From b26ea69676c09f5366a9e2f33b11ae5a7521ffe5 Mon Sep 17 00:00:00 2001
From: jcorgan
Date: Sat, 28 Apr 2007 02:20:28 +0000
Subject: Merged -r 5137:5174 from developer branch jcorgan/hb.  Trunk passes
 distcheck. Converts gr.hier_block2 API to not use 'define_component'
 methodology anymore.

git-svn-id: http://gnuradio.org/svn/gnuradio/trunk@5177 221aa14e-8319-0410-a670-987f0aec2ac5
---
 gnuradio-examples/python/hier/audio/dial_tone2.py  | 34 +++++----------
 gnuradio-examples/python/hier/dect/README          |  1 +
 .../python/hier/dect/dect_receiver.py              | 28 ++++---------
 gnuradio-examples/python/hier/dect/gmsk2.py        | 38 ++++-------------
 gnuradio-examples/python/hier/dect/usrp_source.py  |  4 +-
 gnuradio-examples/python/hier/digital/Makefile.am  |  2 +
 .../python/hier/digital/benchmark_loopback.py      | 48 ++++++----------------
 .../python/hier/digital/benchmark_rx.py            | 14 +------
 .../python/hier/digital/benchmark_tx.py            | 15 ++-----
 .../python/hier/digital/receive_path.py            | 20 +++------
 .../python/hier/digital/receive_path_lb.py         | 10 ++---
 .../python/hier/digital/transmit_path.py           | 18 ++------
 .../python/hier/digital/transmit_path_lb.py        | 11 ++---
 .../python/hier/networking/audio_sink.py           | 18 +++-----
 .../python/hier/networking/audio_source.py         | 16 +++-----
 .../python/hier/networking/dial_tone_sink.py       | 18 +++-----
 .../python/hier/networking/dial_tone_source.py     | 31 +++++---------
 .../python/hier/networking/vector_sink.py          | 14 ++-----
 .../python/hier/networking/vector_source.py        | 15 ++-----
 gnuradio-examples/python/hier/sounder/Makefile.am  |  2 +-
 .../python/hier/sounder/sounder_rx.py              |  4 +-
 .../python/hier/sounder/sounder_tx.py              |  3 +-
 gnuradio-examples/python/hier/sounder/usrp_sink.py |  5 +--
 .../python/hier/sounder/usrp_sounder_rx.py         | 29 ++++---------
 .../python/hier/sounder/usrp_sounder_tx.py         | 21 +++-------
 .../python/hier/sounder/usrp_source.py             |  4 +-
 gnuradio-examples/python/hier/usrp/usrp_fft.py     |  6 +--
 gnuradio-examples/python/hier/usrp/usrp_siggen.py  | 21 ++--------
 28 files changed, 128 insertions(+), 322 deletions(-)

(limited to 'gnuradio-examples/python/hier')

diff --git a/gnuradio-examples/python/hier/audio/dial_tone2.py b/gnuradio-examples/python/hier/audio/dial_tone2.py
index cbb187a36..3511fdba7 100755
--- a/gnuradio-examples/python/hier/audio/dial_tone2.py
+++ b/gnuradio-examples/python/hier/audio/dial_tone2.py
@@ -27,32 +27,20 @@ from optparse import OptionParser
 
 # Top-level block creating a dial tone
 # Derives from new class gr.hier_block2
-class dial_tone(gr.hier_block2):
+class dial_tone(gr.top_block):
 	def __init__(self, 
 		     sample_rate,  # Audio output sample rate (int)
 		     audio_output, # Audio output device
 		     amplitude):   # Output volume (0.0-1.0)
 
-		# Call hierarchical block constructor
-		# Top-level blocks have no inputs or outputs
-		gr.hier_block2.__init__(self, 
-					"dial_tone",		# Block type 
-					gr.io_signature(0,0,0), # Input signature
-					gr.io_signature(0,0,0)) # Output signature
+		gr.top_block.__init__(self, "dial_tone")
 
-		# Hierarchical blocks have a set of 'components' (which may
-		# be themselves hierarchical blocks), mapped to names.
-		# 'define_component' takes a string and either a hierarchical 
-		# block or an instance of a 'leaf node' (gr_block) block
+		src0 = gr.sig_source_f(sample_rate, gr.GR_SIN_WAVE, 350, amplitude)
+		src1 = gr.sig_source_f(sample_rate, gr.GR_SIN_WAVE, 440, amplitude)
+		dst  = audio.sink(sample_rate, audio_output)
 
-		# Give names to two sine wave sources and an audio sink
-		self.define_component("src0", gr.sig_source_f (sample_rate, gr.GR_SIN_WAVE, 350, amplitude))
-		self.define_component("src1", gr.sig_source_f (sample_rate, gr.GR_SIN_WAVE, 440, amplitude))
-		self.define_component("dst",  audio.sink(sample_rate, audio_output))
-
-		# Wire up outputs to inputs. (TODO: convenience functions)
-		self.connect("src0", 0, "dst", 0)	
-		self.connect("src1", 0, "dst", 1)
+		self.connect(src0, (dst, 0))	
+		self.connect(src1, (dst, 1))
 	
 if __name__ == '__main__':
 	parser = OptionParser(option_class=eng_option)
@@ -68,13 +56,13 @@ if __name__ == '__main__':
             raise SystemExit, 1
 
 	# Create an instance of a hierarchical block
-	top_block = dial_tone(int(options.sample_rate), 
-			      options.audio_output, 
-			      options.amplitude)
+	top = dial_tone(int(options.sample_rate), 
+			options.audio_output, 
+			options.amplitude)
 			      
 	# Create an instance of a runtime, passing it the top block
 	# to process
-	runtime = gr.runtime(top_block)
+	runtime = gr.runtime(top)
 
 	try:    
 		# Run forever
diff --git a/gnuradio-examples/python/hier/dect/README b/gnuradio-examples/python/hier/dect/README
index 231b1af67..c8853f185 100644
--- a/gnuradio-examples/python/hier/dect/README
+++ b/gnuradio-examples/python/hier/dect/README
@@ -5,6 +5,7 @@ digital cordless phone base stations and handsets.
 Status
 ------
 
