From 0e86a5f357d40de759c804cc704dd907c50b02d7 Mon Sep 17 00:00:00 2001
From: Tom Rondeau
Date: Fri, 9 Sep 2011 16:34:49 -0400
Subject: tags: updated uhd_burst_detector with a better energy detector. Works
 well when receiving bursty NBFM signals.

---
 .../python/tags/uhd_burst_detector.py              | 66 ++++++++++++++--------
 1 file changed, 43 insertions(+), 23 deletions(-)

(limited to 'gnuradio-examples/python')

diff --git a/gnuradio-examples/python/tags/uhd_burst_detector.py b/gnuradio-examples/python/tags/uhd_burst_detector.py
index f8ebbe66a..ffa419562 100755
--- a/gnuradio-examples/python/tags/uhd_burst_detector.py
+++ b/gnuradio-examples/python/tags/uhd_burst_detector.py
@@ -1,4 +1,24 @@
 #!/usr/bin/env python
+#
+# Copyright 2011 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.
+# 
 
 from gnuradio import eng_notation
 from gnuradio import gr
@@ -9,16 +29,16 @@ from gnuradio.gr import firdes
 from optparse import OptionParser
 
 class uhd_burst_detector(gr.top_block):
-    def __init__(self, frequency, sample_rate,
-                 uhd_address="192.168.10.2", trigger=False):
+    def __init__(self, uhd_address, options):
 
         gr.top_block.__init__(self)
 
-        self.freq = frequency
-        self.samp_rate = sample_rate
         self.uhd_addr = uhd_address
-        self.gain = 32
-        self.trigger = trigger
+        self.freq = options.freq
+        self.samp_rate = options.samp_rate
+        self.gain = options.gain
+        self.threshold = options.threshold
+        self.trigger = options.trigger
         
         self.uhd_src = uhd.single_usrp_source(
             device_addr=self.uhd_addr,
@@ -32,7 +52,6 @@ class uhd_burst_detector(gr.top_block):
 
         taps = firdes.low_pass_2(1, 1, 0.4, 0.1, 60)
         self.chanfilt = gr.fir_filter_ccc(10, taps)
-        self.ann0 = gr.annotator_alltoall(100000, gr.sizeof_gr_complex)
         self.tagger = gr.burst_tagger(gr.sizeof_gr_complex)
 
         # Dummy signaler to collect a burst on known periods
@@ -40,11 +59,18 @@ class uhd_burst_detector(gr.top_block):
         self.signal = gr.vector_source_s(data, True)
 
         # Energy detector to get signal burst
+        ## use squelch to detect energy
+        self.det  = gr.simple_squelch_cc(self.threshold, 0.01)
+        ## convert to mag squared (float)
         self.c2m = gr.complex_to_mag_squared()
-        self.iir = gr.single_pole_iir_filter_ff(0.0001)
-        self.sub = gr.sub_ff()
-        self.mult = gr.multiply_const_ff(32768)
+        ## average to debounce
+        self.avg = gr.single_pole_iir_filter_ff(0.01)
+        ## rescale signal for conversion to short
+        self.scale = gr.multiply_const_ff(2**16)
+        ## signal input uses shorts
         self.f2s = gr.float_to_short()
+
+        # Use file sink burst tagger to capture bursts
         self.fsnk = gr.tagged_file_sink(gr.sizeof_gr_complex, self.samp_rate)
         
 
@@ -60,17 +86,12 @@ class uhd_burst_detector(gr.top_block):
 
         else:
             # Connect an energy detector signaler to the burst tagger
-            self.connect((self.uhd_src, 0), (self.c2m, 0))
-            self.connect((self.c2m, 0), (self.sub, 0))
-            self.connect((self.c2m, 0), (self.iir, 0))
-            self.connect((self.iir, 0), (self.sub, 1))
-            self.connect((self.sub, 0), (self.mult,0))
-            self.connect((self.mult, 0), (self.f2s, 0))
-            self.connect((self.f2s, 0), (self.tagger, 1))
+            self.connect(self.uhd_src, self.det)
+            self.connect(self.det, self.c2m, self.avg, self.scale, self.f2s)
+            self.connect(self.f2s, (self.tagger, 1))
         
     def set_samp_rate(self, samp_rate):
         self.samp_rate = samp_rate
-        self.wxgui_fftsink2_0.set_sample_rate(self.samp_rate/10)
         self.uhd_src_0.set_samp_rate(self.samp_rate)
             
 if __name__ == '__main__':
@@ -83,16 +104,15 @@ if __name__ == '__main__':
                       help="set frequency to FREQ", metavar="FREQ")
     parser.add_option("-g", "--gain", type="eng_float", default=0,
                       help="set gain in dB [default=%default]")
-    parser.add_option("-R", "--rate", type="eng_float", default=200000,
+    parser.add_option("-R", "--samp-rate", type="eng_float", default=200000,
                       help="set USRP sample rate [default=%default]")
+    parser.add_option("-t", "--threshold", type="float", default=-60,
+                      help="Set the detection power threshold (dBm) [default=%default")
     parser.add_option("-T", "--trigger", action="store_true", default=False,
                       help="Use internal trigger instead of detector [default=%default]")
     (options, args) = parser.parse_args()
     
-    frequency = options.freq
-    samp_rate = samp_rate = options.rate
     uhd_addr = options.address
-    trigger = options.trigger
 
-    tb = uhd_burst_detector(frequency, samp_rate, uhd_addr, trigger)
+    tb = uhd_burst_detector(uhd_addr, options)
     tb.run()
-- 
cgit 


From 34d725a16b695be59f04f2b4eb503532d1cbfe2f Mon Sep 17 00:00:00 2001
From: Tom Rondeau
Date: Fri, 9 Sep 2011 17:08:23 -0400
Subject: tags: adding tags examples to build distribution.

---
 gnuradio-examples/python/Makefile.am      |  1 +
 gnuradio-examples/python/tags/.gitignore  |  2 ++
 gnuradio-examples/python/tags/Makefile.am | 29 +++++++++++++++++++++++++++++
 3 files changed, 32 insertions(+)
 create mode 100644 gnuradio-examples/python/tags/.gitignore
 create mode 100644 gnuradio-examples/python/tags/Makefile.am

(limited to 'gnuradio-examples/python')

diff --git a/gnuradio-examples/python/Makefile.am b/gnuradio-examples/python/Makefile.am
index eba4c14ab..3f1977e74 100644
--- a/gnuradio-examples/python/Makefile.am
+++ b/gnuradio-examples/python/Makefile.am
@@ -31,5 +31,6 @@ SUBDIRS = \
 	network \
 	ofdm \
 	pfb \
+	tags \
 	usrp \
 	usrp2
diff --git a/gnuradio-examples/python/tags/.gitignore b/gnuradio-examples/python/tags/.gitignore
new file mode 100644
index 000000000..b336cc7ce
--- /dev/null
+++ b/gnuradio-examples/python/tags/.gitignore
@@ -0,0 +1,2 @@
+/Makefile
+/Makefile.in
diff --git a/gnuradio-examples/python/tags/Makefile.am b/gnuradio-examples/python/tags/Makefile.am
new file mode 100644
index 000000000..5d71bf9b0
--- /dev/null
+++ b/gnuradio-examples/python/tags/Makefile.am
@@ -0,0 +1,29 @@
+#
+# Copyright 2011 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.
+# 
+
+include $(top_srcdir)/Makefile.common
+
+ourdatadir = $(exampledir)/tags
+
+dist_ourdata_SCRIPTS =		\
+	test_file_tags.py	\
+	uhd_burst_detector.py
+
-- 
cgit 


From 7fa533e2b04423e31159b10fb4c54554fe93ea0e Mon Sep 17 00:00:00 2001
From: Tom Rondeau
Date: Fri, 9 Sep 2011 16:34:49 -0400
Subject: tags: updated uhd_burst_detector with a better energy detector. Works
 well when receiving bursty NBFM signals.

---
 .../python/tags/uhd_burst_detector.py              | 66 ++++++++++++++--------
 1 file changed, 43 insertions(+), 23 deletions(-)

(limited to 'gnuradio-examples/python')

diff --git a/gnuradio-examples/python/tags/uhd_burst_detector.py b/gnuradio-examples/python/tags/uhd_burst_detector.py
index f8ebbe66a..ffa419562 100755
--- a/gnuradio-examples/python/tags/uhd_burst_detector.py
+++ b/gnuradio-examples/python/tags/uhd_burst_detector.py
@@ -1,4 +1,24 @@
 #!/usr/bin/env python
+#
+# Copyright 2011 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.
+# 
 
 from gnuradio import eng_notation
 from gnuradio import gr
@@ -9,16 +29,16 @@ from gnuradio.gr import firdes
 from optparse import OptionParser
 
 class uhd_burst_detector(gr.top_block):
-    def __init__(self, frequency, sample_rate,
-                 uhd_address="192.168.10.2", trigger=False):
+    def __init__(self, uhd_address, options):
 
         gr.top_block.__init__(self)
 
