1 files changed, 56 insertions, 0 deletions
diff --git a/gr-digital/include/digital_diff_decoder_bb.h b/gr-digital/include/digital_diff_decoder_bb.h
new file mode 100644
index 000000000..928035d0e
--- /dev/null
+++ b/gr-digital/include/digital_diff_decoder_bb.h
@@ -0,0 +1,56 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2006,2012 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_GR_DIFF_DECODER_BB_H
+#define INCLUDED_GR_DIFF_DECODER_BB_H
+
+#include <digital_api.h>
+#include <gr_sync_block.h>
+
+class digital_diff_decoder_bb;
+typedef boost::shared_ptr<digital_diff_decoder_bb> digital_diff_decoder_bb_sptr;
+
+DIGITAL_API digital_diff_decoder_bb_sptr
+digital_make_diff_decoder_bb(unsigned int modulus);
+
+/*!
+ * \brief y[0] = (x[0] - x[-1]) % M
+ * \ingroup coding_blk
+ *
+ * Uses current and previous symbols and the alphabet modulus to
+ * perform differential decoding.
+ */
+class DIGITAL_API digital_diff_decoder_bb : public gr_sync_block
+{
+  friend DIGITAL_API digital_diff_decoder_bb_sptr
+    digital_make_diff_decoder_bb(unsigned int modulus);
+  digital_diff_decoder_bb(unsigned int modulus);
+
+  unsigned int d_modulus;
+
+ public:
+  int work(int noutput_items,
+	   gr_vector_const_void_star &input_items,
+	   gr_vector_void_star &output_items);
+};
+
+#endif