+2007 Apr 27 - Converted to new hier_block2 format
 2007 Apr 03 - Development on hold.
 2007 Feb 11 - Added GMSK demodulation and option to log to file
 2007 Feb 10 - Able to tune and log filtered baseband to file
diff --git a/gnuradio-examples/python/hier/dect/dect_receiver.py b/gnuradio-examples/python/hier/dect/dect_receiver.py
index 491159a31..f0ec7ba0c 100644
--- a/gnuradio-examples/python/hier/dect/dect_receiver.py
+++ b/gnuradio-examples/python/hier/dect/dect_receiver.py
@@ -30,19 +30,15 @@ _dect_channel_bandwidth = 1.728e6
 
 # Top-level hierarchical block that implements DECT demodulation and
 # decoding.
-class dect_receiver(gr.hier_block2):
+class dect_receiver(gr.top_block):
     def __init__(self, options):
-	gr.hier_block2.__init__(self, 
-                                "dect_receiver",        # Block typename
-				gr.io_signature(0,0,0), # Input signature
-				gr.io_signature(0,0,0)) # Output signature
+	gr.top_block.__init__(self, "dect_receiver")
         self._options = options
 
         # Need greater than 2 samples per symbol. This makes a decimation
         # rate of 26 and a samples per symbol of 2.136752
         if_rate = 2.461538e6
-        self._usrp = usrp_source_c(self,
-                                   which=0,
+        self._usrp = usrp_source_c(which=0,
                                    subdev_spec=options.rx_subdev_spec,
                                    if_rate=if_rate,
                                    gain=options.gain,
@@ -67,25 +63,19 @@ class dect_receiver(gr.hier_block2):
         self._demod = gmsk2_demod(samples_per_symbol=if_rate/_dect_symbol_rate,
                                   verbose=options.verbose)
 
-        # Define and connect components
-        self.define_component("usrp", self._usrp)
-        self.define_component("channel", self._channel_filter)
-        self.define_component("demod", self._demod)
-        self.define_component("sink", gr.null_sink(gr.sizeof_char))
-        self.connect("usrp", 0, "channel", 0)
-        self.connect("channel", 0, "demod", 0)
-        self.connect("demod", 0, "sink", 0)
+        self._sink = gr.null_sink(gr.sizeof_char)
+        self.connect(self._usrp, self._channel_filter, self._demod, self._sink)
 
         # Log baseband to file if requested
         if options.log_baseband is not None:
             if options.verbose:
                 print "Logging baseband to file", options.log_baseband
-            self.define_component("baseband_log", gr.file_sink(gr.sizeof_gr_complex, options.log_baseband))
-            self.connect("channel", 0, "baseband_log", 0)
+            self.baseband_log = gr.file_sink(gr.sizeof_gr_complex, options.log_baseband)
+            self.connect(self._channel_filter, self.baseband_log)
 
         # Log demodulator output to file if requested
         if options.log_demod is not None:
             if options.verbose:
                 print "Logging demodulator to file", options.log_demod
-            self.define_component("demod_log", gr.file_sink(gr.sizeof_char, options.log_demod))
-            self.connect("demod", 0, "demod_log", 0)
+            self.demod_log = gr.file_sink(gr.sizeof_char, options.log_demod)
+            self.connect(self._demod, self.demod_log)
diff --git a/gnuradio-examples/python/hier/dect/gmsk2.py b/gnuradio-examples/python/hier/dect/gmsk2.py
index 578873eed..f7107241f 100644
--- a/gnuradio-examples/python/hier/dect/gmsk2.py
+++ b/gnuradio-examples/python/hier/dect/gmsk2.py
@@ -106,14 +106,7 @@ class gmsk2_mod(gr.hier_block2):
         if verbose:
             self._print_verbage()
          
-	# Define and connect components
-        self.define_component("nrz", self.nrz)
-        self.define_component("filter", self.gaussian_filter)
-        self.define_component("fmmod", self.fmmod)
-        self.connect("self", 0, "nrz", 0)
-        self.connect("nrz", 0, "filter", 0)
-        self.connect("filter", 0, "fmmod", 0)
-        self.connect("fmmod", 0, "self", 0)
+        self.connect(self, self.nrz, self.gaussian_filter, self.fmmod, self)
 
         if log:
             self._setup_logging()
@@ -125,7 +118,6 @@ class gmsk2_mod(gr.hier_block2):
         return 1
     bits_per_symbol = staticmethod(bits_per_symbol)      # make it a static method.
 
-
     def _print_verbage(self):
         print "bits per symbol = %d" % self.bits_per_symbol()
         print "Gaussian filter bt = %.2f" % self._bt
@@ -133,12 +125,9 @@ class gmsk2_mod(gr.hier_block2):
 
     def _setup_logging(self):
         print "Modulation logging turned on."
-        self.define_component("nrz_log", gr.file_sink(gr.sizeof_float, "nrz.dat"))
-        self.define_component("filter_log", gr.file_sink(gr.sizeof_float, "gaussian_filter.dat"))
-        self.define_component("fmmod_log", gr.file_sink(gr.sizeof_gr_complex, "fmmod.dat"))
-        self.connect("nrz", 0, "nrz_log", 0)
-        self.connect("filter", 0, "filter_log", 0)
-        self.connect("fmmod", 0, "fmmod_log", 0)
+        self.connect(self.nrz, gr.file_sink(gr.sizeof_float, "nrz.dat"))
+        self.connect(self.gaussian_filter, gr.file_sink(gr.sizeof_float, "gaussian_filter.dat"))
+        self.connect(self.fmmod, gr.file_sink(gr.sizeof_gr_complex, "fmmod.dat"))
 
     def add_options(parser):
         """
@@ -232,14 +221,7 @@ class gmsk2_demod(gr.hier_block2):
         if verbose:
             self._print_verbage()
 
-        # Define and connect components
-        self.define_component("fmdemod", self.fmdemod)
-        self.define_component("clock_recovery", self.clock_recovery)
-        self.define_component("slicer", self.slicer)
-        self.connect("self", 0, "fmdemod", 0)
-        self.connect("fmdemod", 0, "clock_recovery", 0)
-        self.connect("clock_recovery", 0, "slicer", 0)
-        self.connect("slicer", 0, "self", 0)
+        self.connect(self, self.fmdemod, self.clock_recovery, self.slicer, self)
 
         if log:
             self._setup_logging()
@@ -251,7 +233,6 @@ class gmsk2_demod(gr.hier_block2):
         return 1
     bits_per_symbol = staticmethod(bits_per_symbol)      # make it a static method.
 
