Open Source implementation of APCO P25
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#!/usr/bin/env python
import sys
import math
from gnuradio import gr, audio, eng_notation, filter, blocks
from gnuradio import analog, digital
from gnuradio.eng_option import eng_option
from optparse import OptionParser
class my_top_block(gr.top_block):
def __init__(self):
parser = OptionParser(option_class=eng_option)
parser.add_option("-c", "--calibration", type="eng_float", default=0, help="freq offset")
parser.add_option("-g", "--gain", type="eng_float", default=1)
parser.add_option("-i", "--input-file", type="string", default="in.dat", help="specify the input file")
parser.add_option("-o", "--output-file", type="string", default="out.dat", help="specify the output file")
parser.add_option("-r", "--new-sample-rate", type="int", default=96000, help="output sample rate")
parser.add_option("-s", "--sample-rate", type="int", default=48000, help="input sample rate")
(options, args) = parser.parse_args()
sample_rate = options.sample_rate
new_sample_rate = options.new_sample_rate
IN = blocks.file_source(gr.sizeof_gr_complex, options.input_file)
OUT = blocks.file_sink(gr.sizeof_gr_complex, options.output_file)
LO = analog.sig_source_c(sample_rate, analog.GR_COS_WAVE, options.calibration, 1.0, 0)
MIXER = blocks.multiply_cc()
AMP = blocks.multiply_const_cc(options.gain)
nphases = 32
frac_bw = 0.05
p1 = frac_bw
p2 = frac_bw
rs_taps = filter.firdes.low_pass(nphases, nphases, p1, p2)
RESAMP = filter.pfb_arb_resampler_ccf(float(new_sample_rate) / float(sample_rate), (rs_taps), nphases, )
self.connect(IN, (MIXER, 0))
self.connect(LO, (MIXER, 1))
self.connect(MIXER, AMP, RESAMP, OUT)
if __name__ == "__main__":
except KeyboardInterrupt: