On Tue, 2006-08-29 at 14:06 +0200, Carlo E. Prelz wrote:
> I decided to engage in a project whose target is to detect the
> existing cell-phone traffic in a specific surrounding and represent it
> in some visually or acoustically interesting way. This is a personal
Carlo got me interested in making an acoustical version of a wide
spectrum, results attached. It takes an fft of up to +/- 3.2Mhz at
rf then an ifft of that at af to get -16 to +16Khz, seems to work.
Decimation of 10, 20, 30, etc work, and it helps to keep the noise
floor below -20 db. Typical usage
usrp_fft_audio2.py -d 30 -g 80 -f 855e6 -R B
for a tvrx in the left side.
Offtopically, is PBS radio going with Ibiquity? Just noticed
my local station (88.5) sporting these digital looking sidebands :
http://webpages.charter.net/cswiger/public_radio_hd.jpg
--Chuck
#!/usr/bin/env python
#
# Copyright 2004,2005 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 2, 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., 59 Temple Place - Suite 330,
# Boston, MA 02111-1307, USA.
#
from gnuradio import gr, gru, audio, window
from gnuradio import usrp
from gnuradio import eng_notation
from gnuradio.eng_option import eng_option
from gnuradio.wxgui import stdgui, fftsink, waterfallsink, scopesink, form, slider
from optparse import OptionParser
import wx
import sys
def pick_subdevice(u):
"""
The user didn't specify a subdevice on the command line.
If there's a daughterboard on A, select A.
If there's a daughterboard on B, select B.
Otherwise, select A.
"""
if u.db[0][0].dbid() >= 0: # dbid is < 0 if there's no d'board or a problem
return (0, 0)
if u.db[1][0].dbid() >= 0:
return (1, 0)
return (0, 0)
class app_flow_graph(stdgui.gui_flow_graph):
def __init__(self, frame, panel, vbox, argv):
stdgui.gui_flow_graph.__init__(self)
self.frame = frame
self.panel = panel
parser = OptionParser(option_class=eng_option)
parser.add_option("-R", "--rx-subdev-spec", type="subdev", default=None,
help="select USRP Rx side A or B (default=first one with a daughterboard)")
parser.add_option("-d", "--decim", type="int", default=16,
help="set fgpa decimation rate to DECIM [default=%default]")
parser.add_option("-f", "--freq", type="eng_float", default=None,
help="set frequency to FREQ", metavar="FREQ")
parser.add_option("-g", "--gain", type="eng_float", default=None,
help="set gain in dB (default is midpoint)")
parser.add_option("-W", "--waterfall", action="store_true", default=False,
help="Enable waterfall display")
parser.add_option("-8", "--width-8", action="store_true", default=False,
help="Enable 8-bit samples across USB")
parser.add_option("-S", "--oscilloscope", action="store_true", default=False,
help="Enable oscilloscope display")
(options, args) = parser.parse_args()
if len(args) != 0:
parser.print_help()
sys.exit(1)
self.show_debug_info = True
# build the graph
self.u = usrp.source_c(decim_rate=options.decim)
if options.rx_subdev_spec is None:
options.rx_subdev_spec = pick_subdevice(self.u)
self.u.set_mux(usrp.determine_rx_mux_value(self.u, options.rx_subdev_spec))
if options.width_8:
width = 8
shift = 8
format = self.u.make_format(width, shift)
print "format =", hex(format)
r = self.u.set_format(format)
print "set_format =", r
# determine the daughterboard subdevice we're using
self.subdev = usrp.selected_subdev(self.u, options.rx_subdev_spec)
input_rate = self.u.adc_freq() / self.u.decim_rate()
if options.waterfall:
self.scope = \
waterfallsink.waterfall_sink_c (self, panel, fft_size=1024, sample_rate=input_rate)
elif options.oscilloscope:
self.scope = scopesink.scope_sink_c(self, panel, sample_rate=input_rate)
else:
self.scope = fftsink.fft_sink_c (self, panel, fft_size=1024, sample_rate=input_rate)
self.connect(self.u, self.scope)
# Output the spectrum in audio range
# 2000 = 64e6 / 32000 , ADC_rate / audio_rate
d2 = 2000 / options.decim
# larger fftsize increases noise
fft1size = 64
s2p = gr.serial_to_parallel(gr.sizeof_gr_complex, fft1size)
# mywindow = window.hamming(fft1size)
mywindow = fft1size * [1]
fft1 = gr.fft_vcc(fft1size,True,mywindow)
decim2 = gr.keep_one_in_n(fft1size*gr.sizeof_gr_complex,d2)
ifft1 = gr.fft_vcc(fft1size,False,mywindow)
p2s = gr.parallel_to_serial(gr.sizeof_gr_complex, fft1size)