-
     def _print_verbage(self):
         print "bits per symbol = %d" % self.bits_per_symbol()
         print "M&M clock recovery omega = %f" % self._omega
@@ -263,12 +244,9 @@ class gmsk2_demod(gr.hier_block2):
 
     def _setup_logging(self):
         print "Demodulation logging turned on."
-        self.define_component("fmdemod_log", gr.file_sink(gr.sizeof_float, "fmdemod.dat"))
-        self.define_component("clock_recovery_log", gr.file_sink(gr.sizeof_float, "clock_recovery.dat"))
-        self.define_component("slicer_log", gr.file_sink(gr.sizeof_char, "slicer.dat"))
-        self.connect("fmdemod", 0, "fmdemod_log", 0)
-        self.connect("clock_recovery", 0, "clock_recovery_log", 0)
-        self.connect("slicer", 0, "slicer_log", 0)
+        self.connect(fmdemod, gr.file_sink(gr.sizeof_float, "fmdemod.dat"))
+        self.connect(clock_recovery, gr.file_sink(gr.sizeof_float, "clock_recovery.dat"))
+        self.connect(slicer, gr.file_sink(gr.sizeof_char, "slicer.dat"))
 
     def add_options(parser):
         """
diff --git a/gnuradio-examples/python/hier/dect/usrp_source.py b/gnuradio-examples/python/hier/dect/usrp_source.py
index 16949998b..9226f9206 100644
--- a/gnuradio-examples/python/hier/dect/usrp_source.py
+++ b/gnuradio-examples/python/hier/dect/usrp_source.py
@@ -47,9 +47,7 @@ class usrp_source_c(gr.hier_block2):
         self.set_gain(gain)
         self.set_calibration(calibration)
         self.tune(freq)
-
-        self.define_component("usrp", self._u)
-        self.connect("usrp", 0, "self", 0)
+        self.connect(self._u, self)
 
     def set_subdev(self, subdev_spec):
         if subdev_spec is None:
diff --git a/gnuradio-examples/python/hier/digital/Makefile.am b/gnuradio-examples/python/hier/digital/Makefile.am
index 9cdbc7121..5a098eea7 100644
--- a/gnuradio-examples/python/hier/digital/Makefile.am
+++ b/gnuradio-examples/python/hier/digital/Makefile.am
@@ -33,3 +33,5 @@ EXTRA_DIST =			\
 	transmit_path_lb.py	\
 	tunnel.py		\
 	tx_voice.py		
+
+MOSTLYCLEANFILES = *~ *.pyc *.dat
diff --git a/gnuradio-examples/python/hier/digital/benchmark_loopback.py b/gnuradio-examples/python/hier/digital/benchmark_loopback.py
index 92a7bb072..f560468d7 100755
--- a/gnuradio-examples/python/hier/digital/benchmark_loopback.py
+++ b/gnuradio-examples/python/hier/digital/benchmark_loopback.py
@@ -1,7 +1,7 @@
 #!/usr/bin/env python
 #!/usr/bin/env python
 #
-# Copyright 2005, 2006 Free Software Foundation, Inc.
+# Copyright 2005, 2006,2007 Free Software Foundation, Inc.
 # 
 # This file is part of GNU Radio
 # 
@@ -45,27 +45,23 @@ class awgn_channel(gr.hier_block2):
         else:
             rseed = int(time.time())
             self.noise = gr.noise_source_c(gr.GR_GAUSSIAN, noise_voltage, rseed)
-        self.define_component("noise", self.noise)
-        self.define_component("adder", gr.add_cc())
+        self.adder = gr.add_cc()
 
         # Create the frequency offset
-        self.define_component("offset", gr.sig_source_c((sample_rate*1.0), gr.GR_SIN_WAVE,
-                                                        frequency_offset, 1.0, 0.0))
-        self.define_component("mixer", gr.multiply_cc())
+        self.offset = gr.sig_source_c((sample_rate*1.0), gr.GR_SIN_WAVE, frequency_offset, 1.0, 0.0)
+        self.mixer = gr.multiply_cc()
 
         # Connect the components
-        self.connect("self", 0, "mixer", 0)
-        self.connect("offset", 0, "mixer", 1)
-        self.connect("mixer", 0, "adder", 0)
-        self.connect("noise", 0, "adder", 1)
-        self.connect("adder", 0, "self", 0)
+        self.connect(self,        (self.mixer, 0))
+        self.connect(self.offset, (self.mixer, 1))
+        self.connect(self.mixer,  (self.adder, 0))
+        self.connect(self.noise,  (self.adder, 1))
+        self.connect(self.adder,   self)
 
 
-class my_graph(gr.hier_block2):
+class my_graph(gr.top_block):
     def __init__(self, mod_class, demod_class, rx_callback, options):
-        gr.hier_block2.__init__(self, "my_graph",
-                                gr.io_signature(0,0,0), # Input signature
-                                gr.io_signature(0,0,0)) # Output signature
+        gr.top_block.__init__(self, "my_graph")
 
         channelon = True;
 
@@ -82,27 +78,9 @@ class my_graph(gr.hier_block2):
 
         if channelon:
             self.channel = awgn_channel(options.sample_rate, noise_voltage, frequency_offset, options.seed)
-
-            # Define the components
-            self.define_component("txpath", self.txpath)
-            self.define_component("throttle", self.throttle)
-            self.define_component("channel", self.channel)
-            self.define_component("rxpath", self.rxpath)
-            
-            # Connect components
-            self.connect("txpath", 0, "throttle", 0)
-            self.connect("throttle", 0, "channel", 0)
-            self.connect("channel", 0, "rxpath", 0)
+            self.connect(self.txpath, self.throttle, self.channel, self.rxpath)
         else:
-            # Define the components
-            self.define_component("txpath", self.txpath)
-            self.define_component("throttle", self.throttle)
-            self.define_component("rxpath", self.rxpath)
-        
-            # Connect components
-            self.connect("txpath", 0, "throttle", 0)
-            self.connect("throttle", 0, "rxpath", 0)
-
+            self.connect(self.txpath, self.throttle, self.rxpath)
 
 # /////////////////////////////////////////////////////////////////////////////
 #                                   main
diff --git a/gnuradio-examples/python/hier/digital/benchmark_rx.py b/gnuradio-examples/python/hier/digital/benchmark_rx.py
index f65a634a3..3de328a3d 100755
--- a/gnuradio-examples/python/hier/digital/benchmark_rx.py
+++ b/gnuradio-examples/python/hier/digital/benchmark_rx.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 #
-# Copyright 2005,2006 Free Software Foundation, Inc.
+# Copyright 2005,2006,2007 Free Software Foundation, Inc.
 # 
 # This file is part of GNU Radio
 # 
@@ -38,16 +38,6 @@ import fusb_options
 #print os.getpid()
 #raw_input('Attach and press enter: ')
 
-
-class my_graph(gr.hier_block2):
-    def __init__(self, demod_class, rx_callback, options):
-        gr.hier_block2.__init__(self, "my_graph",
-                                gr.io_signature(0,0,0), # Input signature
-                                gr.io_signature(0,0,0)) # Output signature
-        self.rxpath = receive_path(demod_class, rx_callback, options)
-        self.define_component("rxpath", self.rxpath)
-
-
 # /////////////////////////////////////////////////////////////////////////////
 #                                   main
 # /////////////////////////////////////////////////////////////////////////////
@@ -104,7 +94,7 @@ def main():
         print "Warning: Failed to enable realtime scheduling."
 
