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#!/usr/bin/env python
from gnuradio import gr, gru, blks
from gnuradio.wxgui import stdgui, fftsink, slider
from gnuradio.eng_option import eng_option
from optparse import OptionParser
import wx
class test_graph (stdgui.gui_flow_graph):
def __init__(self, frame, panel, vbox, argv):
stdgui.gui_flow_graph.__init__(self, frame, panel, vbox, argv)
parser = OptionParser (option_class=eng_option)
(options, args) = parser.parse_args ()
sample_rate = 16e3
mpoints = 4
ampl = 1000
freq = 0
lo_freq = 1e6
lo_ampl = 1
vbox.Add(slider.slider(panel,
-sample_rate/2, sample_rate/2,
self.set_lo_freq), 0, wx.ALIGN_CENTER)
src = gr.sig_source_c(sample_rate, gr.GR_CONST_WAVE,
freq, ampl, 0)
self.lo = gr.sig_source_c(sample_rate, gr.GR_SIN_WAVE,
lo_freq, lo_ampl, 0)
mixer = gr.multiply_cc()
self.connect(src, (mixer, 0))
self.connect(self.lo, (mixer, 1))
# We add these throttle blocks so that this demo doesn't
# suck down all the CPU available. Normally you wouldn't use these.
thr = gr.throttle(gr.sizeof_gr_complex, sample_rate)
taps = gr.firdes.low_pass(1, # gain
1, # rate
1.0/mpoints * 0.4, # cutoff
1.0/mpoints * 0.1, # trans width
gr.firdes.WIN_HANN)
print len(taps)
analysis = blks.analysis_filterbank(self, mpoints, taps)
self.connect(mixer, thr)
self.connect(thr, analysis)
for i in range(mpoints):
fft = fftsink.fft_sink_c(self, frame, fft_size=128,
sample_rate=sample_rate/mpoints,
fft_rate=5,
title="Ch %d" % (i,))
self.connect((analysis, i), fft)
vbox.Add(fft.win, 1, wx.EXPAND)
def set_lo_freq(self, freq):
self.lo.set_frequency(freq)
def main ():
app = stdgui.stdapp (test_graph, "Test DFT filterbank")
app.MainLoop ()
if __name__ == '__main__':
main ()
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