scale = gr.multiply_const_cc(complex(.0005,0))
c2f = gr.complex_to_float()
audio_out = audio.sink(32000)
self.connect(self.u,s2p,fft1,decim2,ifft1,p2s,scale,c2f)
self.connect((c2f,0),(audio_out,0))
self.connect((c2f,1),(audio_out,1))
self._build_gui(vbox)
# set initial values
if options.gain is None:
# if no gain was specified, use the mid-point in dB
g = self.subdev.gain_range()
options.gain = float(g[0]+g[1])/2
if options.freq is None:
# if no freq was specified, use the mid-point
r = self.subdev.freq_range()
options.freq = float(r[0]+r[1])/2
self.set_gain(options.gain)
if self.show_debug_info:
self.myform['decim'].set_value(self.u.decim_rate())
self.myform['[EMAIL PROTECTED]'].set_value(self.u.adc_freq() / self.u.decim_rate())
self.myform['dbname'].set_value(self.subdev.name())
self.myform['baseband'].set_value(0)
self.myform['ddc'].set_value(0)
if not(self.set_freq(options.freq)):
self._set_status_msg("Failed to set initial frequency")
def _set_status_msg(self, msg):
self.frame.GetStatusBar().SetStatusText(msg, 0)
def _build_gui(self, vbox):
def _form_set_freq(kv):
return self.set_freq(kv['freq'])
vbox.Add(self.scope.win, 10, wx.EXPAND)
# add control area at the bottom
self.myform = myform = form.form()
hbox = wx.BoxSizer(wx.HORIZONTAL)
hbox.Add((5,0), 0, 0)
myform['freq'] = form.float_field(
parent=self.panel, sizer=hbox, label="Center freq", weight=1,
callback=myform.check_input_and_call(_form_set_freq, self._set_status_msg))
hbox.Add((5,0), 0, 0)
g = self.subdev.gain_range()
myform['gain'] = form.slider_field(parent=self.panel, sizer=hbox, label="Gain",
weight=3,
min=int(g[0]), max=int(g[1]),
callback=self.set_gain)
hbox.Add((5,0), 0, 0)
vbox.Add(hbox, 0, wx.EXPAND)
self._build_subpanel(vbox)
def _build_subpanel(self, vbox_arg):
# build a secondary information panel (sometimes hidden)
# FIXME figure out how to have this be a subpanel that is always
# created, but has its visibility controlled by foo.Show(True/False)
def _form_set_decim(kv):
return self.set_decim(kv['decim'])
if not(self.show_debug_info):
return
panel = self.panel
vbox = vbox_arg
myform = self.myform
#panel = wx.Panel(self.panel, -1)
#vbox = wx.BoxSizer(wx.VERTICAL)
hbox = wx.BoxSizer(wx.HORIZONTAL)
hbox.Add((5,0), 0)
myform['decim'] = form.int_field(
parent=panel, sizer=hbox, label="Decim",
callback=myform.check_input_and_call(_form_set_decim, self._set_status_msg))
hbox.Add((5,0), 1)
myform['[EMAIL PROTECTED]'] = form.static_float_field(
parent=panel, sizer=hbox, label="[EMAIL PROTECTED]")
hbox.Add((5,0), 1)
myform['dbname'] = form.static_text_field(
parent=panel, sizer=hbox)
hbox.Add((5,0), 1)
myform['baseband'] = form.static_float_field(
parent=panel, sizer=hbox, label="Analog BB")
hbox.Add((5,0), 1)
myform['ddc'] = form.static_float_field(
parent=panel, sizer=hbox, label="DDC")
hbox.Add((5,0), 0)
vbox.Add(hbox, 0, wx.EXPAND)
def set_freq(self, target_freq):
"""
Set the center frequency we're interested in.
@param target_freq: frequency in Hz
@rypte: bool
Tuning is a two step process. First we ask the front-end to
tune as close to the desired frequency as it can. Then we use
the result of that operation and our target_frequency to
determine the value for the digital down converter.
"""
r = self.u.tune(0, self.subdev, target_freq)
if r:
self.myform['freq'].set_value(target_freq) # update displayed value
if self.show_debug_info:
self.myform['baseband'].set_value(r.baseband_freq)
self.myform['ddc'].set_value(r.dxc_freq)
return True
return False
def set_gain(self, gain):
self.myform['gain'].set_value(gain) # update displayed value
self.subdev.set_gain(gain)
def set_decim(self, decim):
ok = self.u.set_decim_rate(decim)
if not ok:
print "set_decim failed"
input_rate = self.u.adc_freq() / self.u.decim_rate()
self.scope.set_sample_rate(input_rate)
if self.show_debug_info: # update displayed values
self.myform['decim'].set_value(self.u.decim_rate())
self.myform['[EMAIL PROTECTED]'].set_value(self.u.adc_freq() / self.u.decim_rate())
return ok
def main ():
app = stdgui.stdapp(app_flow_graph, "USRP FFT", nstatus=1)
app.MainLoop()
if __name__ == '__main__':
main ()
_______________________________________________
Discuss-gnuradio mailing list
[email protected]
http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
