def __init__(self, dab_params):
gr.hier_block2.__init__(
self,
"fic_encode",
gr.io_signature(1, 1, gr.sizeof_char),
# Input signature
gr.io_signature(1, 1, gr.sizeof_char))
# Output signature
self.dp = dab_params
# crc
self.unpacked_to_packed_crc = blocks.unpacked_to_packed_bb_make(
1, gr.GR_MSB_FIRST)
self.s2v_crc = blocks.stream_to_vector(gr.sizeof_char, 32)
self.crc16 = dab.crc16_bb(32, 0x1021, 0xffff)
self.v2s_crc = blocks.vector_to_stream(gr.sizeof_char, 32)
self.packed_to_unpacked_crc = blocks.packed_to_unpacked_bb_make(
1, gr.GR_MSB_FIRST)
# energy dispersal
self.prbs_src = blocks.vector_source_b(
self.dp.prbs(self.dp.energy_dispersal_fic_vector_length), True)
self.add_mod_2 = blocks.xor_bb()
# convolutional encoder
self.conv_pack = blocks.unpacked_to_packed_bb_make(1, gr.GR_MSB_FIRST)
self.conv_encoder = dab.conv_encoder_bb_make(
self.dp.energy_dispersal_fic_vector_length / 8)
self.conv_unpack = blocks.packed_to_unpacked_bb_make(
1, gr.GR_MSB_FIRST)
# puncturing
self.puncture = dab.puncture_bb_make(
self.dp.assembled_fic_puncturing_sequence)
# pack bits
self.unpacked_to_packed_encoded = blocks.unpacked_to_packed_bb_make(
1, gr.GR_MSB_FIRST)
# connect everything
self.connect((self, 0), self.unpacked_to_packed_crc, self.s2v_crc,
self.crc16, self.v2s_crc, self.packed_to_unpacked_crc,
(self.add_mod_2, 0), self.conv_pack, self.conv_encoder,
self.conv_unpack, self.puncture,
self.unpacked_to_packed_encoded, self)
#connect prbs
self.connect(self.prbs_src, (self.add_mod_2, 1))
def __init__(self, dab_params, bit_rate, address, subch_size, protection, output_float, verbose=False, debug=False):
if output_float: # map short samples to the range [-1,1] in floats
gr.hier_block2.__init__(self,
"dab_audio_decoder_ff",
# Input signature
gr.io_signature(1, 1, gr.sizeof_float * dab_params.num_carriers * 2),
# Output signature
gr.io_signature2(2, 2, gr.sizeof_float, gr.sizeof_float))
else: # output signed 16 bit integers (directly from decoder)
gr.hier_block2.__init__(self,
"dab_audio_decoder_ff",
# Input signature
gr.io_signature(1, 1, gr.sizeof_float * dab_params.num_carriers * 2),
# Output signature
gr.io_signature2(2, 2, gr.sizeof_short, gr.sizeof_short))
self.msc_dec = grdab.msc_decode(dab_params, address, subch_size, protection)
self.unpack = blocks.packed_to_unpacked_bb_make(1, gr.GR_MSB_FIRST)
self.mp2_dec = grdab.mp2_decode_bs_make(bit_rate / 8)
self.connect((self, 0), self.msc_dec, self.unpack, self.mp2_dec)
if output_float:
# map short samples to the range [-1,1] in floats
self.s2f_left = blocks.short_to_float_make(1, 32767)
self.s2f_right = blocks.short_to_float_make(1, 32767)
self.gain_left = blocks.multiply_const_ff(1, 1)
self.gain_right = blocks.multiply_const_ff(1, 1)
self.connect((self.mp2_dec, 0), self.s2f_left, self.gain_left, (self, 0))
self.connect((self.mp2_dec, 1), self.s2f_right, self.gain_right, (self, 1))
else:
# output signed 16 bit integers (directly from decoder)
self.connect((self.mp2_dec, 0), (self, 0))
self.connect((self.mp2_dec, 1), (self, 1))
def test_001_t (self):
log = gr.logger("log")
if os.path.exists("debug/rs_encoded.dat") and os.path.exists("debug/rs_encoded.dat"):