     # Create an instance of a hierarchical block
-    top_block = my_graph(demods[options.modulation], rx_callback, options)
+    top_block = receive_path(demods[options.modulation], rx_callback, options)
     
     # Create an instance of a runtime, passing it the top block
     runtime = gr.runtime(top_block)
diff --git a/gnuradio-examples/python/hier/digital/benchmark_tx.py b/gnuradio-examples/python/hier/digital/benchmark_tx.py
index 627c92b3a..df4a2005d 100755
--- a/gnuradio-examples/python/hier/digital/benchmark_tx.py
+++ b/gnuradio-examples/python/hier/digital/benchmark_tx.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 #
-# Copyright 2005, 2006 Free Software Foundation, Inc.
+# Copyright 2005, 2006,2007 Free Software Foundation, Inc.
 # 
 # This file is part of GNU Radio
 # 
@@ -36,15 +36,6 @@ import fusb_options
 #print os.getpid()
 #raw_input('Attach and press enter')
 
-class my_graph(gr.hier_block2):
-    def __init__(self, mod_class, options):
-        gr.hier_block2.__init__(self, "my_graph",
-                                gr.io_signature(0,0,0), # Input signature
-                                gr.io_signature(0,0,0)) # Output signature
-        self.txpath = transmit_path(mod_class, options)
-        self.define_component("txpath", self.txpath)
-
-
 # /////////////////////////////////////////////////////////////////////////////
 #                                   main
 # /////////////////////////////////////////////////////////////////////////////
@@ -52,7 +43,7 @@ class my_graph(gr.hier_block2):
 def main():
 
     def send_pkt(payload='', eof=False):
-        return top_block.txpath.send_pkt(payload, eof)
+        return top_block.send_pkt(payload, eof)
 
     def rx_callback(ok, payload):
         print "ok = %r, payload = '%s'" % (ok, payload)
@@ -96,7 +87,7 @@ def main():
         print "Warning: failed to enable realtime scheduling"
 
     # Create an instance of a hierarchical block
-    top_block = my_graph(mods[options.modulation], options)
+    top_block = transmit_path(mods[options.modulation], options)
     
     # Create an instance of a runtime, passing it the top block
     runtime = gr.runtime(top_block)
diff --git a/gnuradio-examples/python/hier/digital/receive_path.py b/gnuradio-examples/python/hier/digital/receive_path.py
index 64a547dce..fce7db162 100644
--- a/gnuradio-examples/python/hier/digital/receive_path.py
+++ b/gnuradio-examples/python/hier/digital/receive_path.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 #
-# Copyright 2005,2006 Free Software Foundation, Inc.
+# Copyright 2005,2006,2007 Free Software Foundation, Inc.
 # 
 # This file is part of GNU Radio
 # 
@@ -33,12 +33,9 @@ from pick_bitrate import pick_rx_bitrate
 #                              receive path
 # /////////////////////////////////////////////////////////////////////////////
 
-class receive_path(gr.hier_block2):
+class receive_path(gr.top_block):
     def __init__(self, demod_class, rx_callback, options):
-        gr.hier_block2.__init__(self, "receive_path",
-                                gr.io_signature(0,0,0), # Input signature
-                                gr.io_signature(0,0,0)) # Output signature
-
+        gr.top_block.__init__(self, "receive_path")
         options = copy.copy(options)    # make a copy so we can destructively modify
 
         self._verbose            = options.verbose
@@ -112,18 +109,13 @@ class receive_path(gr.hier_block2):
         if self._verbose:
             self._print_verbage()
             
-        # Define the components
-        self.define_component("usrp", self.u)
-        self.define_component("channel_filter", gr.fft_filter_ccc(sw_decim, chan_coeffs))
-        self.define_component("channel_probe", self.probe)
-        self.define_component("packet_receiver", self.packet_receiver)
+        self.channel_filter = gr.fft_filter_ccc(sw_decim, chan_coeffs)
 
         # connect the channel input filter to the carrier power detector
-        self.connect("usrp", 0, "channel_filter", 0)
-        self.connect("channel_filter", 0, "channel_probe", 0)
+        self.connect(self.u, self.channel_filter, self.probe)
 
         # connect channel filter to the packet receiver
-        self.connect("channel_filter", 0, "packet_receiver", 0)
+        self.connect(self.channel_filter, self.packet_receiver)
         
 
     def _setup_usrp_source(self):
diff --git a/gnuradio-examples/python/hier/digital/receive_path_lb.py b/gnuradio-examples/python/hier/digital/receive_path_lb.py
index fada441ff..69d721df3 100644
--- a/gnuradio-examples/python/hier/digital/receive_path_lb.py
+++ b/gnuradio-examples/python/hier/digital/receive_path_lb.py
@@ -71,17 +71,13 @@ class receive_path(gr.hier_block2):
         if self._verbose:
             self._print_verbage()
 
-        # Define the components
-        self.define_component("channel_filter", gr.fft_filter_ccc(sw_decim, chan_coeffs))
-        self.define_component("channel_probe", self.probe)
-        self.define_component("packet_receiver", self.packet_receiver)
+        self.channel_filter = gr.fft_filter_ccc(sw_decim, chan_coeffs)
 
         # connect the channel input filter to the carrier power detector
-        self.connect("self", 0, "channel_filter", 0)
-        self.connect("channel_filter", 0, "channel_probe", 0)
+	self.connect(self, self.channel_filter, self.probe)
 
