def __init__(self):
grc_wxgui.top_block_gui.__init__(self, title="Top Block")
##################################################
# Variables
##################################################
self.samp_rate = samp_rate = 500e3
##################################################
# Blocks
##################################################
self.blks2_nbfm_tx_0 = blks2.nbfm_tx(
audio_rate=25000,
quad_rate=100000,
tau=75e-6,
max_dev=5e3,
)
self.blks2_rational_resampler_xxx_0 = blks2.rational_resampler_ccc(
interpolation=5,
decimation=1,
taps=None,
fractional_bw=None,
)
self.gr_multiply_xx_0 = gr.multiply_vcc(1)
self.gr_sig_source_x_0 = gr.sig_source_c(samp_rate, gr.GR_COS_WAVE,
6.9e3, 1, 0)
self.gr_wavfile_source_0 = gr.wavfile_source("classical.wav", True)
self.uhd_single_usrp_sink_0 = uhd.single_usrp_sink(
device_addr="addr=192.168.10.2",
io_type=uhd.io_type.COMPLEX_FLOAT32,
num_channels=1,
)
self.uhd_single_usrp_sink_0.set_samp_rate(samp_rate)
self.uhd_single_usrp_sink_0.set_center_freq(462.5625e6, 0)
self.uhd_single_usrp_sink_0.set_gain(30, 0)
##################################################
# Connections
##################################################
self.connect((self.gr_wavfile_source_0, 0), (self.blks2_nbfm_tx_0, 0))
self.connect((self.blks2_nbfm_tx_0, 0),
(self.blks2_rational_resampler_xxx_0, 0))
self.connect((self.blks2_rational_resampler_xxx_0, 0),
(self.gr_multiply_xx_0, 0))
self.connect((self.gr_sig_source_x_0, 0), (self.gr_multiply_xx_0, 1))
self.connect((self.gr_multiply_xx_0, 0),
(self.uhd_single_usrp_sink_0, 0))
def __init__(self):
grc_wxgui.top_block_gui.__init__(self, title="Top Block")
##################################################
# Variables
##################################################
self.samp_rate = samp_rate = 500e3
##################################################
# Blocks
##################################################
self.blks2_nbfm_tx_0 = blks2.nbfm_tx(
audio_rate=25000,
quad_rate=100000,
tau=75e-6,
max_dev=5e3,
)
self.blks2_rational_resampler_xxx_0 = blks2.rational_resampler_ccc(
interpolation=5,
decimation=1,
taps=None,
fractional_bw=None,
)
self.gr_multiply_xx_0 = gr.multiply_vcc(1)
self.gr_sig_source_x_0 = gr.sig_source_c(samp_rate, gr.GR_COS_WAVE, 6.9e3, 1, 0)
self.gr_wavfile_source_0 = gr.wavfile_source("classical.wav", True)
self.uhd_single_usrp_sink_0 = uhd.single_usrp_sink(
device_addr="addr=192.168.10.2",
io_type=uhd.io_type.COMPLEX_FLOAT32,
num_channels=1,
)
self.uhd_single_usrp_sink_0.set_samp_rate(samp_rate)
self.uhd_single_usrp_sink_0.set_center_freq(462.5625e6, 0)
self.uhd_single_usrp_sink_0.set_gain(30, 0)
##################################################
# Connections
##################################################
self.connect((self.gr_wavfile_source_0, 0), (self.blks2_nbfm_tx_0, 0))
self.connect((self.blks2_nbfm_tx_0, 0), (self.blks2_rational_resampler_xxx_0, 0))
self.connect((self.blks2_rational_resampler_xxx_0, 0), (self.gr_multiply_xx_0, 0))
self.connect((self.gr_sig_source_x_0, 0), (self.gr_multiply_xx_0, 1))
self.connect((self.gr_multiply_xx_0, 0), (self.uhd_single_usrp_sink_0, 0))