self.dp = dab.parameters.dab_parameters(1, 208.064e6, True)
# sources
self.fib_src = dab.fib_source_b_make(1, 1, 'Galaxy_News', 'Wasteland_Radio', 'Country_Mix01', 0x09, [2], [14])
self.fib_pack = blocks.unpacked_to_packed_bb_make(1, gr.GR_MSB_FIRST)
self.subch_src01 = blocks.file_source_make(gr.sizeof_char, "debug/rs_encoded.dat", True)
self.subch_src02 = blocks.file_source_make(gr.sizeof_char, "debug/rs_encoded_2.dat", True)
# encoder
self.fib_enc = dab.fic_encode(self.dp)
self.msc_encoder = dab.msc_encode(self.dp, 14, 2)
self.msc_encoder2 = dab.msc_encode(self.dp, 14, 2)
# multiplexer
self.mux = dab.dab_transmission_frame_mux_bb_make(1, 2, [84, 84])
# mapper
self.unpack = blocks.packed_to_unpacked_bb_make(1, gr.GR_MSB_FIRST)
self.map = dab.mapper_bc_make(self.dp.num_carriers)
# demapper
self.s2v = blocks.stream_to_vector_make(gr.sizeof_gr_complex, self.dp.num_carriers)
self.soft_interleaver = dab.complex_to_interleaved_float_vcf_make(self.dp.num_carriers)
# decode
self.fic_decoder = dab.fic_decode(self.dp)
self.msc_dec = dab.dabplus_audio_decoder_ff(self.dp, 112, 0, 84, 2, True)
# audio sink
self.audio = audio.sink_make(32000)
# control stream
self.trigger_src = blocks.vector_source_b([1] + [0] * 74, True)
# connect everything
self.tb.connect(self.fib_src, self.fib_enc, (self.mux, 0))
self.tb.connect(self.subch_src01, self.msc_encoder, (self.mux, 1))
self.tb.connect(self.subch_src02, self.msc_encoder2, (self.mux, 2))
self.tb.connect((self.mux, 0), self.unpack, self.map, self.s2v, self.soft_interleaver, (self.msc_dec, 0))
self.tb.connect(self.soft_interleaver, (self.fic_decoder, 0))
self.tb.connect(self.trigger_src, (self.fic_decoder, 1))
self.tb.connect(self.trigger_src, (self.msc_dec, 1))
self.tb.connect((self.msc_dec, 0), (self.audio, 0))
self.tb.connect((self.msc_dec, 1), (self.audio, 1))
self.tb.run ()
pass
else:
log.debug("debug file not found - skipped test")
log.set_level("WARN")
pass
def test_001_t (self):
if os.path.exists("debug/mp2_encoded.dat"):
self.src_mp2 = blocks.file_source_make(gr.sizeof_char, "debug/mp2_encoded.dat")
self.unpack = blocks.packed_to_unpacked_bb_make(1, gr.GR_MSB_FIRST)
self.mp2_decode = grdab.mp2_decode_bs_make(14)
self.sink_left = blocks.file_sink_make(gr.sizeof_short, "debug/mp2_decoded_left.dat")
self.sink_right = blocks.file_sink_make(gr.sizeof_short, "debug/mp2_decoded_right.dat")
self.tb.connect(self.src_mp2, self.unpack, (self.mp2_decode, 0), self.sink_left)
self.tb.connect((self.mp2_decode, 1), self.sink_right)
self.tb.run()
else:
log = gr.logger("log")
log.debug("debug file not found - skipped test")
log.set_level("WARN")
pass
def __init__(self,
dab_params,
bit_rate,
address,
subch_size,
protection,
output_float,
verbose=False,
debug=False):
if output_float: # map short samples to the range [-1,1] in floats
gr.hier_block2.__init__(
self,
"dab_audio_decoder_ff",
# Input signature
gr.io_signature(1, 1,
gr.sizeof_float * dab_params.num_carriers * 2),
# Output signature
gr.io_signature2(2, 2, gr.sizeof_float, gr.sizeof_float))
else: # output signed 16 bit integers (directly from decoder)
gr.hier_block2.__init__(
self,
"dab_audio_decoder_ff",
