", stereo_carrier_filter_coeffs
#print "width of transition band = ",width_of_transition_band, " audio rate = ", audio_rate
# Pick off the double side band suppressed carrier
# Left-Right audio. It is attenuated 10 dB so apply 10 dB
# gain
stereo_dsbsc_filter_coeffs = gr.firdes.complex_band_pass(20.0,
demod_rate,
38000-15000/2,
38000+15000/2,
width_of_transition_band,
gr.firdes.WIN_HAMMING)
#print "len stereo dsbsc filter = ",len(stereo_dsbsc_filter_coeffs)
#print "stereo dsbsc filter ", stereo_dsbsc_filter_coeffs
# construct overlap add filter system from coefficients
# for stereo carrier
self.stereo_carrier_filter = gr.fir_filter_fcc(audio_decimation,
stereo_carrier_filter_coeffs)
# carrier is twice the picked off carrier so arrange to do
# a commplex multiply
self.stereo_carrier_generator = gr.multiply_cc();
# Pick off the rds signal
stereo_rds_filter_coeffs = gr.firdes.complex_band_pass(30.0,
demod_rate,
57000 - 1500,
57000 + 1500,
width_of_transition_band,
gr.firdes.WIN_HAMMING)
#print "len stereo dsbsc filter = ",len(stereo_dsbsc_filter_coeffs)
#print "stereo dsbsc filter ", stereo_dsbsc_filter_coeffs
# construct overlap add filter system from coefficients for stereo carrier
self.rds_signal_filter = gr.fir_filter_fcc(audio_decimation,
stereo_rds_filter_coeffs)
self.rds_carrier_generator = gr.multiply_cc();
self.rds_signal_generator = gr.multiply_cc();
self_rds_signal_processor = gr.null_sink(gr.sizeof_gr_complex);
loop_bw = 2*math.pi/100.0
max_freq = -2.0*math.pi*18990/audio_rate;
min_freq = -2.0*math.pi*19010/audio_rate;
self.stereo_carrier_pll_recovery = gr.pll_refout_cc(loop_bw,
max_freq,
min_freq);
#self.stereo_carrier_pll_recovery.squelch_enable(False)
##pll_refout does not have squelch yet, so disabled for
#now
# set up mixer (multiplier) to get the L-R signal at
# baseband
self.stereo_basebander = gr.multiply_cc();
# pick off the real component of the basebanded L-R
# signal. The imaginary SHOULD be zero
self.LmR_real = gr.complex_to_real();
self.Make_Left = gr.add_ff();
self.Make_Right = gr.sub_ff();
self.stereo_dsbsc_filter = gr.fir_filter_fcc(audio_decimation,
stereo_dsbsc_filter_coeffs)
if 1:
# send the real signal to complex filter to pick off the
# carrier and then to one side of a multiplier
self.connect (self, self.fm_demod, self.stereo_carrier_filter,
self.stereo_carrier_pll_recovery,
(self.stereo_carrier_generator,0))
# send the already filtered carrier to the otherside of the carrier
# the resulting signal from this multiplier is the carrier
# with correct phase but at -38000 Hz.
self.connect (self.stereo_carrier_pll_recovery, (self.stereo_carrier_generator,1))
# send the new carrier to one side of the mixer (multiplier)
self.connect (self.stereo_carrier_generator, (self.stereo_basebander,0))
# send the demphasized audio to the DSBSC pick off filter, the complex
# DSBSC signal at +38000 Hz is sent to the other side of the mixer/multiplier
# the result is BASEBANDED DSBSC with phase zero!
self.connect (self.fm_demod,self.stereo_dsbsc_filter, (self.stereo_basebander,1))
# Pick off the real part since the imaginary is
# theoretically zero and then to one side of a summer
self.connect (self.stereo_basebander, self.LmR_real, (self.Make_Left,0))
#take the same real part of the DSBSC baseband signal and
#send it to negative side of a subtracter
self.connect (self.LmR_real,(self.Make_Right,1))
# Make rds carrier by taking the squared pilot tone and
# multiplying by pilot tone
self.connect (self.stereo_basebander,(self.rds_carrier_generator,0))
self.connect (self.stereo_carrier_pll_recovery,(self.rds_carrier_generator,1))
# take signal, filter off rds, send into mixer 0 channel
self.connect (self.fm_demod,self.rds_signal_filter,(self.rds_signal_generator,0))
# take rds_carrier_generator output and send into mixer 1
# channel
self.connect (self.rds_carrier_generator,(self.rds_signal_generator,1))
# send basebanded rds signal and send into "processor"
# which for now is a null sink
self.connect (self.rds_signal_generator,self_rds_signal_processor)
if 1:
# pick off the audio, L+R that is what we used to have and
# send it to the summer
self.connect(self.fm_demod, self.audio_filter, (self.Make_Left, 1))
# take the picked off L+R audio and send it to the PLUS
# side of the subtractor
self.connect(self.audio_filter,(self.Make_Right, 0))
# The result of Make_Left gets (L+R) + (L-R) and results in 2*L
# The result of Make_Right gets (L+R) - (L-R) and results in 2*R
self.connect(self.Make_Left , self.deemph_Left, (self, 0))
self.connect(self.Make_Right, self.deemph_Right, (self, 1))