-        self.freq = frequency
-        self.samp_rate = sample_rate
         self.uhd_addr = uhd_address
-        self.gain = 32
-        self.trigger = trigger
+        self.freq = options.freq
+        self.samp_rate = options.samp_rate
+        self.gain = options.gain
+        self.threshold = options.threshold
+        self.trigger = options.trigger
         
         self.uhd_src = uhd.single_usrp_source(
             device_addr=self.uhd_addr,
@@ -32,7 +52,6 @@ class uhd_burst_detector(gr.top_block):
 
         taps = firdes.low_pass_2(1, 1, 0.4, 0.1, 60)
         self.chanfilt = gr.fir_filter_ccc(10, taps)
-        self.ann0 = gr.annotator_alltoall(100000, gr.sizeof_gr_complex)
         self.tagger = gr.burst_tagger(gr.sizeof_gr_complex)
 
         # Dummy signaler to collect a burst on known periods
@@ -40,11 +59,18 @@ class uhd_burst_detector(gr.top_block):
         self.signal = gr.vector_source_s(data, True)
 
         # Energy detector to get signal burst
+        ## use squelch to detect energy
+        self.det  = gr.simple_squelch_cc(self.threshold, 0.01)
+        ## convert to mag squared (float)
         self.c2m = gr.complex_to_mag_squared()
-        self.iir = gr.single_pole_iir_filter_ff(0.0001)
-        self.sub = gr.sub_ff()
-        self.mult = gr.multiply_const_ff(32768)
+        ## average to debounce
+        self.avg = gr.single_pole_iir_filter_ff(0.01)
+        ## rescale signal for conversion to short
+        self.scale = gr.multiply_const_ff(2**16)
+        ## signal input uses shorts
         self.f2s = gr.float_to_short()
+
+        # Use file sink burst tagger to capture bursts
         self.fsnk = gr.tagged_file_sink(gr.sizeof_gr_complex, self.samp_rate)
         
 
@@ -60,17 +86,12 @@ class uhd_burst_detector(gr.top_block):
 
         else:
             # Connect an energy detector signaler to the burst tagger
-            self.connect((self.uhd_src, 0), (self.c2m, 0))
-            self.connect((self.c2m, 0), (self.sub, 0))
-            self.connect((self.c2m, 0), (self.iir, 0))
-            self.connect((self.iir, 0), (self.sub, 1))
-            self.connect((self.sub, 0), (self.mult,0))
-            self.connect((self.mult, 0), (self.f2s, 0))
-            self.connect((self.f2s, 0), (self.tagger, 1))
+            self.connect(self.uhd_src, self.det)
+            self.connect(self.det, self.c2m, self.avg, self.scale, self.f2s)
+            self.connect(self.f2s, (self.tagger, 1))
         
     def set_samp_rate(self, samp_rate):
         self.samp_rate = samp_rate
-        self.wxgui_fftsink2_0.set_sample_rate(self.samp_rate/10)
         self.uhd_src_0.set_samp_rate(self.samp_rate)
             
 if __name__ == '__main__':
@@ -83,16 +104,15 @@ if __name__ == '__main__':
                       help="set frequency to FREQ", metavar="FREQ")
     parser.add_option("-g", "--gain", type="eng_float", default=0,
                       help="set gain in dB [default=%default]")
-    parser.add_option("-R", "--rate", type="eng_float", default=200000,
+    parser.add_option("-R", "--samp-rate", type="eng_float", default=200000,
                       help="set USRP sample rate [default=%default]")
+    parser.add_option("-t", "--threshold", type="float", default=-60,
+                      help="Set the detection power threshold (dBm) [default=%default")
     parser.add_option("-T", "--trigger", action="store_true", default=False,
                       help="Use internal trigger instead of detector [default=%default]")
     (options, args) = parser.parse_args()
     
-    frequency = options.freq
-    samp_rate = samp_rate = options.rate
     uhd_addr = options.address
-    trigger = options.trigger
 
-    tb = uhd_burst_detector(frequency, samp_rate, uhd_addr, trigger)
+    tb = uhd_burst_detector(uhd_addr, options)
     tb.run()
-- 
cgit 


From 0c9ec724a6f5e1dc234bb8b3158726310a3bb0cb Mon Sep 17 00:00:00 2001
From: Tom Rondeau
Date: Fri, 9 Sep 2011 17:08:23 -0400
Subject: tags: adding tags examples to build distribution.