def __init__(self, modulator, demodulator, access_code=None, hint="addr=192.168.10.2"):
gr.hier_block2.__init__(self, "Physical Layer", gr.io_signature(0, 0, 0), gr.io_signature(0, 0, 0))
if access_code is "master":
self.rx_offset = 8e6
access_code = None
elif access_code is "slave":
self.rx_offset = -8e6
access_code = None
else:
self.rx_offset = 0
# create TX/RX
self.u_tx = uhd.single_usrp_sink(hint, io_type=uhd.io_type_t.COMPLEX_FLOAT32, num_channels=1)
self.u_rx = uhd.single_usrp_source(hint, io_type=uhd.io_type_t.COMPLEX_FLOAT32, num_channels=1)
self.access_code = access_code
# create packetmods
self.pkt_mod = blks2.mod_pkts(modulator, pad_for_usrp=True, access_code=self.access_code)
self.pkt_demod = blks2.demod_pkts(demodulator, callback=self.rx_callback, access_code=self.access_code)
self.connect(self.u_rx, self.pkt_demod)
self.connect(self.pkt_mod, self.u_tx)
def _setup_uhd(self):
self._u = uhd.single_usrp_sink(self._ip_addr, io_type=uhd.io_type_t.COMPLEX_FLOAT32, num_channels=1)
def __init__(self, freq, subdev_spec, which_USRP, audio_input, debug):
#gr.hier_block2.__init__(self, "analog_transmit_path",
# gr.io_signature(0, 0, 0), #input signature
# gr.io_signature(0, 0, 0)) #output signature
gr.top_block.__init__(self)
self.DEBUG = debug
self.freq = freq
#self.freq = 462562500
# audio_input="hw:0"
#Formerly from XML
self.tx_usrp_pga_gain_scaling = 1.0
self.tx_power = 1
self.tx_mod_type = 'fm'
self.tx_freq_deviation = 2.5e3
self.tx_base_band_bw = 5e3
################## USRP settings ###################
r = gr.enable_realtime_scheduling ()
# acquire USRP via USB 2.0
#self.u = usrp.sink_c(fusb_block_size=1024,
# fusb_nblocks=4,
# which=which_USRP)
self.u = uhd.single_usrp_sink(
device_addr="",
io_type=uhd.io_type_t.COMPLEX_FLOAT32,
num_channels=1,
)
# get D/A converter sampling rate
#self.dac_rate = self.u.dac_rate() #128 MS/s
self.dac_rate = 128e6 #128 MS/s
if self.DEBUG:
print " Tx Path DAC rate: %d" %(self.dac_rate)
#System digital sample rate setting
self.audio_rate = 16e3
self._gr_interp = 16
self.max_gr_interp_rate = 40
self._usrp_interp = 500
self.gr_rate = self.dac_rate / self._usrp_interp
self._gr_decim = 1
if self.DEBUG:
print " usrp interp: ", self._usrp_interp
print " gr interp: ", self._gr_interp
print " gr rate1: ", self.gr_rate
print " gr decim: ", self._gr_decim
print " audio rate: ", self.audio_rate
# set USRP interplation ratio
#self.u.set_interp_rate(self._usrp_interp)
self.u.set_samp_rate(self.gr_rate)
# set USRP daughterboard subdevice
#if subdev_spec is None:
# subdev_spec = usrp.pick_tx_subdevice(self.u)
#self.u.set_mux(usrp.determine_tx_mux_value(self.u, subdev_spec))
#self.subdev = usrp.selected_subdev(self.u, subdev_spec)
self.u.set_antenna("TX/RX")
#if self.DEBUG:
# print " TX Path use daughterboard: %s" % (self.subdev.side_and_name())
# Set center frequency of USRP
"""
Set the center frequency we're interested in.
Tuning is a two step process. First we ask the front-end to
tune as close to the desired frequency as it can. Then we use
the result of that operation and our target_frequency to
determine the value for the digital up converter.
