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diff --git a/gr-digital/python/digital/bpsk.py b/gr-digital/python/digital/bpsk.py
new file mode 100644
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+++ b/gr-digital/python/digital/bpsk.py
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+#
+# Copyright 2005,2006,2011 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.
+# 
+
+"""
+BPSK modulation and demodulation.
+"""
+
+from math import pi, log
+from cmath import exp
+
+from gnuradio import gr
+from gnuradio.digital.generic_mod_demod import generic_mod, generic_demod
+from gnuradio.digital.generic_mod_demod import shared_mod_args, shared_demod_args
+import digital_swig
+import modulation_utils
+
+# /////////////////////////////////////////////////////////////////////////////
+#                           BPSK constellation
+# /////////////////////////////////////////////////////////////////////////////
+
+def bpsk_constellation():
+    return digital_swig.constellation_bpsk()
+
+# /////////////////////////////////////////////////////////////////////////////
+#                           BPSK modulator
+# /////////////////////////////////////////////////////////////////////////////
+
+class bpsk_mod(generic_mod):
+    """
+    Hierarchical block for RRC-filtered BPSK modulation.
+    
+    The input is a byte stream (unsigned char) and the
+    output is the complex modulated signal at baseband.
+    
+    
+    Args: 
+        mod_code: Argument is not used.  It exists purely to simplify generation of the block in grc.
+        differential: Whether to use differential encoding (boolean).
+    """
+    # See generic_mod for additional arguments
+    __doc__ += shared_mod_args
+
+    def __init__(self, mod_code=None, differential=False, *args, **kwargs):
+
+        constellation = digital_swig.constellation_bpsk()
+        super(bpsk_mod, self).__init__(constellation=constellation,
+                                       differential=differential, *args, **kwargs)
+
+
+# /////////////////////////////////////////////////////////////////////////////
+#                           BPSK demodulator
+#
+# /////////////////////////////////////////////////////////////////////////////
+
+class bpsk_demod(generic_demod):
+    """
+    Hierarchical block for RRC-filtered BPSK modulation.
+    
+    The input is a byte stream (unsigned char) and the
+    output is the complex modulated signal at baseband.
+
+    Args: 
+        mod_code: Argument is not used.  It exists purely to simplify generation of the block in grc.
+        differential: whether to use differential encoding (boolean)                  
+    """
+    # See generic_demod for additional arguments
+    __doc__ += shared_demod_args
+
+    def __init__(self, mod_code=None, differential=False, *args, **kwargs):
+        constellation = digital_swig.constellation_bpsk()
+        super(bpsk_demod, self).__init__(constellation=constellation,
+                                         differential=differential, *args, **kwargs)
+#bpsk_demod.__doc__ += shared_demod_args
+
+
+# /////////////////////////////////////////////////////////////////////////////
+#                           DBPSK constellation
+# /////////////////////////////////////////////////////////////////////////////
+
+def dbpsk_constellation():
+    return digital_swig.constellation_dbpsk()
+
+# /////////////////////////////////////////////////////////////////////////////
+#                           DBPSK modulator
+# /////////////////////////////////////////////////////////////////////////////
+
+class dbpsk_mod(bpsk_mod):
+    """
+    Hierarchical block for RRC-filtered DBPSK modulation.
+    
+    The input is a byte stream (unsigned char) and the
+    output is the complex modulated signal at baseband.
+    
+    Args: 
+        mod_code: Argument is not used.  It exists purely to simplify generation of the block in grc.
+    """
+    # See generic_mod for additional arguments
+    __doc__ += shared_mod_args
+
+    def __init__(self, mod_code=None, *args, **kwargs):
+
+        super(dbpsk_mod, self).__init__(*args, **kwargs)
+
+# /////////////////////////////////////////////////////////////////////////////
+#                           DBPSK demodulator
+#
+# /////////////////////////////////////////////////////////////////////////////
+
+class dbpsk_demod(bpsk_demod):
+    """
+    Hierarchical block for RRC-filtered DBPSK modulation.
+    
+    The input is a byte stream (unsigned char) and the
+    output is the complex modulated signal at baseband.
+    
+    Args: 
+        mod_code: Argument is not used.  It exists purely to simplify generation of the block in grc.
+    """
+    # See generic_demod for additional arguments
+    __doc__ += shared_demod_args
+
+    def __init__(self, mod_code=None, *args, **kwargs):
+
+        super(dbpsk_demod, self).__init__(*args, **kwargs)
+
+#
+# Add these to the mod/demod registry
+#
+modulation_utils.add_type_1_mod('bpsk', bpsk_mod)
+modulation_utils.add_type_1_demod('bpsk', bpsk_demod)
+modulation_utils.add_type_1_constellation('bpsk', bpsk_constellation)
+modulation_utils.add_type_1_mod('dbpsk', dbpsk_mod)
+modulation_utils.add_type_1_demod('dbpsk', dbpsk_demod)
+modulation_utils.add_type_1_constellation('dbpsk', dbpsk_constellation)