2010-05-13 17:46:38 +00:00
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#!/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, fsk4, repeater
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from gnuradio.eng_option import eng_option
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from optparse import OptionParser
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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("-a", "--audio-input", type="string", default="")
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parser.add_option("-A", "--audio-output", type="string", default="")
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parser.add_option("-f", "--factor", type="eng_float", default=1)
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2010-11-25 12:43:32 +00:00
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parser.add_option("-i", "--do-interp", action="store_true", default=False, help="enable output interpolator")
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2010-05-13 17:46:38 +00:00
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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("-S", "--stretch", type="int", default=0, help="flex amt")
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parser.add_option("-y", "--symbol-rate", type="int", default=4800, help="input symbol 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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symbol_rate = options.symbol_rate
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IN = audio.source(sample_rate, options.audio_input)
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2010-11-25 12:43:32 +00:00
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audio_output_rate = 8000
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if options.do_interp:
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audio_output_rate = 48000
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OUT = audio.sink(audio_output_rate, options.audio_output)
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2010-05-13 17:46:38 +00:00
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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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0.2, # 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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AMP = gr.multiply_const_ff(options.factor)
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msgq = gr.msg_queue(2)
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FSK4 = fsk4.demod_ff(msgq, sample_rate, symbol_rate)
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2010-11-25 12:43:32 +00:00
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levels = levels = [-2.0, 0.0, 2.0, 4.0]
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SLICER = repeater.fsk4_slicer_fb(levels)
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framer_msgq = gr.msg_queue(2)
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DECODE = repeater.p25_frame_assembler('', # udp hostname
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0, # udp port no.
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options.verbose, #debug
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True, # do_imbe
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True, # do_output
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False, # do_msgq
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framer_msgq)
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2010-10-28 00:48:39 +00:00
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IMBE = repeater.vocoder(False, # 0=Decode,True=Encode
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2010-05-13 17:46:38 +00:00
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options.verbose, # Verbose flag
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options.stretch, # flex amount
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"", # udp ip address
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0, # udp port
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False) # dump raw u vectors
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CVT = gr.short_to_float()
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2010-11-25 12:43:32 +00:00
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if options.do_interp:
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interp_taps = gr.firdes.low_pass(1.0, 48000, 4000, 4000 * 0.1, gr.firdes.WIN_HANN)
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INTERP = gr.interp_fir_filter_fff(48000 // 8000, interp_taps)
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2010-05-13 17:46:38 +00:00
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AMP2 = gr.multiply_const_ff(1.0 / 32767.0)
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2010-11-25 12:43:32 +00:00
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self.connect(IN, AMP, SYMBOL_FILTER, FSK4, SLICER, DECODE, IMBE, CVT, AMP2)
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if options.do_interp:
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self.connect(AMP2, INTERP, OUT)
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else:
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self.connect(AMP2, OUT)
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2010-05-13 17:46:38 +00:00
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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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