         # connect channel filter to the packet receiver
-        self.connect("channel_filter", 0, "packet_receiver", 0)
+        self.connect(self.channel_filter, self.packet_receiver)
         
     def bitrate(self):
         return self._bitrate
diff --git a/gnuradio-examples/python/hier/digital/transmit_path.py b/gnuradio-examples/python/hier/digital/transmit_path.py
index c517210ae..4ed477ea1 100644
--- a/gnuradio-examples/python/hier/digital/transmit_path.py
+++ b/gnuradio-examples/python/hier/digital/transmit_path.py
@@ -1,5 +1,5 @@
 #
-# Copyright 2005,2006 Free Software Foundation, Inc.
+# Copyright 2005,2006,2007 Free Software Foundation, Inc.
 # 
 # This file is part of GNU Radio
 # 
@@ -33,16 +33,13 @@ from pick_bitrate import pick_tx_bitrate
 #                              transmit path
 # /////////////////////////////////////////////////////////////////////////////
 
-class transmit_path(gr.hier_block2): 
+class transmit_path(gr.top_block): 
     def __init__(self, modulator_class, options):
         '''
         See below for what options should hold
         '''
         
-        gr.hier_block2.__init__(self, "transmit_path",
-                                gr.io_signature(0,0,0), # Input signature
-                                gr.io_signature(0,0,0)) # Output signature
-
+        gr.top_block.__init__(self, "transmit_path")
         options = copy.copy(options)    # make a copy so we can destructively modify
 
         self._verbose            = options.verbose
@@ -99,14 +96,7 @@ class transmit_path(gr.hier_block2):
         if self._verbose:
             self._print_verbage()
 
-        # Define the components
-        self.define_component("packet_transmitter", self.packet_transmitter)
-        self.define_component("amp", self.amp)
-        self.define_component("usrp", self.u)
-
-        # Connect components in the flowgraph; set amp component to the output of this block
-        self.connect("packet_transmitter", 0, "amp", 0)
-        self.connect("amp", 0, "usrp", 0)
+        self.connect(self.packet_transmitter, self.amp, self.u)
 
     def _setup_usrp_sink(self):
         """
diff --git a/gnuradio-examples/python/hier/digital/transmit_path_lb.py b/gnuradio-examples/python/hier/digital/transmit_path_lb.py
index 7bf4b6057..424eafdee 100644
--- a/gnuradio-examples/python/hier/digital/transmit_path_lb.py
+++ b/gnuradio-examples/python/hier/digital/transmit_path_lb.py
@@ -1,5 +1,5 @@
 #
-# Copyright 2005,2006 Free Software Foundation, Inc.
+# Copyright 2005,2006,2007 Free Software Foundation, Inc.
 # 
 # This file is part of GNU Radio
 # 
@@ -65,13 +65,8 @@ class transmit_path(gr.hier_block2):
         if self._verbose:
             self._print_verbage()
 
-        # Define the components
-        self.define_component("packet_transmitter", self.packet_transmitter)
-        self.define_component("amp", self.amp)
-
-        # Connect components in the flowgraph; set amp component to the output of this block
-        self.connect("packet_transmitter", 0, "amp", 0)
-        self.connect("amp", 0, "self", 0)
+        # Connect blocks in the flowgraph; set amp component to the output of this block
+        self.connect(self.packet_transmitter, self.amp, self)
 
     def set_tx_amplitude(self, ampl):
         """
diff --git a/gnuradio-examples/python/hier/networking/audio_sink.py b/gnuradio-examples/python/hier/networking/audio_sink.py
index 1b182e97e..4e5f64760 100755
--- a/gnuradio-examples/python/hier/networking/audio_sink.py
+++ b/gnuradio-examples/python/hier/networking/audio_sink.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 #
-# Copyright 2006 Free Software Foundation, Inc.
+# Copyright 2006,2007 Free Software Foundation, Inc.
 # 
 # This file is part of GNU Radio
 # 
@@ -24,18 +24,12 @@ from gnuradio import gr, audio
 from gnuradio.eng_option import eng_option
 from optparse import OptionParser
 
-class audio_sink(gr.hier_block2):
+class audio_sink(gr.top_block):
     def __init__(self, src, port, pkt_size, sample_rate):
-        gr.hier_block2.__init__(self, 
-                                "audio_sink",	# Block type 
-                                gr.io_signature(0,0,0), # Input signature
-                                gr.io_signature(0,0,0)) # Output signature
-
-
-        self.define_component("src",  gr.udp_source(gr.sizeof_float, src, port, pkt_size))
-        self.define_component("dst",  audio.sink(sample_rate))
-
-        self.connect("src", 0, "dst", 0)
+        gr.top_block.__init__(self, "audio_sink")
+        src = gr.udp_source(gr.sizeof_float, src, port, pkt_size)
+        dst = audio.sink(sample_rate)
+        self.connect(src, dst)
         
 if __name__ == '__main__':
     parser = OptionParser(option_class=eng_option)
diff --git a/gnuradio-examples/python/hier/networking/audio_source.py b/gnuradio-examples/python/hier/networking/audio_source.py
index 24186895a..168e1cba9 100755
--- a/gnuradio-examples/python/hier/networking/audio_source.py
+++ b/gnuradio-examples/python/hier/networking/audio_source.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 #
-# Copyright 2006 Free Software Foundation, Inc.
+# Copyright 2006,2007 Free Software Foundation, Inc.
 # 
 # This file is part of GNU Radio
 # 
@@ -24,16 +24,12 @@ from gnuradio import gr, audio
 from gnuradio.eng_option import eng_option
 from optparse import OptionParser
 
-class audio_source(gr.hier_block2):
+class audio_source(gr.top_block):
     def __init__(self, src, dst, port, pkt_size, sample_rate):
-        gr.hier_block2.__init__(self, 
-                                "audio_source",	# Block type 
-                                gr.io_signature(0,0,0), # Input signature
-                                gr.io_signature(0,0,0)) # Output signature
-
-        self.define_component("src", audio.source(sample_rate))
-	self.define_component("dst",  gr.udp_sink(gr.sizeof_float, src, 0, dst, port, pkt_size))
-        self.connect("src", 0, "dst", 0)
+        gr.top_block.__init__(self, "audio_source")
+        self.audio = audio.source(sample_rate)
+	self.sink = gr.udp_sink(gr.sizeof_float, src, 0, dst, port, pkt_size)
+        self.connect(self.audio, self.sink)
 
 if __name__ == '__main__':
     parser = OptionParser(option_class=eng_option)
diff --git a/gnuradio-examples/python/hier/networking/dial_tone_sink.py b/gnuradio-examples/python/hier/networking/dial_tone_sink.py
index 95419fbc9..de0db14d8 100755
--- a/gnuradio-examples/python/hier/networking/dial_tone_sink.py
+++ b/gnuradio-examples/python/hier/networking/dial_tone_sink.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 #
-# Copyright 2006 Free Software Foundation, Inc.
+# Copyright 2006,2007 Free Software Foundation, Inc.
 # 
 # This file is part of GNU Radio
 # 
@@ -24,18 +24,12 @@ from gnuradio import gr, audio
 from gnuradio.eng_option import eng_option
 from optparse import OptionParser
 