# Input signature
gr.io_signature(1, 1,
gr.sizeof_float * dab_params.num_carriers * 2),
# Output signature
gr.io_signature2(2, 2, gr.sizeof_short, gr.sizeof_short))
self.msc_dec = grdab.msc_decode(dab_params, address, subch_size,
protection)
self.unpack = blocks.packed_to_unpacked_bb_make(1, gr.GR_MSB_FIRST)
self.mp2_dec = grdab.mp2_decode_bs_make(bit_rate / 8)
self.connect((self, 0), self.msc_dec, self.unpack, self.mp2_dec)
if output_float:
# map short samples to the range [-1,1] in floats
self.s2f_left = blocks.short_to_float_make(1, 32767)
self.s2f_right = blocks.short_to_float_make(1, 32767)
self.gain_left = blocks.multiply_const_ff(1, 1)
self.gain_right = blocks.multiply_const_ff(1, 1)
self.connect((self.mp2_dec, 0), self.s2f_left, self.gain_left,
(self, 0))
self.connect((self.mp2_dec, 1), self.s2f_right, self.gain_right,
(self, 1))
else:
# output signed 16 bit integers (directly from decoder)
self.connect((self.mp2_dec, 0), (self, 0))
self.connect((self.mp2_dec, 1), (self, 1))
def test_001_t(self):
if os.path.exists("debug/mp2_encoded.dat"):
self.src_mp2 = blocks.file_source_make(gr.sizeof_char,
"debug/mp2_encoded.dat")
self.unpack = blocks.packed_to_unpacked_bb_make(1, gr.GR_MSB_FIRST)
self.mp2_decode = dab.mp2_decode_bs_make(14)
self.sink_left = blocks.file_sink_make(
gr.sizeof_short, "debug/mp2_decoded_left.dat")
self.sink_right = blocks.file_sink_make(
gr.sizeof_short, "debug/mp2_decoded_right.dat")
self.tb.connect(self.src_mp2, self.unpack, (self.mp2_decode, 0),
self.sink_left)
self.tb.connect((self.mp2_decode, 1), self.sink_right)
self.tb.run()
else:
log = gr.logger("log")
log.debug("debug file not found - skipped test")
log.set_level("WARN")
pass
def test_001_t (self):
self.symbol_length = 32*4
self.dab_params = dab_parameters(1, 208.064e6, True)
# source
self.dp = dab_parameters(1, 208.064e6, True)
self.fib_src = dab.fib_source_b_make(1, 1, 1, "ensemble1", "service1 ", "musicmix", 4, [2], [15], [1])
# encoder
self.fib_enc = fic_encode(self.dab_params)
self.unpack = blocks.packed_to_unpacked_bb_make(1, gr.GR_MSB_FIRST)
# mapper
self.map = dab.mapper_bc_make(self.dp.num_carriers)
# demapper
self.s2v = blocks.stream_to_vector_make(gr.sizeof_gr_complex, self.dp.num_carriers)
self.soft_interleaver = dab.complex_to_interleaved_float_vcf_make(self.dp.num_carriers)
# decode
self.fic_decoder = fic_decode(self.dab_params)
# control stream
self.trigger_src = blocks.vector_source_b([1] + [0]*74, True)
self.tb.connect(self.fib_src,
blocks.head_make(gr.sizeof_char, 100000),
self.fib_enc,
self.unpack,
self.map,
self.s2v,
self.soft_interleaver,
self.fic_decoder
)
self.tb.connect(self.trigger_src, (self.fic_decoder, 1))
self.tb.run ()
pass
def __init__(self, dab_params, data_rate_n, protection):
gr.hier_block2.__init__(self,
"msc_encode",
gr.io_signature(1, 1, gr.sizeof_char), # Input signature
gr.io_signature(1, 1, gr.sizeof_char)) # Output signature
self.dp = dab_params
self.n = data_rate_n
self.msc_I = self.n * 192
self.protect = protection
# unpack
self.unpack = blocks.packed_to_unpacked_bb_make(1, gr.GR_MSB_FIRST)
# energy dispersal
self.prbs_src = blocks.vector_source_b(self.dp.prbs(self.msc_I), True)
