def __init__(self, mode, input_rate, context):
channels = 2
audio_rate = 10000
gr.hier_block2.__init__(
self, str('%s demodulator' % (mode,)),
gr.io_signature(1, 1, gr.sizeof_gr_complex),
gr.io_signature(1, 1, gr.sizeof_float * channels))
self.__input_rate = input_rate
self.__rec_freq_input = 0.0
self.__signal_type = SignalType(kind='STEREO', sample_rate=audio_rate)
# Using agc2 rather than feedforward AGC for efficiency, because this runs at the RF rate rather than the audio rate.
agc_block = analog.agc2_cc(reference=dB(-8))
agc_block.set_attack_rate(8e-3)
agc_block.set_decay_rate(8e-3)
agc_block.set_max_gain(dB(40))
self.connect(
self,
agc_block)
channel_joiner = blocks.streams_to_vector(gr.sizeof_float, channels)
self.connect(channel_joiner, self)
for channel in xrange(0, channels):
self.connect(
agc_block,
grfilter.fir_filter_ccc(1, design_sawtooth_filter(decreasing=channel == 0)),
blocks.complex_to_mag(1),
blocks.float_to_complex(), # So we can use the complex-input band filter. TODO eliminate this for efficiency
MultistageChannelFilter(
input_rate=input_rate,
output_rate=audio_rate,
cutoff_freq=5000,
transition_width=5000),
blocks.complex_to_real(),
# assuming below 40Hz is not of interest
grfilter.dc_blocker_ff(audio_rate // 40, False),
(channel_joiner, channel))
def __init__(self, mode, input_rate, context):
channels = 2
audio_rate = 10000
gr.hier_block2.__init__(
self, str('%s demodulator' % (mode,)),
gr.io_signature(1, 1, gr.sizeof_gr_complex),
gr.io_signature(1, 1, gr.sizeof_float * channels))
self.__input_rate = input_rate
self.__rec_freq_input = 0.0
self.__signal_type = SignalType(kind='STEREO', sample_rate=audio_rate)
# Using agc2 rather than feedforward AGC for efficiency, because this runs at the RF rate rather than the audio rate.
agc_block = analog.agc2_cc(reference=dB(-8))
agc_block.set_attack_rate(8e-3)
agc_block.set_decay_rate(8e-3)
agc_block.set_max_gain(dB(40))
self.connect(
self,
agc_block)
channel_joiner = blocks.streams_to_vector(gr.sizeof_float, channels)
self.connect(channel_joiner, self)
for channel in six.moves.range(0, channels):
self.connect(
agc_block,
grfilter.fir_filter_ccc(1, design_sawtooth_filter(decreasing=channel == 0)),
blocks.complex_to_mag(1),
blocks.float_to_complex(), # So we can use the complex-input band filter. TODO eliminate this for efficiency
MultistageChannelFilter(
input_rate=input_rate,
output_rate=audio_rate,
cutoff_freq=5000,
transition_width=5000),
blocks.complex_to_real(),
# assuming below 40Hz is not of interest
grfilter.dc_blocker_ff(audio_rate // 40, False),
(channel_joiner, channel))
