diff options
Diffstat (limited to 'docs/exploring-gnuradio/fm_demod_example.xml')
| -rw-r--r-- | docs/exploring-gnuradio/fm_demod_example.xml | 72 |
1 files changed, 37 insertions, 35 deletions
diff --git a/docs/exploring-gnuradio/fm_demod_example.xml b/docs/exploring-gnuradio/fm_demod_example.xml index b417da0a81..05c2ee163b 100644 --- a/docs/exploring-gnuradio/fm_demod_example.xml +++ b/docs/exploring-gnuradio/fm_demod_example.xml @@ -4,6 +4,8 @@ #!/usr/bin/env python from gnuradio import gr +from gnuradio import filter +from gnuradio import analog from gnuradio import audio from gnuradio import mc4020 import sys @@ -30,28 +32,28 @@ def build_graph (freq1, freq2): # compute FIR filter taps for channel selection channel_coeffs = \ - gr.firdes.low_pass (1.0, # gain - input_rate, # sampling rate - 250e3, # low pass cutoff freq - 8*100e3, # width of trans. band - gr.firdes.WIN_HAMMING) + filter.firdes.low_pass(1.0, # gain + input_rate, # sampling rate + 250e3, # low pass cutoff freq + 8*100e3, # width of trans. band + filter.firdes.WIN_HAMMING) # input: short; output: complex chan_filter1 = \ - gr.freq_xlating_fir_filter_scf (cfir_decimation, - channel_coeffs, - freq1, # 1st station freq - input_rate) + filter.freq_xlating_fir_filter_scf(cfir_decimation, + channel_coeffs, + freq1, # 1st station freq + input_rate) - (head1, tail1) = build_pipeline (fg, quad_rate, audio_decimation) + (head1, tail1) = build_pipeline(fg, quad_rate, audio_decimation) # sound card as final sink - audio_sink = audio.sink (int (audio_rate)) + audio_sink = audio.sink(int (audio_rate)) # now wire it all together - fg.connect (src, chan_filter1) - fg.connect (chan_filter1, head1) - fg.connect (tail1, (audio_sink, 0)) + fg.connect(src, chan_filter1) + fg.connect(chan_filter1, head1) + fg.connect(tail1, (audio_sink, 0)) return fg @@ -69,20 +71,20 @@ def build_pipeline (fg, quad_rate, audio_decimation): volume = 1.0 # input: complex; output: float - fm_demod = gr.quadrature_demod_cf (volume*fm_demod_gain) + fm_demod = analog.quadrature_demod_cf(volume*fm_demod_gain) # compute FIR filter taps for audio filter width_of_transition_band = audio_rate / 32 - audio_coeffs = gr.firdes.low_pass (1.0, # gain - quad_rate, # sampling rate - audio_rate/2 - width_of_transition_band, - width_of_transition_band, - gr.firdes.WIN_HAMMING) + audio_coeffs = filter.firdes.low_pass(1.0, # gain + quad_rate, # sampling rate + audio_rate/2 - width_of_transition_band, + width_of_transition_band, + filter.firdes.WIN_HAMMING) # input: float; output: float - audio_filter = gr.fir_filter_fff (audio_decimation, audio_coeffs) + audio_filter = filter.fir_filter_fff(audio_decimation, audio_coeffs) - fg.connect (fm_demod, audio_filter) + fg.connect(fm_demod, audio_filter) return ((fm_demod, 0), (audio_filter, 0)) @@ -90,34 +92,34 @@ def main (args): nargs = len (args) if nargs == 1: # get station frequency from command line - freq1 = float (args[0]) * 1e6 + freq1 = float(args[0]) * 1e6 else: - sys.stderr.write ('usage: fm_demod freq\n') - sys.exit (1) + sys.stderr.write('usage: fm_demod freq\n') + sys.exit(1) # connect to RF front end - rf_front_end = gr.microtune_4937_eval_board () - if not rf_front_end.board_present_p (): + rf_front_end = gr.microtune_4937_eval_board() + if not rf_front_end.board_present_p(): raise IOError, 'RF front end not found' # set front end gain - rf_front_end.set_AGC (300) + rf_front_end.set_AGC(300) # determine the front end's "Intermediate Frequency" - IF_freq = rf_front_end.get_output_freq () # 5.75e6 + IF_freq = rf_front_end.get_output_freq() # 5.75e6 # Tell the front end to tune to freq1. # I.e., freq1 is translated down to the IF frequency - rf_front_end.set_RF_freq (freq1) + rf_front_end.set_RF_freq(freq1) # build the flow graph - fg = build_graph (IF_freq, None) + fg = build_graph(IF_freq, None) - fg.start () # fork thread(s) and return - raw_input ('Press Enter to quit: ') - fg.stop () + fg.start() # fork thread(s) and return + raw_input('Press Enter to quit: ') + fg.stop() if __name__ == '__main__': - main (sys.argv[1:]) + main(sys.argv[1:]) </programlisting> </example> |