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diff --git a/gr-digital/lib/cpmmod_bc_impl.cc b/gr-digital/lib/cpmmod_bc_impl.cc
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+++ b/gr-digital/lib/cpmmod_bc_impl.cc
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+/* -*- c++ -*- */
+/*
+ * Copyright 2010,2012 Free Software Foundation, Inc.
+ * 
+ * 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.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include "cpmmod_bc_impl.h"
+#include <gr_io_signature.h>
+
+namespace gr {
+  namespace digital {
+
+    cpmmod_bc::sptr
+    cpmmod_bc::make(gr_cpm::cpm_type type, float h,
+		    int samples_per_sym,
+		    int L, double beta)
+    {
+      return gnuradio::get_initial_sptr
+	(new cpmmod_bc_impl("cpmmod_bc",
+			    (gr_cpm::cpm_type)type,
+			    h, samples_per_sym,
+			    L, beta));
+    }
+
+    cpmmod_bc::sptr
+    cpmmod_bc::make_gmskmod_bc(int samples_per_sym,
+			       int L, double beta)
+    {
+      return gnuradio::get_initial_sptr
+	(new cpmmod_bc_impl("gmskmod_bc",
+			    gr_cpm::GAUSSIAN, 0.5,
+			    samples_per_sym,
+			    L, beta));
+    }
+
+    cpmmod_bc_impl::cpmmod_bc_impl(const std::string &name,
+				   gr_cpm::cpm_type type, float h,
+				   int samples_per_sym,
+				   int L, double beta)
+      : gr_hier_block2(name,
+		       gr_make_io_signature(1, 1, sizeof(char)),
+		       gr_make_io_signature2(1, 1, sizeof(gr_complex), sizeof(float))),
+	d_type(type), d_index(h), d_sps(samples_per_sym), d_length(L), d_beta(beta),
+	d_taps(gr_cpm::phase_response(type, samples_per_sym, L, beta)),
+	d_char_to_float(gr_make_char_to_float()),
+	d_pulse_shaper(gr::filter::interp_fir_filter_fff::make(samples_per_sym, d_taps)),
+	d_fm(gr_make_frequency_modulator_fc(M_PI * h))
+    {
+      switch(type) {
+      case gr_cpm::LRC:
+      case gr_cpm::LSRC:
+      case gr_cpm::LREC:
+      case gr_cpm::TFM:
+      case gr_cpm::GAUSSIAN:
+	break;
+    
+      default:
+	throw std::invalid_argument("cpmmod_bc_impl: invalid CPM type");
+      }
+  
+      connect(self(), 0, d_char_to_float, 0);
+      connect(d_char_to_float, 0, d_pulse_shaper, 0);
+      connect(d_pulse_shaper, 0, d_fm, 0);
+      connect(d_fm, 0, self(), 0);
+    }
+
+    cpmmod_bc_impl::~cpmmod_bc_impl()
+    {
+    }
+
+    std::vector<float>
+    cpmmod_bc_impl::taps() const
+    {
+      return d_taps;
+    }
+
+    int
+    cpmmod_bc_impl::type() const
+    {
+      return d_type;
+    }
+
+    float
+    cpmmod_bc_impl::index() const
+    {
+      return d_index;
+    }
+
+    int
+    cpmmod_bc_impl::samples_per_sym() const
+    {
+      return d_sps;
+    }
+
+    int
+    cpmmod_bc_impl::length() const
+    {
+      return d_length;
+    }
+
+    double cpmmod_bc_impl::beta() const
+    {
+      return d_beta;
+    }
+
+  } /* namespace digital */
+} /* namespace gr */