-class dial_tone_sink(gr.hier_block2):
+class dial_tone_sink(gr.top_block):
     def __init__(self, src, port, pkt_size, sample_rate):
-        gr.hier_block2.__init__(self, 
-                                "dial_tone_sink",	# Block type 
-                                gr.io_signature(0,0,0), # Input signature
-                                gr.io_signature(0,0,0)) # Output signature
-
-
-        self.define_component("src",  gr.udp_source(gr.sizeof_float, src, port, pkt_size))
-        self.define_component("dst",  audio.sink(sample_rate))
-
-        self.connect("src", 0, "dst", 0)
+        gr.top_block.__init__(self, "dial_tone_sink")
+        udp = gr.udp_source(gr.sizeof_float, src, port, pkt_size)
+        sink = audio.sink(sample_rate)
+        self.connect(udp, sink)
         
 if __name__ == '__main__':
     parser = OptionParser(option_class=eng_option)
diff --git a/gnuradio-examples/python/hier/networking/dial_tone_source.py b/gnuradio-examples/python/hier/networking/dial_tone_source.py
index 40cb93553..5ef4f25d6 100755
--- a/gnuradio-examples/python/hier/networking/dial_tone_source.py
+++ b/gnuradio-examples/python/hier/networking/dial_tone_source.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 #
-# Copyright 2006 Free Software Foundation, Inc.
+# Copyright 2006,2007 Free Software Foundation, Inc.
 # 
 # This file is part of GNU Radio
 # 
@@ -24,30 +24,21 @@ from gnuradio import gr
 from gnuradio.eng_option import eng_option
 from optparse import OptionParser
 
-class dial_tone_source(gr.hier_block2):
+class dial_tone_source(gr.top_block):
     def __init__(self, src, dst, port, pkt_size, sample_rate):
-        gr.hier_block2.__init__(self, 
-                                "dial_tone_source",	# Block type 
-                                gr.io_signature(0,0,0), # Input signature
-                                gr.io_signature(0,0,0)) # Output signature
+        gr.top_block.__init__(self, "dial_tone_source")
 
         amplitude = 0.3
-        self.define_component("src0", gr.sig_source_f (sample_rate, gr.GR_SIN_WAVE,
-                                                       350, amplitude))
-        self.define_component("src1", gr.sig_source_f (sample_rate, gr.GR_SIN_WAVE,
-                                                       440, amplitude))
-        self.define_component("add", gr.add_ff())
+        src0 = gr.sig_source_f (sample_rate, gr.GR_SIN_WAVE, 350, amplitude)
+        src1 = gr.sig_source_f (sample_rate, gr.GR_SIN_WAVE, 440, amplitude)
+        add = gr.add_ff()
 
         # Throttle needed here to account for the other side's audio card sampling rate
-	self.define_component("thr", gr.throttle(gr.sizeof_float, sample_rate))
-	self.define_component("dst",  gr.udp_sink(gr.sizeof_float, src, 0, dst, port, pkt_size))
-
-        self.connect("src0", 0, "add", 0)	
-        self.connect("src1", 0, "add", 1)
-	self.connect("add", 0, "thr", 0)
-	self.connect("thr", 0, "dst", 0)
-        
-
+	thr = gr.throttle(gr.sizeof_float, sample_rate)
+	sink = gr.udp_sink(gr.sizeof_float, src, 0, dst, port, pkt_size)
+	self.connect(src0, (add, 0))
+	self.connect(src1, (add, 1))
+	self.connect(add, thr, sink)
 
 if __name__ == '__main__':
     parser = OptionParser(option_class=eng_option)
diff --git a/gnuradio-examples/python/hier/networking/vector_sink.py b/gnuradio-examples/python/hier/networking/vector_sink.py
index 54578078f..35ea36e63 100755
--- a/gnuradio-examples/python/hier/networking/vector_sink.py
+++ b/gnuradio-examples/python/hier/networking/vector_sink.py
@@ -24,19 +24,13 @@ from gnuradio import gr
 from gnuradio.eng_option import eng_option
 from optparse import OptionParser
 
-class vector_sink(gr.hier_block2):
+class vector_sink(gr.top_block):
     def __init__(self, src, port, pkt_size):
-        gr.hier_block2.__init__(self, 
-                                "vector_sink",	        # Block type 
-                                gr.io_signature(0,0,0), # Input signature
-                                gr.io_signature(0,0,0)) # Output signature
+        gr.top_block.__init__(self, "vector_sink")
 
         udp = gr.udp_source(gr.sizeof_float, src, port, pkt_size)
-        
-        self.define_component("src", udp)
-        self.define_component("dst", gr.file_sink(gr.sizeof_float, "received.dat"))
-
-        self.connect("src", 0, "dst", 0)	
+        sink = gr.file_sink(gr.sizeof_float, "received.dat")
+        self.connect(udp, sink)
 
 if __name__ == "__main__":
     parser = OptionParser(option_class=eng_option)
diff --git a/gnuradio-examples/python/hier/networking/vector_source.py b/gnuradio-examples/python/hier/networking/vector_source.py
index d31a0baa2..ad3c31be7 100755
--- a/gnuradio-examples/python/hier/networking/vector_source.py
+++ b/gnuradio-examples/python/hier/networking/vector_source.py
@@ -24,20 +24,13 @@ from gnuradio import gr
 from gnuradio.eng_option import eng_option
 from optparse import OptionParser
 
