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diff --git a/gr-channels/lib/sro_model_impl.h b/gr-channels/lib/sro_model_impl.h
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+++ b/gr-channels/lib/sro_model_impl.h
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+/* -*- c++ -*- */
+/*
+ * Copyright 2004,2007,2012 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.
+ */
+
+#ifndef INCLUDED_CHANNELS_SRO_MODEL_CC_IMPL_H
+#define	INCLUDED_CHANNELS_SRO_MODEL_CC_IMPL_H
+
+#include <gnuradio/filter/fractional_interpolator_cc.h>
+#include <gnuradio/filter/mmse_fir_interpolator_cc.h>
+#include <gnuradio/analog/fastnoise_source_f.h>
+#include <gnuradio/channels/sro_model.h>
+
+namespace gr {
+  namespace channels {
+    
+    class CHANNELS_API sro_model_impl
+      : public sro_model
+    {
+    private:
+      float d_mu;
+      float d_mu_inc;
+      float d_sro;
+      float d_samp_rate;
+      float d_max_dev_hz;
+      gr::filter::mmse_fir_interpolator_cc *d_interp;
+      gr::analog::fastnoise_source_f::sptr d_noise;
+
+    public:
+      sro_model_impl(
+                double sample_rate_hz,
+                double std_dev_hz,
+                double max_dev_hz,
+                double noise_seed=0);
+      ~sro_model_impl();
+
+      void forecast(int noutput_items,
+		    gr_vector_int &ninput_items_required);
+      int general_work(int noutput_items,
+		       gr_vector_int &ninput_items,
+		       gr_vector_const_void_star &input_items,
+		       gr_vector_void_star &output_items);
+
+      float mu() const;
+      float interp_ratio() const;
+      void set_mu(float mu);
+      void set_interp_ratio(float interp_ratio);
+      void setup_rpc();
+
+    };
+
+  } /* namespace filter */
+} /* namespace gr */
+
+#endif