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Diffstat (limited to 'gnuradio-examples/python/usrp/limbo/tvrx_am_rcv_gui.py')
| -rwxr-xr-x | gnuradio-examples/python/usrp/limbo/tvrx_am_rcv_gui.py | 154 |
1 files changed, 154 insertions, 0 deletions
diff --git a/gnuradio-examples/python/usrp/limbo/tvrx_am_rcv_gui.py b/gnuradio-examples/python/usrp/limbo/tvrx_am_rcv_gui.py new file mode 100755 index 0000000000..403cf3fa4d --- /dev/null +++ b/gnuradio-examples/python/usrp/limbo/tvrx_am_rcv_gui.py @@ -0,0 +1,154 @@ +#!/usr/bin/env python +# +# Copyright 2004 Free Software Foundation, Inc. +# +# This file is part of GNU Radio +# +# GNU Radio is free software; you can redistribute it and/or modify +# it under the terms of the GNU General Public License as published by +# the Free Software Foundation; either version 3, or (at your option) +# any later version. +# +# GNU Radio is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +# GNU General Public License for more details. +# +# You should have received a copy of the GNU General Public License +# along with GNU Radio; see the file COPYING. If not, write to +# the Free Software Foundation, Inc., 51 Franklin Street, +# Boston, MA 02110-1301, USA. +# +# +# Demodulate an AM signal from the TVRX or a recorded file. +# The file format must be 256 ksps, complex data. +# + +from gnuradio import gr, gru, eng_notation +from gnuradio import audio_oss as audio +from gnuradio import usrp +from gnuradio import tv_rx +from gnuradio.eng_option import eng_option +from optparse import OptionParser +import sys +import math +from gnuradio.wxgui import stdgui, fftsink, scopesink +import wx + +# +# return a gr.flow_graph +# +class wfm_rx_graph (stdgui.gui_flow_graph): + def __init__(self,frame,panel,vbox,argv): + stdgui.gui_flow_graph.__init__ (self,frame,panel,vbox,argv) + + #set rf freq + rf_freq = 120.e6 + + # Decimation rate from USRP ADC to IF. + usrp_decim = 100 + + # Calculate the sampling rate of the USRP and capture file. + # Decimate the IF sampling rate down by 4 to 64 ksps + # This is a flow graph that has an input (capture file) and output (audio channel). + #self = gr.flow_graph () + + # Signal source is assumed to be 256 kspb / complex data stream. + which_side = 0 + # usrp is data source + if which_side == 0: + src = usrp.source_c (0, usrp_decim, 1, gru.hexint(0xf0f0f0f0), 0) + else: + src = usrp.source_c (0, usrp_decim, 1, gru.hexint(0xf0f0f0f2), 0) + + if_rate = 640e3 # src.adc_freq() / usrp_decim + if_decim = 5 + demod_rate = if_rate / if_decim + + audio_decimation = 4 + audio_rate = demod_rate / audio_decimation + + # set up frontend + dboard = tv_rx.tv_rx (src, which_side) + self.dboard = dboard + (success, actual_freq) = dboard.set_freq(rf_freq) + assert success + + if_freq = rf_freq - actual_freq + src.set_rx_freq (0, -if_freq) + + print "actual freq ", actual_freq + print "IF freq ", if_freq + + dboard.set_gain(50) + + #src = gr.file_source (gr.sizeof_gr_complex, "samples/atis_ffz_am_baseband_256k_complex.dat") + #src = gr.file_source (gr.sizeof_gr_complex, "samples/garagedoor1.dat", True) + + #channel_coeffs = gr.firdes.band_pass ( + # 1.0, # gain + # if_rate, + # 10, # center of low transition band + # 10000, # center of hi transition band + # 200, # width of transition band + # gr.firdes.WIN_HAMMING) + + channel_coeffs = gr.firdes.low_pass (1.0, if_rate, 10e3, 4e3, gr.firdes.WIN_HANN) + print "len(channel_coeffs) = ", len(channel_coeffs) + + # Tune to the desired frequency. + ddc = gr.freq_xlating_fir_filter_ccf (if_decim, channel_coeffs, -20e3, if_rate) + + # Demodule with classic sqrt (I*I + Q*Q) + magblock = gr.complex_to_mag() + + # Scale the audio + volumecontrol = gr.multiply_const_ff(.1) + + #band-pass + audio_coeffs = gr.firdes.band_pass ( + 1.0, # gain + demod_rate, + 10, # center of low transition band + 6000, # center of hi transition band + 200, # width of transition band + gr.firdes.WIN_HAMMING) + + + # Low pass filter the demodulator output + #audio_coeffs = gr.firdes.low_pass (1.0, demod_rate, 500, 200, gr.firdes.WIN_HANN) + print "len(audio_coeffs) = ", len(audio_coeffs) + + # input: float; output: float + audio_filter = gr.fir_filter_fff (audio_decimation, audio_coeffs) + + # sound card as final sink + audio_sink = audio.sink (int (audio_rate)) + + # now wire it all together + self.connect (src, ddc) + self.connect (ddc, magblock) + self.connect (magblock, volumecontrol) + self.connect (volumecontrol, audio_filter) + self.connect (audio_filter, (audio_sink, 0)) + + d_win = fftsink.fft_sink_c (self, panel, title="RF", fft_size=512, sample_rate=if_rate) + self.connect (src,d_win) + vbox.Add (d_win.win, 4, wx.EXPAND) + + p_win = fftsink.fft_sink_c (self, panel, title="IF", fft_size=512, sample_rate=demod_rate) + self.connect (ddc,p_win) + vbox.Add (p_win.win, 4, wx.EXPAND) + + r_win = fftsink.fft_sink_f (self, panel, title="Audio", fft_size=512, sample_rate=audio_rate) + self.connect (audio_filter,r_win) + vbox.Add (r_win.win, 4, wx.EXPAND) + + #audio_oscope = scopesink.scope_sink_f (self, panel, "Oscope Data", audio_rate) + #self.connect (audio_filter, audio_oscope) + #vbox.Add (audio_oscope.win, 4, wx.EXPAND) + +if __name__ == '__main__': + + app = stdgui.stdapp (wfm_rx_graph, "TVRX AM RX") + app.MainLoop () |