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#!/usr/bin/env python
from gnuradio import gr, gru, blks
from gnuradio.wxgui import stdgui, fftsink
from gnuradio.eng_option import eng_option
from optparse import OptionParser
import wx
import random
def make_random_complex_tuple(L, gain=1):
result = []
for x in range(L):
result.append(gain * complex(random.gauss(0, 1),random.gauss(0, 1)))
return tuple(result)
def random_noise_c(gain=1):
src = gr.vector_source_c(make_random_complex_tuple(32*1024, gain), True)
return src
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 = 16e6
mpoints = 16
ampl = 1000
enable = mpoints * [0]
enable[0] = 1
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)
synth = blks.synthesis_filterbank(self, mpoints, taps)
null_source = gr.null_source(gr.sizeof_gr_complex)
if 0:
for i in range(mpoints):
s = gr.sig_source_c(sample_rate/mpoints, gr.GR_SIN_WAVE,
300e3, ampl * enable[i], 0)
self.connect(s, (synth, i))
else:
for i in range(mpoints):
if i == 0:
s = gr.sig_source_c(sample_rate/mpoints, gr.GR_SIN_WAVE,
300e3, ampl * enable[i], 0)
#s = random_noise_c(ampl)
self.connect(s, (synth, i))
else:
self.connect(null_source, (synth, i))
# 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)
fft = fftsink.fft_sink_c(self, frame, fft_size=1024,
sample_rate=sample_rate)
vbox.Add(fft.win, 1, wx.EXPAND)
self.connect(synth, thr, fft)
def main ():
app = stdgui.stdapp (test_graph, "Test DFT filterbank")
app.MainLoop ()
if __name__ == '__main__':
main ()
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