self.add_mod_2 = blocks.xor_bb()
# convolutional encoder
self.conv_pack = blocks.unpacked_to_packed_bb_make(1, gr.GR_MSB_FIRST)
self.conv_encoder = dab.conv_encoder_bb_make(self.msc_I / 8)
self.conv_unpack = blocks.packed_to_unpacked_bb_make(1, gr.GR_MSB_FIRST)
# calculate puncturing factors (EEP, table 33, 34)
if (self.n > 1 or self.protect != 1):
self.puncturing_L1 = [6 * self.n - 3, 2 * self.n - 3, 6 * self.n - 3, 4 * self.n - 3]
self.puncturing_L2 = [3, 4 * self.n + 3, 3, 2 * self.n + 3]
self.puncturing_PI1 = [24, 14, 8, 3]
self.puncturing_PI2 = [23, 13, 7, 2]
# calculate length of punctured codeword (11.3.2)
self.msc_punctured_codeword_length = self.puncturing_L1[self.protect] * 4 * self.dp.puncturing_vectors_ones[
self.puncturing_PI1[self.protect]] + self.puncturing_L2[self.protect] * 4 * \
self.dp.puncturing_vectors_ones[
self.puncturing_PI2[self.protect]] + 12
self.assembled_msc_puncturing_sequence = self.puncturing_L1[self.protect] * 4 * self.dp.puncturing_vectors[
self.puncturing_PI1[self.protect]] + self.puncturing_L2[self.protect] * 4 * self.dp.puncturing_vectors[
self.puncturing_PI2[self.protect]] + self.dp.puncturing_tail_vector
self.msc_conv_codeword_length = 4 * self.msc_I + 24 # 4*I + 24 ()
# exception in table
else:
self.msc_punctured_codeword_length = 5 * 4 * self.dp.puncturing_vectors_ones[13] + 1 * 4 * \
self.dp.puncturing_vectors_ones[
12] + 12
# sanity check
assert (6 * self.n == self.puncturing_L1[self.protect] + self.puncturing_L2[self.protect])
# puncturing
self.puncture = dab.puncture_bb_make(self.assembled_msc_puncturing_sequence)
# time interleaving
self.s2v_time_interleave = blocks.stream_to_vector_make(gr.sizeof_char, self.msc_punctured_codeword_length)
self.time_interleaver = dab.time_interleave_bb_make(self.msc_punctured_codeword_length, self.dp.scrambling_vector)
self.v2s_time_interleave = blocks.vector_to_stream_make(gr.sizeof_char, self.msc_punctured_codeword_length)
# pack bits
self.unpacked_to_packed_encoded = blocks.unpacked_to_packed_bb_make(1, gr.GR_MSB_FIRST)
# connect everything
self.connect(self,
self.unpack,
self.add_mod_2,
self.conv_pack,
self.conv_encoder,
self.conv_unpack,
self.puncture,
self.s2v_time_interleave,
self.time_interleaver,
self.v2s_time_interleave,
self.unpacked_to_packed_encoded,
self)
# connect prbs
self.connect(self.prbs_src, (self.add_mod_2, 1))
def __init__(self, dab_params, verbose=False, debug=False):
"""
Hierarchical block for OFDM modulation
@param dab_params DAB parameter object (grdab.parameters.dab_parameters)
@param debug enables debug output to files
"""
dp = dab_params
gr.hier_block2.__init__(
self,
"ofdm_mod",
gr.io_signature2(2, 2, gr.sizeof_char * dp.num_carriers / 4,
gr.sizeof_char), # input signature
gr.io_signature(1, 1, gr.sizeof_gr_complex)) # output signature
# symbol mapping
self.mapper_v2s = blocks.vector_to_stream_make(gr.sizeof_char, 384)
self.mapper_unpack = blocks.packed_to_unpacked_bb_make(
1, gr.GR_MSB_FIRST)
self.mapper = grdab.mapper_bc_make(dp.num_carriers)
self.mapper_s2v = blocks.stream_to_vector_make(gr.sizeof_gr_complex,
1536)
# add pilot symbol
self.insert_pilot = grdab.ofdm_insert_pilot_vcc(dp.prn)
