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diff --git a/gr-digital/python/modulation_utils.py b/gr-digital/python/modulation_utils.py
new file mode 100644
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+++ b/gr-digital/python/modulation_utils.py
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+#
+# Copyright 2010 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 this program; if not, write to the Free Software Foundation, Inc.,
+# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+#
+
+"""
+Miscellaneous utilities for managing mods and demods, as well as other items
+useful in dealing with generalized handling of different modulations and demods.
+"""
+
+import inspect
+
+
+# Type 1 modulators accept a stream of bytes on their input and produce complex baseband output
+_type_1_modulators = {}
+
+def type_1_mods():
+    return _type_1_modulators
+
+def add_type_1_mod(name, mod_class):
+    _type_1_modulators[name] = mod_class
+
+
+# Type 1 demodulators accept complex baseband input and produce a stream of bits, packed
+# 1 bit / byte as their output.  Their output is completely unambiguous.  There is no need
+# to resolve phase or polarity ambiguities.
+_type_1_demodulators = {}
+
+def type_1_demods():
+    return _type_1_demodulators
+
+def add_type_1_demod(name, demod_class):
+    _type_1_demodulators[name] = demod_class
+
+# Also record the constellation making functions of the modulations
+_type_1_constellations = {}
+
+def type_1_constellations():
+    return _type_1_constellations
+
+def add_type_1_constellation(name, constellation):
+    _type_1_constellations[name] = constellation
+
+
+def extract_kwargs_from_options(function, excluded_args, options):
+    """
+    Given a function, a list of excluded arguments and the result of
+    parsing command line options, create a dictionary of key word
+    arguments suitable for passing to the function.  The dictionary
+    will be populated with key/value pairs where the keys are those
+    that are common to the function's argument list (minus the
+    excluded_args) and the attributes in options.  The values are the
+    corresponding values from options unless that value is None.
+    In that case, the corresponding dictionary entry is not populated.
+
+    (This allows different modulations that have the same parameter
+    names, but different default values to coexist.  The downside is
+    that --help in the option parser will list the default as None,
+    but in that case the default provided in the __init__ argument
+    list will be used since there is no kwargs entry.)
+
+    @param function: the function whose parameter list will be examined
+    @param excluded_args: function arguments that are NOT to be added to the dictionary
+    @type excluded_args: sequence of strings
+    @param options: result of command argument parsing
+    @type options: optparse.Values
+    """
+    
+    # Try this in C++ ;)
+    args, varargs, varkw, defaults = inspect.getargspec(function)
+    d = {}
+    for kw in [a for a in args if a not in excluded_args]:
+        if hasattr(options, kw):
+            if getattr(options, kw) is not None:
+                d[kw] = getattr(options, kw)
+    return d
+
+def extract_kwargs_from_options_for_class(cls, options):
+    """
+    Given command line options, create dictionary suitable for passing to __init__
+    """
+    d = extract_kwargs_from_options(
+        cls.__init__, ('self',), options)
+    for base in cls.__bases__:
+        if hasattr(base, 'extract_kwargs_from_options'):
+            d.update(base.extract_kwargs_from_options(options))
+    return d