---
 gnuradio-examples/python/Makefile.am      |  1 +
 gnuradio-examples/python/tags/.gitignore  |  2 ++
 gnuradio-examples/python/tags/Makefile.am | 29 +++++++++++++++++++++++++++++
 3 files changed, 32 insertions(+)
 create mode 100644 gnuradio-examples/python/tags/.gitignore
 create mode 100644 gnuradio-examples/python/tags/Makefile.am

(limited to 'gnuradio-examples/python')

diff --git a/gnuradio-examples/python/Makefile.am b/gnuradio-examples/python/Makefile.am
index 30effdf9a..65021729a 100644
--- a/gnuradio-examples/python/Makefile.am
+++ b/gnuradio-examples/python/Makefile.am
@@ -32,5 +32,6 @@ SUBDIRS = \
 	network \
 	ofdm \
 	pfb \
+	tags \
 	usrp \
 	usrp2
diff --git a/gnuradio-examples/python/tags/.gitignore b/gnuradio-examples/python/tags/.gitignore
new file mode 100644
index 000000000..b336cc7ce
--- /dev/null
+++ b/gnuradio-examples/python/tags/.gitignore
@@ -0,0 +1,2 @@
+/Makefile
+/Makefile.in
diff --git a/gnuradio-examples/python/tags/Makefile.am b/gnuradio-examples/python/tags/Makefile.am
new file mode 100644
index 000000000..5d71bf9b0
--- /dev/null
+++ b/gnuradio-examples/python/tags/Makefile.am
@@ -0,0 +1,29 @@
+#
+# Copyright 2011 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.
+# 
+
+include $(top_srcdir)/Makefile.common
+
+ourdatadir = $(exampledir)/tags
+
+dist_ourdata_SCRIPTS =		\
+	test_file_tags.py	\
+	uhd_burst_detector.py
+
-- 
cgit 


From 801465fe8dbac9905ac74aeb5c3dc308d3328d98 Mon Sep 17 00:00:00 2001
From: Tom Rondeau
Date: Fri, 23 Sep 2011 17:03:32 -0400
Subject: examples: fixed examples (pfb and tags) to print an error when python
 modules are not available.

---
 gnuradio-examples/python/pfb/channelize.py       | 19 ++++++++---
 gnuradio-examples/python/pfb/chirp_channelize.py | 19 ++++++++---
 gnuradio-examples/python/pfb/decimate.py         | 23 ++++++++-----
 gnuradio-examples/python/pfb/fmtest.py           | 42 ++++++++++++++++++++----
 gnuradio-examples/python/pfb/interpolate.py      | 23 ++++++++-----
 gnuradio-examples/python/pfb/resampler.py        | 34 ++++++++++++++++++-
 gnuradio-examples/python/pfb/synth_filter.py     | 14 +++++++-
 gnuradio-examples/python/pfb/synth_to_chan.py    | 14 +++++++-
 gnuradio-examples/python/tags/test_file_tags.py  | 28 +++++++++++++++-
 9 files changed, 181 insertions(+), 35 deletions(-)

(limited to 'gnuradio-examples/python')

diff --git a/gnuradio-examples/python/pfb/channelize.py b/gnuradio-examples/python/pfb/channelize.py
index f845c05c6..999e5d20e 100755
--- a/gnuradio-examples/python/pfb/channelize.py
+++ b/gnuradio-examples/python/pfb/channelize.py
@@ -21,10 +21,21 @@
 # 
 
 from gnuradio import gr, blks2
-import os, time
-import scipy, pylab
-from scipy import fftpack
-from pylab import mlab
+import sys, time
+
+try:
+    import scipy
+    from scipy import fftpack
+except ImportError:
+    print "Error: Program requires scipy (see: www.scipy.org)."
+    sys.exit(1)
+
+try:
+    import pylab
+    from pylab import mlab
+except ImportError:
+    print "Error: Program requires matplotlib (see: matplotlib.sourceforge.net)."
+    sys.exit(1)
 
 class pfb_top_block(gr.top_block):
     def __init__(self):
diff --git a/gnuradio-examples/python/pfb/chirp_channelize.py b/gnuradio-examples/python/pfb/chirp_channelize.py
index edebf5f59..951255d3b 100755
--- a/gnuradio-examples/python/pfb/chirp_channelize.py
+++ b/gnuradio-examples/python/pfb/chirp_channelize.py
@@ -21,10 +21,21 @@
 # 
 