# phase sum
self.sum_phase = grdab.sum_phasor_trig_vcc(dp.num_carriers)
# frequency interleaving
self.interleave = grdab.frequency_interleaver_vcc(
dp.frequency_interleaving_sequence_array)
# add central carrier & move to middle
self.move_and_insert_carrier = grdab.ofdm_move_and_insert_zero(
dp.fft_length, dp.num_carriers)
# ifft
self.ifft = fft.fft_vcc(dp.fft_length, False, [], True)
# cyclic prefixer
self.prefixer = digital.ofdm_cyclic_prefixer(dp.fft_length,
dp.symbol_length)
# convert back to vectors
self.s2v = blocks.stream_to_vector(gr.sizeof_gr_complex,
dp.symbol_length)
# add null symbol
self.insert_null = grdab.insert_null_symbol(dp.ns_length,
dp.symbol_length)
#
# connect it all
#
# data
self.connect((self, 0), self.mapper_v2s, self.mapper_unpack,
self.mapper, self.mapper_s2v, (self.insert_pilot, 0),
(self.sum_phase, 0), self.interleave,
self.move_and_insert_carrier, self.ifft, self.prefixer,
self.s2v, (self.insert_null, 0))
self.connect(self.insert_null, self)
# control signal (frame start)
self.connect((self, 1), (self.insert_pilot, 1), (self.sum_phase, 1),
(self.insert_null, 1))
if debug:
#self.connect(self.mapper, blocks.file_sink(gr.sizeof_gr_complex*dp.num_carriers, "debug/generated_signal_mapper.dat"))
self.connect(
self.insert_pilot,
blocks.file_sink(gr.sizeof_gr_complex * dp.num_carriers,
"debug/generated_signal_insert_pilot.dat"))
self.connect(
self.sum_phase,
blocks.file_sink(gr.sizeof_gr_complex * dp.num_carriers,
"debug/generated_signal_sum_phase.dat"))
self.connect(
self.interleave,
blocks.file_sink(gr.sizeof_gr_complex * dp.num_carriers,
"debug/generated_signal_interleave.dat"))
self.connect(
self.move_and_insert_carrier,
blocks.file_sink(
gr.sizeof_gr_complex * dp.fft_length,
"debug/generated_signal_move_and_insert_carrier.dat"))
self.connect(
self.ifft,
blocks.file_sink(gr.sizeof_gr_complex * dp.fft_length,
"debug/generated_signal_ifft.dat"))
self.connect(
self.prefixer,
blocks.file_sink(gr.sizeof_gr_complex,
"debug/generated_signal_prefixer.dat"))
self.connect(
self.insert_null,
blocks.file_sink(gr.sizeof_gr_complex,
"debug/generated_signal.dat"))
def __init__(self, dab_params, verbose=False, debug=False): """ Hierarchical block for OFDM modulation @param dab_params DAB parameter object (grdab.parameters.dab_parameters) @param debug enables debug output to files """ dp = dab_params gr.hier_block2.__init__(self,"ofdm_mod", gr.io_signature2(2, 2, gr.sizeof_char*dp.num_carriers/4, gr.sizeof_char), # input signature gr.io_signature (1, 1, gr.sizeof_gr_complex)) # output signature # symbol mapping self.mapper_v2s = blocks.vector_to_stream_make(gr.sizeof_char, 384) self.mapper_unpack = blocks.packed_to_unpacked_bb_make(1, gr.GR_MSB_FIRST) self.mapper = grdab.mapper_bc_make(dp.num_carriers) self.mapper_s2v = blocks.stream_to_vector_make(gr.sizeof_gr_complex, 1536) # add pilot symbol self.insert_pilot = grdab.ofdm_insert_pilot_vcc(dp.prn) # phase sum self.sum_phase = grdab.sum_phasor_trig_vcc(dp.num_carriers) # frequency interleaving self.interleave = grdab.frequency_interleaver_vcc(dp.frequency_interleaving_sequence_array) # add central carrier & move to middle self.move_and_insert_carrier = grdab.ofdm_move_and_insert_zero(dp.fft_length, dp.num_carriers) # ifft self.ifft = fft.fft_vcc(dp.fft_length, False, [], True) # cyclic prefixer self.prefixer = digital.ofdm_cyclic_prefixer(dp.fft_length, dp.symbol_length) # convert back to vectors self.s2v = blocks.stream_to_vector(gr.sizeof_gr_complex, dp.symbol_length) # add null symbol self.insert_null = grdab.insert_null_symbol(dp.ns_length, dp.symbol_length) # # connect it all # # data self.connect((self,0), self.mapper_v2s, self.mapper_unpack, self.mapper, self.mapper_s2v, (self.insert_pilot,0), (self.sum_phase,0), self.interleave, self.move_and_insert_carrier, self.ifft, self.prefixer, self.s2v, (self.insert_null,0)) self.connect(self.insert_null, self) # control signal (frame start) self.connect((self,1), (self.insert_pilot,1), (self.sum_phase,1), (self.insert_null,1)) if debug: #self.connect(self.mapper, blocks.file_sink(gr.sizeof_gr_complex*dp.num_carriers, "debug/generated_signal_mapper.dat")) self.connect(self.insert_pilot, blocks.file_sink(gr.sizeof_gr_complex*dp.num_carriers, "debug/generated_signal_insert_pilot.dat")) self.connect(self.sum_phase, blocks.file_sink(gr.sizeof_gr_complex*dp.num_carriers, "debug/generated_signal_sum_phase.dat")) self.connect(self.interleave, blocks.file_sink(gr.sizeof_gr_complex*dp.num_carriers, "debug/generated_signal_interleave.dat")) self.connect(self.move_and_insert_carrier, blocks.file_sink(gr.sizeof_gr_complex*dp.fft_length, "debug/generated_signal_move_and_insert_carrier.dat")) self.connect(self.ifft, blocks.file_sink(gr.sizeof_gr_complex*dp.fft_length, "debug/generated_signal_ifft.dat")) self.connect(self.prefixer, blocks.file_sink(gr.sizeof_gr_complex, "debug/generated_signal_prefixer.dat")) self.connect(self.insert_null, blocks.file_sink(gr.sizeof_gr_complex, "debug/generated_signal.dat"))
def __init__(self,
dab_mode,
frequency,
bit_rate,
address,
size,
protection,
audio_bit_rate,
dabplus,
use_usrp,
src_path,
sink_path="None"):
gr.top_block.__init__(self)
self.dab_mode = dab_mode
self.verbose = False
self.sample_rate = 2e6
self.dabplus = dabplus
self.use_usrp = use_usrp
self.src_path = src_path
self.sink_path = sink_path
gr.log.set_level("warn")
########################
# source
########################
if self.use_usrp:
self.src = uhd.usrp_source("", uhd.io_type.COMPLEX_FLOAT32, 1)
self.src.set_samp_rate(self.sample_rate)
self.src.set_antenna("TX/RX")
else:
print "using file source"
self.src = blocks.file_source_make(gr.sizeof_gr_complex,
self.src_path, False)
# set paramters to default mode
self.softbits = True
self.filter_input = True
self.autocorrect_sample_rate = False
self.resample_fixed = 1
self.correct_ffe = True
self.equalize_magnitude = True
self.frequency = frequency
self.dab_params = dab.parameters.dab_parameters(
self.dab_mode, self.sample_rate, self.verbose)
self.rx_params = dab.parameters.receiver_parameters(
self.dab_mode, self.softbits, self.filter_input,
self.autocorrect_sample_rate, self.resample_fixed, self.verbose,
self.correct_ffe, self.equalize_magnitude)
########################
# FFT and waterfall plot
########################
self.fft_plot = qtgui.freq_sink_c_make(1024,
