1 files changed, 72 insertions, 0 deletions
diff --git a/gnuradio-examples/python/usrp/limbo/test_dft_analysis.py b/gnuradio-examples/python/usrp/limbo/test_dft_analysis.py
new file mode 100755
index 000000000..a1d9eda46
--- /dev/null
+++ b/gnuradio-examples/python/usrp/limbo/test_dft_analysis.py
@@ -0,0 +1,72 @@
+#!/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 ()