"""
assert(self.freq != None)
#r = self.u.tune(self.subdev.which(), self.subdev, self.freq)
r = self.u.set_center_freq(self.freq, 0)
if self.DEBUG:
if r:
print " Tx Frequency: %s" %(eng_notation.num_to_str(self.freq))
else:
print "----Failed to set Tx frequency to %s" % (eng_notation.num_to_str(self.freq),)
raise ValueError
# Set the USRP Tx PGA gain, (Note that on the RFX cards this is a nop.)
# subdev.set_gain(subdev.gain_range()[1]) # set max Tx gain
#g = self.subdev.gain_range()
g = self.u.get_gain_range(0)
#_tx_usrp_gain_range = g[1]-g[0]
_tx_usrp_gain_range = g
#_tx_usrp_gain = g[0] + _tx_usrp_gain_range * self.tx_usrp_pga_gain_scaling
#_tx_usrp_gain = g + _tx_usrp_gain_range * self.tx_usrp_pga_gain_scaling
#self.subdev.set_gain(_tx_usrp_gain)
#self.u.set_gain(_tx_usrp_gain, 0)
self.u.set_gain(10, 0)
#if self.DEBUG:
# print " USRP Tx PGA Gain Range: min = %g, max = %g, step size = %g" \
# %(g[0], g[1], g[2])
# print " USRP Tx PGA gain set to: %g" %(_tx_usrp_gain)
# Set the transmit amplitude sent to the USRP (param: ampl 0 <= ampl < 16384.)
"""
Convert tx_power(mW) in waveform.xml to amplitude in gnu radio
"""
ampl= 1638.3*pow(self.tx_power, 0.5)
self.tx_amplitude = max(0.0, min(ampl, 16383.0))
if self.DEBUG:
print "tx amplitude:", self.tx_amplitude
#gr digital amplifier
self.tx_amplitude = 1.0
self.gr_amp = gr.multiply_const_cc (int(self.tx_amplitude)) # software amplifier (scaler)
print "GR amp= ", int(self.tx_amplitude)
if self.DEBUG:
print " Tx power acquired from waveform configuration XML file is: %f between (0, 100.0mW)" %(self.tx_power)
print " Tx Path initial software signal amplitude to USRP: %f / 16383.0" %(ampl)
print " Tx Path actual software signal amplitude to USRP: %f / 16383.0" %(self.tx_amplitude)
################## Choose the corresponding analog modem ###################
if self.DEBUG:
print "----Tx path modulation: %s" % (self.tx_mod_type)
chan_filter_coeffs_fixed = (
0.000457763671875,
0.000946044921875,
0.00067138671875,
0.001068115234375,
0.00091552734375,
0.0008544921875,
0.000518798828125,
0.0001220703125,
-0.000396728515625,
-0.0008544921875,
-0.00128173828125,
-0.00146484375,
-0.001434326171875,
-0.0010986328125,
-0.000518798828125,
0.000274658203125,
0.001129150390625,
0.00189208984375,
0.00238037109375,
0.00250244140625,
0.002166748046875,
0.0013427734375,
0.000152587890625,
-0.001220703125,
-0.002532958984375,
-0.0035400390625,
-0.003997802734375,
-0.003753662109375,
-0.002777099609375,
-0.0010986328125,
0.000946044921875,
0.00311279296875,
0.00494384765625,
0.00604248046875,
0.006103515625,
0.005035400390625,
0.00286865234375,
-0.0001220703125,
-0.00347900390625,
-0.006561279296875,
-0.008758544921875,
-0.00958251953125,
-0.008636474609375,
-0.005950927734375,
-0.001739501953125,
0.00335693359375,
0.00848388671875,
0.0126953125,
0.01507568359375,
0.014862060546875,
0.01171875,
0.00579833984375,
-0.002227783203125,
-0.01123046875,
-0.0196533203125,
-0.02587890625,
-0.028228759765625,
-0.025421142578125,
-0.016754150390625,
-0.002166748046875,
0.017608642578125,
0.041015625,
0.0660400390625,
0.090240478515625,
0.111083984375,
0.12640380859375,
0.134490966796875,
0.134490966796875,
0.12640380859375,
0.111083984375,
0.090240478515625,
0.0660400390625,
0.041015625,
0.017608642578125,
-0.002166748046875,
-0.016754150390625,
-0.025421142578125,
-0.028228759765625,
-0.02587890625,
-0.0196533203125,
-0.01123046875,
-0.002227783203125,
0.00579833984375,