-class vector_source(gr.hier_block2):
+class vector_source(gr.top_block):
     def __init__(self, src, dst, port, pkt_size):
-        gr.hier_block2.__init__(self, 
-                                "vector_source",	# Block type 
-                                gr.io_signature(0,0,0), # Input signature
-                                gr.io_signature(0,0,0)) # Output signature
-
+        gr.top_block.__init__(self, "vector_source")
         data = [i*0.01 for i in range(1000)]
-        self.define_component("data", gr.vector_source_f(data, True))
-
+        vec = gr.vector_source_f(data, True)
         udp = gr.udp_sink(gr.sizeof_float, src, 0, dst, port, pkt_size)
-        self.define_component("dst",  udp)
-
-        self.connect("data", 0, "dst", 0)
+        self.connect(vec, udp)
 
 if __name__ == '__main__':
     parser = OptionParser(option_class=eng_option)
diff --git a/gnuradio-examples/python/hier/sounder/Makefile.am b/gnuradio-examples/python/hier/sounder/Makefile.am
index ecbbb4718..1d26e0cb7 100644
--- a/gnuradio-examples/python/hier/sounder/Makefile.am
+++ b/gnuradio-examples/python/hier/sounder/Makefile.am
@@ -27,4 +27,4 @@ EXTRA_DIST = 			\
 	sounder_rx.py		\
 	sounder_tx.py
 
-MOSTLYCLEANFILES = *.pyc *~
+MOSTLYCLEANFILES = *.pyc *~ *.dat
diff --git a/gnuradio-examples/python/hier/sounder/sounder_rx.py b/gnuradio-examples/python/hier/sounder/sounder_rx.py
index 336e604a3..e1b64001b 100644
--- a/gnuradio-examples/python/hier/sounder/sounder_rx.py
+++ b/gnuradio-examples/python/hier/sounder/sounder_rx.py
@@ -50,6 +50,4 @@ class sounder_rx(gr.hier_block2):
             print "Using PN sequence of degree", self._degree, "length", self._length
             print "Sequence repetition rate is", n2s(self._rep_rate), "per sec"
         
-        self.define_component("corr", gr.pn_correlator_cc(self._degree))
-        self.connect("self", 0, "corr", 0)
-        self.connect("corr", 0, "self", 0)
+        self.connect(self, gr.pn_correlator_cc(self._degree), self)
diff --git a/gnuradio-examples/python/hier/sounder/sounder_tx.py b/gnuradio-examples/python/hier/sounder/sounder_tx.py
index 7d91f36e1..c6810b01a 100644
--- a/gnuradio-examples/python/hier/sounder/sounder_tx.py
+++ b/gnuradio-examples/python/hier/sounder/sounder_tx.py
@@ -42,5 +42,4 @@ class sounder_tx(gr.hier_block2):
         self._length = 2**degree-1
         
         # Connect PN source to block output
-        self.define_component("glfsr", gr.glfsr_source_f(degree))
-        self.connect("glfsr", 0, "self", 0)
+        self.connect(gr.glfsr_source_f(degree), self)
diff --git a/gnuradio-examples/python/hier/sounder/usrp_sink.py b/gnuradio-examples/python/hier/sounder/usrp_sink.py
index 000b831f5..03a987d41 100644
--- a/gnuradio-examples/python/hier/sounder/usrp_sink.py
+++ b/gnuradio-examples/python/hier/sounder/usrp_sink.py
@@ -46,10 +46,7 @@ class usrp_sink_c(gr.hier_block2):
         self.set_if_rate(if_rate)
         self.set_calibration(calibration)
         self.tune(freq)
-
-        self.define_component("usrp", self._u)
-        self.connect("self", 0, "usrp", 0)
-
+        self.connect(self, self._u)
 
     def set_subdev(self, subdev_spec):
         if subdev_spec is None:
diff --git a/gnuradio-examples/python/hier/sounder/usrp_sounder_rx.py b/gnuradio-examples/python/hier/sounder/usrp_sounder_rx.py
index 72ebeccfa..094ae4bcd 100755
--- a/gnuradio-examples/python/hier/sounder/usrp_sounder_rx.py
+++ b/gnuradio-examples/python/hier/sounder/usrp_sounder_rx.py
@@ -28,12 +28,9 @@ from sounder_rx import sounder_rx
 
 n2s = eng_notation.num_to_str
 
-class usrp_sounder_rx(gr.hier_block2):
+class usrp_sounder_rx(gr.top_block):
     def __init__(self, options):
-        gr.hier_block2.__init__(self, "usrp_sounder_rx",
-                                gr.io_signature(0,0,0),
-                                gr.io_signature(0,0,0))
-
+        gr.top_block.__init__(self, "usrp_sounder_rx")
         self._options = options
         self._u = usrp_source_c(0,
                                 self._options.rx_subdev_spec,
@@ -50,22 +47,14 @@ class usrp_sounder_rx(gr.hier_block2):
 
         samples = 100 * self._length**2
 
-        self.define_component("usrp", self._u)
-        self.define_component("head", gr.head(gr.sizeof_gr_complex, samples))
-	self.define_component("rx",   self._receiver)
-        self.define_component("c2m",  gr.complex_to_mag())
-        self.define_component("s2v",  gr.stream_to_vector(gr.sizeof_float, self._length))
-        self.define_component("lpf",  gr.single_pole_iir_filter_ff(self._options.alpha, self._length))
-        self.define_component("v2s",  gr.vector_to_stream(gr.sizeof_float, self._length))
-        self.define_component("sink", gr.file_sink(gr.sizeof_float, "impulse.dat"))
+        head = gr.head(gr.sizeof_gr_complex, samples)
+        c2m = gr.complex_to_mag()
+        s2v = gr.stream_to_vector(gr.sizeof_float, self._length)
+        lpf = gr.single_pole_iir_filter_ff(self._options.alpha, self._length)
+        v2s = gr.vector_to_stream(gr.sizeof_float, self._length)
+        sink = gr.file_sink(gr.sizeof_float, "impulse.dat")
 
-        self.connect("usrp", 0, "head", 0)
-        self.connect("head", 0, "rx", 0)
-        self.connect("rx", 0, "c2m", 0)
-        self.connect("c2m", 0, "s2v", 0)
-        self.connect("s2v", 0, "lpf", 0)
-        self.connect("lpf", 0, "v2s", 0)
-        self.connect("v2s", 0, "sink", 0)
+	self.connect(self._u, head, self._receiver, c2m, s2v, lpf, v2s, sink)
 
 	if self._options.verbose:
             print "Chip rate is", n2s(self._options.chip_rate), "chips/sec"
diff --git a/gnuradio-examples/python/hier/sounder/usrp_sounder_tx.py b/gnuradio-examples/python/hier/sounder/usrp_sounder_tx.py
index 00146146c..e1ee5b844 100755
--- a/gnuradio-examples/python/hier/sounder/usrp_sounder_tx.py
+++ b/gnuradio-examples/python/hier/sounder/usrp_sounder_tx.py
@@ -28,16 +28,12 @@ from sounder_tx import sounder_tx
 
 n2s = eng_notation.num_to_str
 
-class usrp_sounder_tx(gr.hier_block2):
+class usrp_sounder_tx(gr.top_block):
     def __init__(self, subdev_spec, freq, cal, verbose, degree, chip_rate, amplitude):
 