 from gnuradio import gr, blks2
-import os, time
-import scipy, pylab
-from scipy import fftpack
-from pylab import mlab
+import sys, time
+
+try:
+    import scipy
+    from scipy import fftpack
+except ImportError:
+    print "Error: Program requires scipy (see: www.scipy.org)."
+    sys.exit(1)
+
+try:
+    import pylab
+    from pylab import mlab
+except ImportError:
+    print "Error: Program requires matplotlib (see: matplotlib.sourceforge.net)."
+    sys.exit(1)
 
 class pfb_top_block(gr.top_block):
     def __init__(self):
diff --git a/gnuradio-examples/python/pfb/decimate.py b/gnuradio-examples/python/pfb/decimate.py
index cb5d61b72..643a2c241 100755
--- a/gnuradio-examples/python/pfb/decimate.py
+++ b/gnuradio-examples/python/pfb/decimate.py
@@ -21,14 +21,21 @@
 # 
 
 from gnuradio import gr, blks2
-import os
-import scipy, pylab
-from scipy import fftpack
-from pylab import mlab
-import time
-
-#print os.getpid()
-#raw_input()
+import sys, time
+
+try:
+    import scipy
+    from scipy import fftpack
+except ImportError:
+    print "Error: Program requires scipy (see: www.scipy.org)."
+    sys.exit(1)
+
+try:
+    import pylab
+    from pylab import mlab
+except ImportError:
+    print "Error: Program requires matplotlib (see: matplotlib.sourceforge.net)."
+    sys.exit(1)
 
 class pfb_top_block(gr.top_block):
     def __init__(self):
diff --git a/gnuradio-examples/python/pfb/fmtest.py b/gnuradio-examples/python/pfb/fmtest.py
index 97df0e0f5..635ee4e9e 100755
--- a/gnuradio-examples/python/pfb/fmtest.py
+++ b/gnuradio-examples/python/pfb/fmtest.py
@@ -1,14 +1,42 @@
 #!/usr/bin/env python
 #
+# Copyright 2009 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.
+# 
+
+from gnuradio import gr, blks2
+import sys, math, time
+
+try:
+    import scipy
+    from scipy import fftpack
+except ImportError:
+    print "Error: Program requires scipy (see: www.scipy.org)."
+    sys.exit(1)
+
+try:
+    import pylab
+except ImportError:
+    print "Error: Program requires matplotlib (see: matplotlib.sourceforge.net)."
+    sys.exit(1)
 
 
-from gnuradio import gr, eng_notation
-from gnuradio import blks2
-from gnuradio.eng_option import eng_option
-from optparse import OptionParser
-import math, time, sys, scipy, pylab
-from scipy import fftpack
-
 class fmtx(gr.hier_block2):
     def __init__(self, lo_freq, audio_rate, if_rate):
 
diff --git a/gnuradio-examples/python/pfb/interpolate.py b/gnuradio-examples/python/pfb/interpolate.py
index a7a2522f8..370cf26a7 100755
--- a/gnuradio-examples/python/pfb/interpolate.py
+++ b/gnuradio-examples/python/pfb/interpolate.py
@@ -21,14 +21,21 @@
 # 
 
 from gnuradio import gr, blks2
-import os
-import scipy, pylab
-from scipy import fftpack
-from pylab import mlab
-import time
-
-#print os.getpid()
-#raw_input()
+import sys, time
+
+try:
+    import scipy
+    from scipy import fftpack
+except ImportError:
+    print "Error: Program requires scipy (see: www.scipy.org)."
+    sys.exit(1)
+
+try:
+    import pylab
+    from pylab import mlab
+except ImportError:
+    print "Error: Program requires matplotlib (see: matplotlib.sourceforge.net)."
+    sys.exit(1)
 
 class pfb_top_block(gr.top_block):
     def __init__(self):
diff --git a/gnuradio-examples/python/pfb/resampler.py b/gnuradio-examples/python/pfb/resampler.py
index 6be7cf14e..7b296ca71 100755
--- a/gnuradio-examples/python/pfb/resampler.py
+++ b/gnuradio-examples/python/pfb/resampler.py
@@ -1,7 +1,39 @@
 #!/usr/bin/env python
+#
+# Copyright 2009 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.
+# 
 