0.01171875,
0.014862060546875,
0.01507568359375,
0.0126953125,
0.00848388671875,
0.00335693359375,
-0.001739501953125,
-0.005950927734375,
-0.008636474609375,
-0.00958251953125,
-0.008758544921875,
-0.006561279296875,
-0.00347900390625,
-0.0001220703125,
0.00286865234375,
0.005035400390625,
0.006103515625,
0.00604248046875,
0.00494384765625,
0.00311279296875,
0.000946044921875,
-0.0010986328125,
-0.002777099609375,
-0.003753662109375,
-0.003997802734375,
-0.0035400390625,
-0.002532958984375,
-0.001220703125,
0.000152587890625,
0.0013427734375,
0.002166748046875,
0.00250244140625,
0.00238037109375,
0.00189208984375,
0.001129150390625,
0.000274658203125,
-0.000518798828125,
-0.0010986328125,
-0.001434326171875,
-0.00146484375,
-0.00128173828125,
-0.0008544921875,
-0.000396728515625,
0.0001220703125,
0.000518798828125,
0.0008544921875,
0.00091552734375,
0.001068115234375,
0.00067138671875,
0.000946044921875,
0.000457763671875)
#chan_filter = gr.interp_fir_filter_ccf(self._gr_interp, chan_filter_coeffs_fixed)
#chan_filter_dsp = gr.dsp_fir_ccf (chan_filter_coeffs_fixed, 14, self._gr_interp, 0, 0, 0, 1)
#r = gr.enable_realtime_scheduling ()
if self.DEBUG:
print "interpolation rate = ", self._gr_interp
# FM modulator
k = 2 * math.pi * self.tx_freq_deviation / self.gr_rate
modulator = gr.frequency_modulator_fc(k)
# Pre-emphasis for FM modulation
"""
tau is preemphasis time constant, inverse proportional to channel bandwidth
"""
chan_bw = 2.0*(self.tx_base_band_bw + \
self.tx_freq_deviation)# Carson's rule of FM channel bandwidth
tau = 1/(chan_bw * 0.5)
if self.DEBUG:
print " channel bandwidth: ", chan_bw
print " tau: ", tau
preemph = fm_preemph (self.gr_rate, tau)
# audio_coeffs = (
# 0.00058729130373770002,
# 0.0016584444738215582,
# 0.0015819269921330031,
# 0.0014607862142637573,
# 0.00020681278261230754,
#-0.0013001097961560814,
#-0.00249802658603143,
#-0.0024276134129972843,
#-0.00083069749014258953,
# 0.0017562878158492619,
# 0.003963761120687582,
# 0.0043075911442784871,
# 0.0020710872871114866,
#-0.0020172640629268932,
#-0.005882026963765212,
#-0.0070692053073845166,
#-0.0041954626649490937,
# 0.0019311082705710714,
# 0.0082980827342646387,
# 0.011045923787287403,
# 0.0076530405054369872,
#-0.0012102332109476402,
#-0.011372099802214802,
#-0.016910189774436514,
#-0.013347352799620162,
#-0.00068013535845177706,
# 0.015578754320259895,
# 0.026379517186832846,
# 0.023618496101893545,
# 0.0051085800414948012,
#-0.022608534445133374,
#-0.045529642916534545,
#-0.047580556152787695,
#-0.018048092177406189,
# 0.042354392363985506,
# 0.11988807809069109,
# 0.19189052073753335,
# 0.2351677633079737,
# 0.2351677633079737,
# 0.19189052073753335,
# 0.11988807809069109,
# 0.042354392363985506,
#-0.018048092177406189,
#-0.047580556152787695,
#-0.045529642916534545,
#-0.022608534445133374,
# 0.0051085800414948012,
# 0.023618496101893545,
# 0.026379517186832846,
# 0.015578754320259895,
#-0.00068013535845177706,
#-0.013347352799620162,
#-0.016910189774436514,
#-0.011372099802214802,
#-0.0012102332109476402,
# 0.0076530405054369872,
# 0.011045923787287403,
# 0.0082980827342646387,
# 0.0019311082705710714,
#-0.0041954626649490937,
#-0.0070692053073845166,
#-0.005882026963765212,
#-0.0020172640629268932,
# 0.0020710872871114866,
# 0.0043075911442784871,
# 0.003963761120687582,
# 0.0017562878158492619,
#-0.00083069749014258953,
#-0.0024276134129972843,
#-0.00249802658603143,
#-0.0013001097961560814,
