From f1c41f807cb29472d0924149e39d6ec8ad90e6a2 Mon Sep 17 00:00:00 2001
From: eb <eb@221aa14e-8319-0410-a670-987f0aec2ac5>
Date: Wed, 27 Sep 2006 05:14:03 +0000
Subject: Merged changes from eb/digital-wip into trunk.
This includes:
* renaming gnuradio-examples/python/gmsk2 to gnuradio-examples/python/digital
* refactoring the digital data tx and rx test code into benchmark_tx
and benchmark_rx. These accept a -m <modulation> argument.
<modulation> can currently be selected from gmsk, dbpsk, dqpsk
* Two new AGC blocks: gr_agc2: separate attack and delay rates;
gr_feedforward_agc: FIR-ish compressor. Normalizes to peak envelope.
* Working DBPSK mod/demod (works fine)
* Working DQPSK mod/demod (works, but still needs more work)
git-svn-id: http://gnuradio.org/svn/gnuradio/trunk@3662 221aa14e-8319-0410-a670-987f0aec2ac5
---
gnuradio-examples/python/mc4020/fm_demod.py | 150 ----------------------------
1 file changed, 150 deletions(-)
delete mode 100755 gnuradio-examples/python/mc4020/fm_demod.py
(limited to 'gnuradio-examples/python/mc4020/fm_demod.py')
diff --git a/gnuradio-examples/python/mc4020/fm_demod.py b/gnuradio-examples/python/mc4020/fm_demod.py
deleted file mode 100755
index e58407f738..0000000000
--- a/gnuradio-examples/python/mc4020/fm_demod.py
+++ /dev/null
@@ -1,150 +0,0 @@
-#!/usr/bin/env python
-
-from gnuradio import gr
-from gnuradio import audio
-from gnuradio import mc4020
-import sys
-
-def high_speed_adc (fg, input_rate):
- # return gr.file_source (gr.sizeof_short, "dummy.dat", False)
- return mc4020.source (input_rate, mc4020.MCC_CH3_EN | mc4020.MCC_ALL_1V)
-
-#
-# return a gr.flow_graph
-#
-def build_graph (freq1, freq2):
- input_rate = 20e6
- cfir_decimation = 125
- audio_decimation = 5
-
- quad_rate = input_rate / cfir_decimation
- audio_rate = quad_rate / audio_decimation
-
- fg = gr.flow_graph ()
-
- # use high speed ADC as input source
- src = high_speed_adc (fg, input_rate)
-
- # 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)
-
- # input: short; output: complex
- chan_filter1 = \
- gr.freq_xlating_fir_filter_scf (cfir_decimation,
- channel_coeffs,
- freq1, # 1st station freq
- input_rate)
-
- (head1, tail1) = build_pipeline (fg, quad_rate, audio_decimation)
-
- # sound card as final sink
- 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))
-
- # two stations at once?
- if freq2:
- # Extract the second station and connect
- # it to a second pipeline...
-
- # input: short; output: complex
- chan_filter2 = \
- gr.freq_xlating_fir_filter_scf (cfir_decimation,
- channel_coeffs,
- freq2, # 2nd station freq
- input_rate)
-
- (head2, tail2) = build_pipeline (fg, quad_rate, audio_decimation)
-
- fg.connect (src, chan_filter2)
- fg.connect (chan_filter2, head2)
- fg.connect (tail2, (audio_sink, 1))
-
- return fg
-
-def build_pipeline (fg, quad_rate, audio_decimation):
- '''Given a flow_graph, fg, construct a pipeline
- for demodulating a broadcast FM signal. The
- input is the downconverteed complex baseband
- signal. The output is the demodulated audio.
-
- build_pipeline returns a two element tuple
- containing the input and output endpoints.
- '''
- fm_demod_gain = 2200.0/32768.0
- audio_rate = quad_rate / audio_decimation
- volume = 1.0
-
- # input: complex; output: float
- fm_demod = gr.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)
-
- # input: float; output: float
- audio_filter = gr.fir_filter_fff (audio_decimation, audio_coeffs)
-
- fg.connect (fm_demod, audio_filter)
- return ((fm_demod, 0), (audio_filter, 0))
-
-
-def main (args):
- nargs = len (args)
- if nargs == 1:
- freq1 = float (args[0]) * 1e6
- freq2 = None
- elif nargs == 2:
- freq1 = float (args[0]) * 1e6
- freq2 = float (args[1]) * 1e6
- else:
- sys.stderr.write ('usage: fm_demod freq1 [freq2]\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 ():
- raise IOError, 'RF front end not found'
-
- # set front end gain
- rf_front_end.set_AGC (300)
- IF_freq = rf_front_end.get_output_freq ()
- IF_freq = 5.75e6
-
- if not freq2: # one station
-
- rf_front_end.set_RF_freq (freq1)
- fg = build_graph (IF_freq, None)
-
- else: # two stations
-
- if abs (freq1 - freq2) > 5.5e6:
- raise IOError, 'freqs too far apart'
-
- target_freq = (freq1 + freq2) / 2
- actual_freq = rf_front_end.set_RF_freq (target_freq)
- #actual_freq = target_freq
-
- fg = build_graph (IF_freq + freq1 - actual_freq,
- IF_freq + freq2 - actual_freq)
-
- fg.start () # fork thread(s) and return
- raw_input ('Press Enter to quit: ')
- fg.stop ()
-
-if __name__ == '__main__':
- main (sys.argv[1:])
-
-
--
cgit v1.2.3