 from gnuradio import gr, blks2
-import scipy, pylab
+import sys
+
+try:
+    import scipy
+except ImportError:
+    print "Error: Program requires scipy (see: www.scipy.org)."
+    sys.exit(1)
+
+try:
+    import pylab
+except ImportError:
+    print "Error: Program requires matplotlib (see: matplotlib.sourceforge.net)."
+    sys.exit(1)
 
 class mytb(gr.top_block):
     def __init__(self, fs_in, fs_out, fc, N=10000):
diff --git a/gnuradio-examples/python/pfb/synth_filter.py b/gnuradio-examples/python/pfb/synth_filter.py
index a1562f9ea..074d9cb2c 100755
--- a/gnuradio-examples/python/pfb/synth_filter.py
+++ b/gnuradio-examples/python/pfb/synth_filter.py
@@ -21,7 +21,19 @@
 # 
 
 from gnuradio import gr, blks2
-import scipy, pylab
+import sys 
+
+try:
+    import scipy
+except ImportError:
+    print "Error: Program requires scipy (see: www.scipy.org)."
+    sys.exit(1)
+
+try:
+    import pylab
+except ImportError:
+    print "Error: Program requires matplotlib (see: matplotlib.sourceforge.net)."
+    sys.exit(1)
 
 def main():
     N = 1000000
diff --git a/gnuradio-examples/python/pfb/synth_to_chan.py b/gnuradio-examples/python/pfb/synth_to_chan.py
index 1beda1a54..7e454d903 100755
--- a/gnuradio-examples/python/pfb/synth_to_chan.py
+++ b/gnuradio-examples/python/pfb/synth_to_chan.py
@@ -21,7 +21,19 @@
 # 
 
 from gnuradio import gr, blks2
-import scipy, pylab
+import sys 
+
+try:
+    import scipy
+except ImportError:
+    print "Error: Program requires scipy (see: www.scipy.org)."
+    sys.exit(1)
+
+try:
+    import pylab
+except ImportError:
+    print "Error: Program requires matplotlib (see: matplotlib.sourceforge.net)."
+    sys.exit(1)
 
 def main():
     N = 1000000
diff --git a/gnuradio-examples/python/tags/test_file_tags.py b/gnuradio-examples/python/tags/test_file_tags.py
index 4ff4549ef..446986cd7 100755
--- a/gnuradio-examples/python/tags/test_file_tags.py
+++ b/gnuradio-examples/python/tags/test_file_tags.py
@@ -1,7 +1,33 @@
 #!/usr/bin/env python
+#
+# Copyright 2011 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.
+# 
 
 from gnuradio import gr
-import scipy
+import sys
+
+try:
+    import scipy
+except ImportError:
+    print "Error: Program requires scipy (see: www.scipy.org)."
+    sys.exit(1)
 
 def main():
     data = scipy.arange(0, 32000, 1).tolist()
-- 
cgit 


From c825caf1a86c5cefd20fdd222d915011ef43fbae Mon Sep 17 00:00:00 2001
From: Tom Rondeau
Date: Fri, 23 Sep 2011 17:21:39 -0400
Subject: examples: fixed import statements.

---
 gnuradio-examples/python/ofdm/gr_plot_ofdm.py | 20 +++++++++++++++-----
 1 file changed, 15 insertions(+), 5 deletions(-)

(limited to 'gnuradio-examples/python')

diff --git a/gnuradio-examples/python/ofdm/gr_plot_ofdm.py b/gnuradio-examples/python/ofdm/gr_plot_ofdm.py
index e3b347189..b24855148 100755
--- a/gnuradio-examples/python/ofdm/gr_plot_ofdm.py
+++ b/gnuradio-examples/python/ofdm/gr_plot_ofdm.py
@@ -20,14 +20,24 @@
 # Boston, MA 02110-1301, USA.
 # 
 
-import scipy, pylab, math
-import struct, sys
-from pylab import *
-from matplotlib.font_manager import fontManager, FontProperties
+import math, struct, sys
 from optparse import OptionParser
-from scipy import fftpack
 from math import log10
 
+try:
+    import scipy
+    from scipy import fftpack
+except ImportError:
+    print "Error: Program requires scipy (see: www.scipy.org)."
+    sys.exit(1)
+
+try:
+    from pylab import *
+    from matplotlib.font_manager import fontManager, FontProperties
+except ImportError:
+    print "Error: Program requires matplotlib (see: matplotlib.sourceforge.net)."
+    sys.exit(1)
+
 matplotlib.interactive(True)
 matplotlib.use('TkAgg')
 
-- 
cgit