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fskdemod.py
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fskdemod.py
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from gnuradio import analog
from gnuradio import blocks
from gnuradio import eng_notation
from gnuradio import filter
from gnuradio import gr
from gnuradio.eng_option import eng_option
from gnuradio.filter import firdes
class FskDemod(gr.top_block):
def __init__(self, input_file, output_file):
gr.top_block.__init__(self)
##################################################
# Variables
##################################################
self.samp_rate = samp_rate = 2048000
##################################################
# Blocks
##################################################
self.low_pass_filter_1 = filter.fir_filter_fff(1, firdes.low_pass(
1, samp_rate, 85000, 2000, firdes.WIN_HAMMING, 6.76))
self.low_pass_filter_0 = filter.fir_filter_ccf(1, firdes.low_pass(
1, samp_rate, 200000, 1000, firdes.WIN_HAMMING, 6.76))
if input_file != None:
self.blocks_wavfile_source_0 = blocks.wavfile_source(input_file, False)
else:
import osmosdr
self.rtlsdr_source_0 = osmosdr.source( args="numchan=" + str(1) + " " + "" )
self.rtlsdr_source_0.set_sample_rate(samp_rate)
self.rtlsdr_source_0.set_center_freq(433463000, 0)
self.rtlsdr_source_0.set_freq_corr(0, 0)
self.rtlsdr_source_0.set_dc_offset_mode(0, 0)
self.rtlsdr_source_0.set_iq_balance_mode(0, 0)
self.rtlsdr_source_0.set_gain_mode(False, 0)
self.rtlsdr_source_0.set_gain(10, 0)
self.rtlsdr_source_0.set_if_gain(20, 0)
self.rtlsdr_source_0.set_bb_gain(20, 0)
self.rtlsdr_source_0.set_antenna("", 0)
self.rtlsdr_source_0.set_bandwidth(0, 0)
self.blocks_multiply_xx_0 = blocks.multiply_vcc(1)
self.blocks_float_to_complex_0 = blocks.float_to_complex(1)
if output_file == '-':
self.blocks_file_sink_0 = blocks.file_descriptor_sink(4, 1)
else:
self.blocks_file_sink_0 = blocks.file_sink(gr.sizeof_float*1, output_file, False)
self.blocks_file_sink_0.set_unbuffered(False)
self.blocks_add_const_vxx_0 = blocks.add_const_vff((0.00, ))
self.analog_sig_source_x_0 = analog.sig_source_c(samp_rate, analog.GR_COS_WAVE, -420000, 1, 0)
self.analog_quadrature_demod_cf_0 = analog.quadrature_demod_cf(1)
##################################################
# Connections
##################################################
self.connect((self.analog_quadrature_demod_cf_0, 0), (self.low_pass_filter_1, 0))
self.connect((self.analog_sig_source_x_0, 0), (self.blocks_multiply_xx_0, 1))
self.connect((self.blocks_add_const_vxx_0, 0), (self.blocks_file_sink_0, 0))
self.connect((self.blocks_multiply_xx_0, 0), (self.low_pass_filter_0, 0))
self.connect((self.low_pass_filter_0, 0), (self.analog_quadrature_demod_cf_0, 0))
self.connect((self.low_pass_filter_1, 0), (self.blocks_add_const_vxx_0, 0))
if input_file != None:
self.connect((self.blocks_wavfile_source_0, 1), (self.blocks_float_to_complex_0, 0))
self.connect((self.blocks_wavfile_source_0, 0), (self.blocks_float_to_complex_0, 1))
self.connect((self.blocks_float_to_complex_0, 0), (self.blocks_multiply_xx_0, 0))
else:
self.connect((self.rtlsdr_source_0, 0), (self.blocks_multiply_xx_0, 0))
def get_samp_rate(self):
return self.samp_rate
def set_samp_rate(self, samp_rate):
self.samp_rate = samp_rate
self.analog_sig_source_x_0.set_sampling_freq(self.samp_rate)
self.low_pass_filter_0.set_taps(firdes.low_pass(1, self.samp_rate, 10e3, 10e3, firdes.WIN_HAMMING, 6.76))
self.low_pass_filter_1.set_taps(firdes.low_pass(1, self.samp_rate, 40400, 20200, firdes.WIN_HAMMING, 6.76))