# 0.00020681278261230754,
# 0.0014607862142637573,
# 0.0015819269921330031,
# 0.0016584444738215582,
# 0.00058729130373770002)
audio_coeffs = (
-0.021392822265625,
-0.0194091796875,
0.02972412109375,
-0.018341064453125,
-0.025299072265625,
0.07745361328125,
-0.08251953125,
-0.033905029296875,
0.56634521484375,
0.56634521484375,
-0.033905029296875,
-0.08251953125,
0.07745361328125,
-0.025299072265625,
-0.018341064453125,
0.02972412109375,
-0.0194091796875,
-0.021392822265625)
#audio_coeffs = (
# -0.21392822265625,
# -0.194091796875,
# 0.2972412109375,
# -0.18341064453125,
# -0.25299072265625,
# 0.7745361328125,
# -0.8251953125,
# -0.33905029296875,
# 5.6634521484375,
# 5.6634521484375,
# -0.33905029296875,
# -0.8251953125,
# 0.7745361328125,
# -0.25299072265625,
# -0.18341064453125,
# 0.2972412109375,
# -0.194091796875,
# -0.21392822265625)
self.audio_filter = gr.interp_fir_filter_fff(self._gr_interp, audio_coeffs)
#Source audio Low-pass Filter
#self.audio_throt = gr.multiply_const_ff(50)
self.audio_throt = gr.multiply_const_ff(5)
if self.DEBUG:
print "audio decim FIR filter tap length:", len(audio_coeffs)
# Setup audio source
src = audio.source(int(self.audio_rate), audio_input)
# Wiring up
#self.connect(src, self.audio_throt, interpolator, preemph, modulator, chan_filter_dsp, self.gr_amp, self.u)
self.connect(src, self.audio_throt, self.audio_filter, modulator, self.gr_amp, self.u)
def _setup_uhd(self):
self._u = uhd.single_usrp_sink(self._ip_addr,
io_type=uhd.io_type_t.COMPLEX_FLOAT32,
num_channels=1)
def __init__(self, freq, subdev_spec, which_USRP, audio_input, debug):
#gr.hier_block2.__init__(self, "analog_transmit_path",
# gr.io_signature(0, 0, 0), #input signature
# gr.io_signature(0, 0, 0)) #output signature
gr.top_block.__init__(self)
self.DEBUG = debug
self.freq = freq
#self.freq = 462562500
# audio_input="hw:0"
#Formerly from XML
self.tx_usrp_pga_gain_scaling = 1.0
self.tx_power = 1
self.tx_mod_type = 'fm'
self.tx_freq_deviation = 2.5e3
self.tx_base_band_bw = 5e3
################## USRP settings ###################
r = gr.enable_realtime_scheduling()
# acquire USRP via USB 2.0
#self.u = usrp.sink_c(fusb_block_size=1024,
# fusb_nblocks=4,
# which=which_USRP)
self.u = uhd.single_usrp_sink(
device_addr="",
io_type=uhd.io_type_t.COMPLEX_FLOAT32,
num_channels=1,
)
# get D/A converter sampling rate
#self.dac_rate = self.u.dac_rate() #128 MS/s
self.dac_rate = 128e6 #128 MS/s
if self.DEBUG:
print " Tx Path DAC rate: %d" % (self.dac_rate)
#System digital sample rate setting
self.audio_rate = 16e3
self._gr_interp = 16
self.max_gr_interp_rate = 40
self._usrp_interp = 500
self.gr_rate = self.dac_rate / self._usrp_interp
self._gr_decim = 1
if self.DEBUG:
print " usrp interp: ", self._usrp_interp
print " gr interp: ", self._gr_interp
print " gr rate1: ", self.gr_rate
print " gr decim: ", self._gr_decim
print " audio rate: ", self.audio_rate
# set USRP interplation ratio
#self.u.set_interp_rate(self._usrp_interp)
self.u.set_samp_rate(self.gr_rate)
# set USRP daughterboard subdevice
#if subdev_spec is None:
# subdev_spec = usrp.pick_tx_subdevice(self.u)
#self.u.set_mux(usrp.determine_tx_mux_value(self.u, subdev_spec))
#self.subdev = usrp.selected_subdev(self.u, subdev_spec)
self.u.set_antenna("TX/RX")
#if self.DEBUG:
# print " TX Path use daughterboard: %s" % (self.subdev.side_and_name())
# Set center frequency of USRP
"""
Set the center frequency we're interested in.