         # Call hierarchical block constructor
         # Top-level blocks have no inputs or outputs
-        gr.hier_block2.__init__(self,
-                                "usrp_sounder_tx",      # Block typename
-                                gr.io_signature(0,0,0), # Input signature
-                                gr.io_signature(0,0,0)) # Output signature
-
+        gr.top_block.__init__(self, "usrp_sounder_tx")
         self._freq = freq
         self._cal = cal
         self._verbose = verbose
@@ -46,12 +42,12 @@ class usrp_sounder_tx(gr.hier_block2):
 	self._amplitude = amplitude
 	
         self._u = usrp_sink_c(0, subdev_spec, chip_rate, self._freq, self._cal, self._verbose)
-	self.define_component("usrp", self._u)
         self._chip_rate = self._u._if_rate
         self._max_time = float(self._length)/self._chip_rate
-	self.define_component("pn", sounder_tx(self._degree, self._chip_rate, self._verbose))
-        self.define_component("gain", gr.multiply_const_ff(amplitude));
-        self.define_component("f2c", gr.float_to_complex())
+	self._pn = sounder_tx(self._degree, self._chip_rate, self._verbose)
+        self._gain = gr.multiply_const_ff(amplitude)
+        self._f2c = gr.float_to_complex()
+	self.connect(self._pn, self._gain, self._f2c, self._u)
         
         if self._verbose:
             print "Chip rate is", n2s(self._chip_rate), "chips/sec"
@@ -60,11 +56,6 @@ class usrp_sounder_tx(gr.hier_block2):
             print "Maximum measurable impulse response is", n2s(self._max_time), "sec"
             print "Output amplitude is", amplitude
 
-	# Ultimately this will be
-	# self.connect("pn gain f2c usrp")
-	self.connect("pn", 0, "gain", 0)
-        self.connect("gain", 0, "f2c", 0)
-        self.connect("f2c", 0, "usrp", 0)
                               
 def main():
 	parser = OptionParser(option_class=eng_option)
diff --git a/gnuradio-examples/python/hier/sounder/usrp_source.py b/gnuradio-examples/python/hier/sounder/usrp_source.py
index 0ba9e6161..9dc471d9e 100644
--- a/gnuradio-examples/python/hier/sounder/usrp_source.py
+++ b/gnuradio-examples/python/hier/sounder/usrp_source.py
@@ -47,9 +47,7 @@ class usrp_source_c(gr.hier_block2):
         self.set_gain(gain)
         self.set_calibration(calibration)
         self.tune(freq)
-
-        self.define_component("usrp", self._u)
-        self.connect("usrp", 0, "self", 0)
+        self.connect(self._u, self)
 
     def set_subdev(self, subdev_spec):
         if subdev_spec is None:
diff --git a/gnuradio-examples/python/hier/usrp/usrp_fft.py b/gnuradio-examples/python/hier/usrp/usrp_fft.py
index 5cd5c1482..b31213004 100755
--- a/gnuradio-examples/python/hier/usrp/usrp_fft.py
+++ b/gnuradio-examples/python/hier/usrp/usrp_fft.py
@@ -74,7 +74,6 @@ class app_top_block(stdgui2.std_top_block):
         self.show_debug_info = True
         
         self.u = usrp.source_c(decim_rate=options.decim)
-        self.define_component("usrp", self.u)
         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))
@@ -99,11 +98,8 @@ class app_top_block(stdgui2.std_top_block):
             self.scope = scopesink2.scope_sink_c(panel, sample_rate=input_rate)
         else:
     	    self.scope = fftsink2.fft_sink_c (panel, fft_size=1024, sample_rate=input_rate)
-        self.define_component("scope", self.scope)
 
-        # Ultimately this will be
-        # self.connect("usrp scope")
-        self.connect("usrp", 0, "scope", 0)
+        self.connect(self.u, self.scope)
 
         self._build_gui(vbox)
 
diff --git a/gnuradio-examples/python/hier/usrp/usrp_siggen.py b/gnuradio-examples/python/hier/usrp/usrp_siggen.py
index 28f80a822..f1eb2a6bc 100755
--- a/gnuradio-examples/python/hier/usrp/usrp_siggen.py
+++ b/gnuradio-examples/python/hier/usrp/usrp_siggen.py
@@ -7,15 +7,9 @@ from gnuradio import eng_notation
 from optparse import OptionParser
 import sys
 
-
-class my_graph(gr.hier_block2):
+class my_graph(gr.top_block):
     def __init__ (self, type, ampl, wfreq, offset, subdev_spec, interp, rf_freq):
-        # Call hierarchical block constructor
-        # Top-level blocks have no inputs or outputs
-        gr.hier_block2.__init__(self, 
-                                "usrp_siggen",		# Block type 
-                                gr.io_signature(0,0,0), # Input signature
-                                gr.io_signature(0,0,0)) # Output signature
+        gr.top_block.__init__(self, "usrp_siggen")
         
         # controllable values
         self.interp = interp
@@ -40,28 +34,21 @@ class my_graph(gr.hier_block2):
             sys.stderr.write('Failed to set RF frequency\n')
             raise SystemExit
 
-        self.define_component("usrp", self.u)
-
         if type == gr.GR_SIN_WAVE or type == gr.GR_CONST_WAVE:
             self.src = gr.sig_source_c (self.usb_freq (),
                                         gr.GR_SIN_WAVE,
                                         self.waveform_freq,
                                         self.waveform_ampl,
                                         self.waveform_offset)
-            self.define_component("src", self.src)
 
         elif type == gr.GR_UNIFORM or type == gr.GR_GAUSSIAN:
             self.src = gr.noise_source_c (gr.GR_UNIFORM,
                                           self.waveform_ampl)
-            self.define_component("src", self.src)
-        
+
         else:
             raise ValueError, type
 
-        # self.file_sink = gr.file_sink (gr.sizeof_gr_complex, "siggen.dat")
-        # self.define_component("file_sink", self.file_sink)
-
-        self.connect ("src", 0, "usrp", 0)
+        self.connect (self.src, self.u)
 
 
     def usb_freq (self):
-- 
cgit