67 lines
2.6 KiB
Python
Executable File
67 lines
2.6 KiB
Python
Executable File
#!/usr/bin/env python
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import sys
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import math
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from gnuradio import gr, gru, audio, eng_notation, blks2, optfir, repeater
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from gnuradio.eng_option import eng_option
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from optparse import OptionParser
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# import cqpsk
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from math import pi
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class my_top_block(gr.top_block):
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def __init__(self):
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gr.top_block.__init__(self)
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parser = OptionParser(option_class=eng_option)
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parser.add_option("-i", "--input-file", type="string", default="in.dat", help="specify the input file")
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parser.add_option("-g", "--gain", type="eng_float", default=1.0)
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parser.add_option("-L", "--low-pass", type="eng_float", default=15e3, help="low pass cut-off", metavar="Hz")
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parser.add_option("-o", "--output-file", type="string", default="out.dat", help="specify the output file")
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parser.add_option("-s", "--sample-rate", type="int", default=48000, help="input sample rate")
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parser.add_option("-v", "--verbose", action="store_true", default=False, help="dump demodulation data")
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(options, args) = parser.parse_args()
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sample_rate = options.sample_rate
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sps = 10
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symbol_rate = 4800
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# output rate will be 48,000
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ntaps = 11 * sps
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channel_taps = gr.firdes.low_pass(1.0, sample_rate, options.low_pass, options.low_pass * 0.1, gr.firdes.WIN_HANN)
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IN = gr.file_source(gr.sizeof_short, options.input_file)
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OUT = gr.file_sink(gr.sizeof_char, options.output_file)
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CVT = gr.short_to_float()
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AMP = gr.multiply_const_ff(options.gain / 32767.0)
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symbol_decim = 1
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symbol_coeffs = gr.firdes.root_raised_cosine (1.0, # gain
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sample_rate , # sampling rate
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symbol_rate, # symbol rate
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0.20, # width of trans. band
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500) # filter type
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SYMBOL_FILTER = gr.fir_filter_fff (symbol_decim, symbol_coeffs)
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self.msgq = gr.msg_queue(2)
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FSK4 = op25.fsk4_demod_ff(self.msgq, sample_rate, symbol_rate)
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levels = [ -2.0, 0.0, 2.0, 4.0 ]
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SLICER = repeater.fsk4_slicer_fb(levels)
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hostname = "127.0.0.1"
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port = 23456
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debug = 255
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do_imbe = False
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do_output = True
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do_msgq = False
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msgqd = gr.msg_queue(2)
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DECODER = repeater.p25_frame_assembler(hostname, port, debug, do_imbe, do_output, do_msgq, msgqd)
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self.connect(IN, CVT, AMP, SYMBOL_FILTER, FSK4, SLICER, DECODER, OUT)
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if __name__ == "__main__":
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try:
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my_top_block().run()
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except KeyboardInterrupt:
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tb.stop()
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