Tuning is a two step process. First we ask the front-end to
tune as close to the desired frequency as it can. Then we use
the result of that operation and our target_frequency to
determine the value for the digital up converter.
"""
assert (self.freq != None)
#r = self.u.tune(self.subdev.which(), self.subdev, self.freq)
r = self.u.set_center_freq(self.freq, 0)
if self.DEBUG:
if r:
print " Tx Frequency: %s" % (eng_notation.num_to_str(
self.freq))
else:
print "----Failed to set Tx frequency to %s" % (
eng_notation.num_to_str(self.freq), )
raise ValueError
# Set the USRP Tx PGA gain, (Note that on the RFX cards this is a nop.)
# subdev.set_gain(subdev.gain_range()[1]) # set max Tx gain
#g = self.subdev.gain_range()
g = self.u.get_gain_range(0)
#_tx_usrp_gain_range = g[1]-g[0]
_tx_usrp_gain_range = g
#_tx_usrp_gain = g[0] + _tx_usrp_gain_range * self.tx_usrp_pga_gain_scaling
#_tx_usrp_gain = g + _tx_usrp_gain_range * self.tx_usrp_pga_gain_scaling
#self.subdev.set_gain(_tx_usrp_gain)
#self.u.set_gain(_tx_usrp_gain, 0)
self.u.set_gain(10, 0)
#if self.DEBUG:
# print " USRP Tx PGA Gain Range: min = %g, max = %g, step size = %g" \
# %(g[0], g[1], g[2])
# print " USRP Tx PGA gain set to: %g" %(_tx_usrp_gain)
# Set the transmit amplitude sent to the USRP (param: ampl 0 <= ampl < 16384.)
"""
Convert tx_power(mW) in waveform.xml to amplitude in gnu radio
"""
ampl = 1638.3 * pow(self.tx_power, 0.5)
self.tx_amplitude = max(0.0, min(ampl, 16383.0))
if self.DEBUG:
print "tx amplitude:", self.tx_amplitude
#gr digital amplifier
self.tx_amplitude = 1.0
self.gr_amp = gr.multiply_const_cc(int(
self.tx_amplitude)) # software amplifier (scaler)
print "GR amp= ", int(self.tx_amplitude)
if self.DEBUG:
print " Tx power acquired from waveform configuration XML file is: %f between (0, 100.0mW)" % (
self.tx_power)
print " Tx Path initial software signal amplitude to USRP: %f / 16383.0" % (
ampl)
print " Tx Path actual software signal amplitude to USRP: %f / 16383.0" % (
self.tx_amplitude)
################## Choose the corresponding analog modem ###################
if self.DEBUG:
print "----Tx path modulation: %s" % (self.tx_mod_type)
chan_filter_coeffs_fixed = (
0.000457763671875, 0.000946044921875, 0.00067138671875,
0.001068115234375, 0.00091552734375, 0.0008544921875,
0.000518798828125, 0.0001220703125, -0.000396728515625,
-0.0008544921875, -0.00128173828125, -0.00146484375,
-0.001434326171875, -0.0010986328125, -0.000518798828125,
0.000274658203125, 0.001129150390625, 0.00189208984375,
0.00238037109375, 0.00250244140625, 0.002166748046875,
0.0013427734375, 0.000152587890625, -0.001220703125,
-0.002532958984375, -0.0035400390625, -0.003997802734375,
-0.003753662109375, -0.002777099609375, -0.0010986328125,
0.000946044921875, 0.00311279296875, 0.00494384765625,
0.00604248046875, 0.006103515625, 0.005035400390625,
0.00286865234375, -0.0001220703125, -0.00347900390625,
-0.006561279296875, -0.008758544921875, -0.00958251953125,
-0.008636474609375, -0.005950927734375, -0.001739501953125,
0.00335693359375, 0.00848388671875, 0.0126953125, 0.01507568359375,
0.014862060546875, 0.01171875, 0.00579833984375,
-0.002227783203125, -0.01123046875, -0.0196533203125,
-0.02587890625, -0.028228759765625, -0.025421142578125,
-0.016754150390625, -0.002166748046875, 0.017608642578125,
0.041015625, 0.0660400390625, 0.090240478515625, 0.111083984375,
0.12640380859375, 0.134490966796875, 0.134490966796875,
0.12640380859375, 0.111083984375, 0.090240478515625,
0.0660400390625, 0.041015625, 0.017608642578125,
-0.002166748046875, -0.016754150390625, -0.025421142578125,
-0.028228759765625, -0.02587890625, -0.0196533203125,
-0.01123046875, -0.002227783203125, 0.00579833984375, 0.01171875,
0.014862060546875, 0.01507568359375, 0.0126953125,
0.00848388671875, 0.00335693359375, -0.001739501953125,
-0.005950927734375, -0.008636474609375, -0.00958251953125,
-0.008758544921875, -0.006561279296875, -0.00347900390625,
-0.0001220703125, 0.00286865234375, 0.005035400390625,
0.006103515625, 0.00604248046875, 0.00494384765625,
0.00311279296875, 0.000946044921875, -0.0010986328125,
-0.002777099609375, -0.003753662109375, -0.003997802734375,
-0.0035400390625, -0.002532958984375, -0.001220703125,
0.000152587890625, 0.0013427734375, 0.002166748046875,
0.00250244140625, 0.00238037109375, 0.00189208984375,
0.001129150390625, 0.000274658203125, -0.000518798828125,
-0.0010986328125, -0.001434326171875, -0.00146484375,
-0.00128173828125, -0.0008544921875, -0.000396728515625,
0.0001220703125, 0.000518798828125, 0.0008544921875,
0.00091552734375, 0.001068115234375, 0.00067138671875,
0.000946044921875, 0.000457763671875)
#chan_filter = gr.interp_fir_filter_ccf(self._gr_interp, chan_filter_coeffs_fixed)
#chan_filter_dsp = gr.dsp_fir_ccf (chan_filter_coeffs_fixed, 14, self._gr_interp, 0, 0, 0, 1)
