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diff --git a/gr-atsc/src/lib/GrAtscSegSymSyncImpl.h b/gr-atsc/src/lib/GrAtscSegSymSyncImpl.h
new file mode 100644
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+++ b/gr-atsc/src/lib/GrAtscSegSymSyncImpl.h
@@ -0,0 +1,69 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2002 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 2, 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., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+#ifndef _GRATSCSEGSYMSYNCIMPL_H_
+#define _GRATSCSEGSYMSYNCIMPL_H_
+
+#include <GrAtscSegSymSync.h>
+#include <atsci_sssr.h>
+
+
+/*!
+ * \brief concrete implementation of GrAtscSegSymSync
+ *
+ * This class implements data segment sync tracking and symbol timing
+ * using a variation of the method described in
+ * "ATSC/VSB Tutorial - Receiver Technology" by Wayne E. Bretl of
+ * Zenith, pgs 41-45.
+ */
+
+class GrAtscSegSymSyncImpl : public GrAtscSegSymSync {
+
+  atsci_sssr		d_sssr;
+  atsci_interpolator	d_interp;
+  VrSampleIndex		d_next_input;
+  double		d_rx_clock_to_symbol_freq;	// nominal ratio
+
+public:
+
+  // the standard methods...
+  
+  GrAtscSegSymSyncImpl (double nominal_ratio_of_rx_clock_to_symbol_freq);
+  virtual ~GrAtscSegSymSyncImpl ();
+
+  virtual const char *name () { return "GrAtscSegSymSyncImpl"; }
+
+  virtual int forecast (VrSampleRange output,
+			VrSampleRange inputs[]);
+
+  virtual int work (VrSampleRange output, void *o[],
+		    VrSampleRange inputs[], void *i[]);
+
+  void pre_initialize ();
+  
+
+  // reset on channel change
+
+  virtual void reset ();
+
+};
+
+#endif /* _GRATSCSEGSYMSYNCIMPL_H_ */