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diff --git a/gr-atsc/include/atsc/equalizer_lms2_impl.h b/gr-atsc/include/atsc/equalizer_lms2_impl.h
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+++ b/gr-atsc/include/atsc/equalizer_lms2_impl.h
@@ -0,0 +1,80 @@
+/* -*- 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 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 _ATSC_EQUALIZER_LMS2_H_
+#define _ATSC_EQUALIZER_LMS2_H_
+
+#include <atsc/api.h>
+#include <atsc/equalizer_impl.h>
+#include <vector>
+#include <stdio.h>
+
+class ATSC_API atsci_equalizer_lms2 : public atsci_equalizer
+{
+public:
+  atsci_equalizer_lms2 ();
+  virtual ~atsci_equalizer_lms2 ();
+
+  virtual void reset ();
+  virtual int ntaps () const;
+  virtual int npretaps () const;
+
+protected:
+  FILE *trainingfile;
+  virtual void filter_normal (const float *input_samples,
+			      float *output_samples,
+			      int   nsamples);
+
+  virtual void filter_data_seg_sync (const float *input_samples,
+				     float *output_samples,
+				     int   nsamples,
+				     int   offset);
+
+  virtual void filter_field_sync (const float *input_samples,
+				  float *output_samples,
+				  int   nsamples,
+				  int   offset,
+				  int	which_field);
+
+private:
+  std::vector<double>	d_taps_ff;
+  std::vector<double>	d_taps_fb;
+  std::vector<float>	d_old_output;
+
+  int d_output_ptr;
+
+  void filterN (const float *input_samples,
+		float *output_samples,
+		int nsamples);
+
+  void adaptN (const float *input_samples,
+	       const float *training_pattern,
+	       float *output_samples,
+	       int    nsamples);
+
+  float filter1 (const float input[]);
+  float adapt1 (const float input[], float ideal_output);
+
+};
+
+
+#endif /* _ATSC_EQUALIZER_LMS2_H_ */