fft.window.WIN_BLACKMAN_HARRIS,
self.frequency, 2e6, "FFT")
self.waterfall_plot = qtgui.waterfall_sink_c_make(
1024, fft.window.WIN_BLACKMAN_HARRIS, self.frequency, 2e6,
"Waterfall")
#self.time_plot = qtgui.time_sink_c_make(1024, 2e6, "Time")
########################
# OFDM demod
########################
self.demod = dab.ofdm_demod(self.dab_params, self.rx_params,
self.verbose)
########################
# SNR measurement
########################
self.v2s_snr = blocks.vector_to_stream_make(
gr.sizeof_gr_complex, self.dab_params.num_carriers)
self.snr_measurement = digital.mpsk_snr_est_cc_make(
digital.SNR_EST_SIMPLE, 10000)
self.constellation_plot = qtgui.const_sink_c_make(1024, "", 1)
########################
# FIC decoder
########################
self.fic_dec = dab.fic_decode(self.dab_params)
########################
# MSC decoder
########################
if self.dabplus:
self.dabplus = dab.dabplus_audio_decoder_ff(
self.dab_params, bit_rate, address, size, protection, True)
else:
self.msc_dec = dab.msc_decode(self.dab_params, address, size,
protection)
self.unpack = blocks.packed_to_unpacked_bb_make(1, gr.GR_MSB_FIRST)
self.mp2_dec = dab.mp2_decode_bs_make(bit_rate / 8)
self.s2f_left = blocks.short_to_float_make(1, 32767)
self.s2f_right = blocks.short_to_float_make(1, 32767)
self.gain_left = blocks.multiply_const_ff(1, 1)
self.gain_right = blocks.multiply_const_ff(1, 1)
########################
# audio sink
########################
self.valve_left = dab.valve_ff_make(True)
self.valve_right = dab.valve_ff_make(True)
self.audio = audio.sink_make(audio_bit_rate)
self.wav_sink = blocks.wavfile_sink_make("dab_audio.wav", 2,
audio_bit_rate)
########################
# Connections
########################
self.connect(self.src, self.fft_plot)
self.connect(self.src, self.waterfall_plot)
self.connect(self.src, self.demod, (self.fic_dec, 0))
self.connect((self.demod, 1), (self.fic_dec, 1))
if self.dabplus:
self.connect((self.demod, 0), (self.dabplus, 0))
self.connect((self.demod, 1), (self.dabplus, 1))
else:
self.connect((self.demod, 0), (self.msc_dec, 0), self.unpack,
self.mp2_dec)
self.connect((self.demod, 1), (self.msc_dec, 1))
self.connect((self.mp2_dec, 0), self.s2f_left, self.gain_left)
self.connect((self.mp2_dec, 1), self.s2f_right, self.gain_right)
self.connect((self.demod, 0), self.v2s_snr, self.snr_measurement,
self.constellation_plot)
# connect audio to sound card and file sink
if self.dabplus:
self.connect((self.dabplus, 0), (self.audio, 0))
self.connect((self.dabplus, 1), (self.audio, 1))
self.connect((self.dabplus, 0), self.valve_left,
(self.wav_sink, 0))
self.connect((self.dabplus, 1), self.valve_right,
(self.wav_sink, 1))
else:
self.connect(self.gain_left, (self.audio, 0))
self.connect(self.gain_right, (self.audio, 1))
self.connect(self.gain_left, self.valve_left, (self.wav_sink, 0))
self.connect(self.gain_right, self.valve_right, (self.wav_sink, 1))
# tune USRP frequency
if self.use_usrp:
self.set_freq(self.frequency)
# set gain
# if no gain was specified, use the mid-point in dB
g = self.src.get_gain_range()
self.rx_gain = float(g.start() + g.stop()) / 2
self.src.set_gain(self.rx_gain)