1 files changed, 59 insertions, 0 deletions
diff --git a/gr-blocks/include/blocks/stretch_ff.h b/gr-blocks/include/blocks/stretch_ff.h
new file mode 100644
index 000000000..5f98452a4
--- /dev/null
+++ b/gr-blocks/include/blocks/stretch_ff.h
@@ -0,0 +1,59 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2008,2013 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_STRETCH_FF_H
+#define INCLUDED_GR_STRETCH_FF_H
+
+#include <blocks/api.h>
+#include <gr_sync_block.h>
+
+namespace gr {
+  namespace blocks {
+    
+    /*!
+     * \brief adjust y-range of an input vector by mapping to range
+     * (max-of-input, stipulated-min). Primarily for spectral
+     * signature matching by normalizing spectrum dynamic ranges.
+     * \ingroup misc_blk
+     */
+    class BLOCKS_API stretch_ff : virtual public gr_sync_block
+    {
+    public:
+      // gr::blocks::stretch_ff::sptr
+      typedef boost::shared_ptr<stretch_ff> sptr;
+      
+      /*!
+       * \brief Make a stretch block.
+       * \param lo Set low value for range.
+       * \param vlen vector length of input stream.
+     */
+      static sptr make(float lo, size_t vlen=1);
+
+      virtual float lo() const = 0;
+      virtual void set_lo(float lo) = 0;
+      virtual size_t vlen() const = 0;
+    };
+
+  } /* namespace blocks */
+} /* namespace gr */
+
+#endif /* INCLUDED_GR_STRETCH_FF_H */