def get_band_shape(self):
"""implement IDemodulator"""
return BandShape.bandpass_transition(
low=-self.__cutoff,
high=self.__cutoff,
transition=self.__transition_width,
)
def get_band_shape(self):
"""implement IDemodulator"""
return BandShape.bandpass_transition(
low=-self.__cutoff,
high=self.__cutoff,
transition=self.__transition_width,
)
def get_band_shape(self):
"""implement IDemodulator"""
return BandShape.bandpass_transition(
low=self.__low_cutoff,
high=self.__high_cutoff,
transition=self.__transition_width,
markers={
-self.__spacing: u'S',
0: u'M',
})
def get_band_shape(self):
"""implement IDemodulator"""
return BandShape.bandpass_transition(
low=self.__low_cutoff,
high=self.__high_cutoff,
transition=self.__transition_width,
markers={
-self.__spacing: u'S',
0: u'M',
})
def __init__(self, mode, **kwargs):
if mode == 'LSB':
lsb = True
cw = False
elif mode == 'USB':
lsb = False
cw = False
elif mode == 'CW':
lsb = False
cw = True
else:
raise ValueError('Not an SSB mode: %r' % (mode,))
demod_rate = 8000 # round number close to SSB bandwidth * 2
SimpleAudioDemodulator.__init__(self,
mode=mode,
audio_rate=demod_rate,
demod_rate=demod_rate,
band_filter=demod_rate / 2, # note narrower filter applied later
band_filter_transition=demod_rate / 2,
**kwargs)
if cw:
self.__offset = 1500 # CW beat frequency
half_bandwidth = self.half_bandwidth = 500
band_filter_width = 120
band_mid = 0
agc_reference = dB(-10)
agc_rate = 1e-1
else:
self.__offset = 0
half_bandwidth = self.half_bandwidth = 2800 / 2 # standard SSB bandwidth
band_filter_width = half_bandwidth / 5
if lsb:
band_mid = -200 - half_bandwidth
else:
band_mid = 200 + half_bandwidth
agc_reference = dB(-8)
agc_rate = 8e-1
band_filter_low = band_mid - half_bandwidth
band_filter_high = band_mid + half_bandwidth
sharp_filter_block = grfilter.fir_filter_ccc(
1,
firdes.complex_band_pass(1.0, demod_rate,
band_filter_low + self.__offset,
band_filter_high + self.__offset,
band_filter_width,
firdes.WIN_HAMMING))
self.__filter_shape = BandShape.bandpass_transition(
low=band_filter_low,
high=band_filter_high,
transition=band_filter_width,
markers={})
self.agc_block = analog.agc2_cc(reference=agc_reference)
self.agc_block.set_attack_rate(agc_rate)
self.agc_block.set_decay_rate(agc_rate)
self.agc_block.set_max_gain(dB(_ssb_max_agc))
ssb_demod_block = blocks.complex_to_real(1)
self.connect(
self,
self.band_filter_block,
sharp_filter_block,
# TODO: We would like to have a squelch which does not interfere with the AGC, but this is impossible without combining the squelch and AGC
self.rf_squelch_block,
self.agc_block,
ssb_demod_block)
self.connect(sharp_filter_block, self.rf_probe_block)
self.connect_audio_output(ssb_demod_block)
def __init__(self, mode, **kwargs):
if mode == 'LSB':
lsb = True
cw = False
elif mode == 'USB':
lsb = False
cw = False
elif mode == 'CW':
lsb = False
cw = True
else:
raise ValueError('Not an SSB mode: %r' % (mode, ))
demod_rate = 8000 # round number close to SSB bandwidth * 2
SimpleAudioDemodulator.__init__(
self,
mode=mode,
audio_rate=demod_rate,
demod_rate=demod_rate,
band_filter=demod_rate / 2, # note narrower filter applied later
band_filter_transition=demod_rate / 2,
**kwargs)
if cw:
self.__offset = 1500 # CW beat frequency
half_bandwidth = self.half_bandwidth = 500
band_filter_width = 120
band_mid = 0
agc_reference = dB(-10)
agc_rate = 1e-1
else:
self.__offset = 0
half_bandwidth = self.half_bandwidth = 2800 / 2 # standard SSB bandwidth
band_filter_width = half_bandwidth / 5
if lsb:
band_mid = -200 - half_bandwidth
else:
band_mid = 200 + half_bandwidth
agc_reference = dB(-8)
agc_rate = 8e-1
band_filter_low = band_mid - half_bandwidth
band_filter_high = band_mid + half_bandwidth
sharp_filter_block = grfilter.fir_filter_ccc(
1,
firdes.complex_band_pass(1.0, demod_rate,
band_filter_low + self.__offset,
band_filter_high + self.__offset,
band_filter_width, firdes.WIN_HAMMING))
self.__filter_shape = BandShape.bandpass_transition(
low=band_filter_low,
high=band_filter_high,
transition=band_filter_width,
markers={})
self.agc_block = analog.agc2_cc(reference=agc_reference)
self.agc_block.set_attack_rate(agc_rate)
self.agc_block.set_decay_rate(agc_rate)
self.agc_block.set_max_gain(dB(_ssb_max_agc))
ssb_demod_block = blocks.complex_to_real(1)
self.connect(
self,
self.band_filter_block,
sharp_filter_block,
# TODO: We would like to have a squelch which does not interfere with the AGC, but this is impossible without combining the squelch and AGC
self.rf_squelch_block,
self.agc_block,
ssb_demod_block)
self.connect(sharp_filter_block, self.rf_probe_block)
self.connect_audio_output(ssb_demod_block)