#r = gr.enable_realtime_scheduling ()
if self.DEBUG:
print "interpolation rate = ", self._gr_interp
# FM modulator
k = 2 * math.pi * self.tx_freq_deviation / self.gr_rate
modulator = gr.frequency_modulator_fc(k)
# Pre-emphasis for FM modulation
"""
tau is preemphasis time constant, inverse proportional to channel bandwidth
"""
chan_bw = 2.0*(self.tx_base_band_bw + \
self.tx_freq_deviation)# Carson's rule of FM channel bandwidth
tau = 1 / (chan_bw * 0.5)
if self.DEBUG:
print " channel bandwidth: ", chan_bw
print " tau: ", tau
preemph = fm_preemph(self.gr_rate, tau)
# audio_coeffs = (
# 0.00058729130373770002,
# 0.0016584444738215582,
# 0.0015819269921330031,
# 0.0014607862142637573,
# 0.00020681278261230754,
#-0.0013001097961560814,
#-0.00249802658603143,
#-0.0024276134129972843,
#-0.00083069749014258953,
# 0.0017562878158492619,
# 0.003963761120687582,
# 0.0043075911442784871,
# 0.0020710872871114866,
#-0.0020172640629268932,
#-0.005882026963765212,
#-0.0070692053073845166,
#-0.0041954626649490937,
# 0.0019311082705710714,
# 0.0082980827342646387,
# 0.011045923787287403,
# 0.0076530405054369872,
#-0.0012102332109476402,
#-0.011372099802214802,
#-0.016910189774436514,
#-0.013347352799620162,
#-0.00068013535845177706,
# 0.015578754320259895,
# 0.026379517186832846,
# 0.023618496101893545,
# 0.0051085800414948012,
#-0.022608534445133374,
#-0.045529642916534545,
#-0.047580556152787695,
#-0.018048092177406189,
# 0.042354392363985506,
# 0.11988807809069109,
# 0.19189052073753335,
# 0.2351677633079737,
# 0.2351677633079737,
# 0.19189052073753335,
# 0.11988807809069109,
# 0.042354392363985506,
#-0.018048092177406189,
#-0.047580556152787695,
#-0.045529642916534545,
#-0.022608534445133374,
# 0.0051085800414948012,
# 0.023618496101893545,
# 0.026379517186832846,
# 0.015578754320259895,
#-0.00068013535845177706,
#-0.013347352799620162,
#-0.016910189774436514,
#-0.011372099802214802,
#-0.0012102332109476402,
# 0.0076530405054369872,
# 0.011045923787287403,
# 0.0082980827342646387,
# 0.0019311082705710714,
#-0.0041954626649490937,
#-0.0070692053073845166,
#-0.005882026963765212,
#-0.0020172640629268932,
# 0.0020710872871114866,
# 0.0043075911442784871,
# 0.003963761120687582,
# 0.0017562878158492619,
#-0.00083069749014258953,
#-0.0024276134129972843,
#-0.00249802658603143,
#-0.0013001097961560814,
# 0.00020681278261230754,
# 0.0014607862142637573,
# 0.0015819269921330031,
# 0.0016584444738215582,
# 0.00058729130373770002)
audio_coeffs = (-0.021392822265625, -0.0194091796875, 0.02972412109375,
-0.018341064453125, -0.025299072265625,
0.07745361328125, -0.08251953125, -0.033905029296875,
0.56634521484375, 0.56634521484375, -0.033905029296875,
-0.08251953125, 0.07745361328125, -0.025299072265625,
-0.018341064453125, 0.02972412109375, -0.0194091796875,
-0.021392822265625)
#audio_coeffs = (
# -0.21392822265625,
# -0.194091796875,
# 0.2972412109375,
# -0.18341064453125,
# -0.25299072265625,
# 0.7745361328125,
# -0.8251953125,
# -0.33905029296875,
# 5.6634521484375,
# 5.6634521484375,
# -0.33905029296875,
# -0.8251953125,
# 0.7745361328125,
# -0.25299072265625,
# -0.18341064453125,
# 0.2972412109375,
# -0.194091796875,
# -0.21392822265625)
self.audio_filter = gr.interp_fir_filter_fff(self._gr_interp,
audio_coeffs)
#Source audio Low-pass Filter
#self.audio_throt = gr.multiply_const_ff(50)
self.audio_throt = gr.multiply_const_ff(5)
if self.DEBUG:
print "audio decim FIR filter tap length:", len(audio_coeffs)
# Setup audio source
src = audio.source(int(self.audio_rate), audio_input)
# Wiring up
#self.connect(src, self.audio_throt, interpolator, preemph, modulator, chan_filter_dsp, self.gr_amp, self.u)
self.connect(src, self.audio_throt, self.audio_filter, modulator,
self.gr_amp, self.u)