4 files changed, 190 insertions, 0 deletions
diff --git a/gr-blocks/include/blocks/CMakeLists.txt b/gr-blocks/include/blocks/CMakeLists.txt
index cd2fea672..8d5fe9b13 100644
--- a/gr-blocks/include/blocks/CMakeLists.txt
+++ b/gr-blocks/include/blocks/CMakeLists.txt
@@ -138,6 +138,9 @@ install(FILES
     stream_to_vector.h
     streams_to_stream.h
     streams_to_vector.h
+    stretch_ff.h
+    threshold_ff.h
+    throttle.h
     uchar_to_float.h
     vector_to_stream.h
     vector_to_streams.h
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 */
diff --git a/gr-blocks/include/blocks/threshold_ff.h b/gr-blocks/include/blocks/threshold_ff.h
new file mode 100644
index 000000000..900e5c5bd
--- /dev/null
+++ b/gr-blocks/include/blocks/threshold_ff.h
@@ -0,0 +1,66 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2004,2013 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_THRESHOLD_FF_H
+#define INCLUDED_GR_THRESHOLD_FF_H
+
+#include <blocks/api.h>
+#include <gr_sync_block.h>
+
+namespace gr {
+  namespace blocks {
+
+    /*!
+     * \brief Output a 1 or zero based on a threshold value.
+     * \ingroup misc_blk
+     *
+     * Test the incoming signal against a threshold. If the signal
+     * excedes the \p hi value, it will output a 1 until the signal
+     * falls below the \p lo value.
+     */
+    class BLOCKS_API threshold_ff : virtual public gr_sync_block
+    {
+    public:
+      // gr::blocks::threshold_ff::sptr
+      typedef boost::shared_ptr<threshold_ff> sptr;
+
+      /* \brief Create a threadshold block.
+       * \param lo Threshold input signal needs to drop below to
+       *           change state to 0.
+       * \param hi Threshold input signal needs to rise above to
+       *           change state to 1.
+       * \param initial_state Initial state of the block (0 or 1).
+       */
+      static sptr make(float lo, float hi, float initial_state=0);
+
+      virtual float lo () const = 0;
+      virtual void set_lo (float lo) = 0;
+      virtual float hi () const = 0;
+      virtual void set_hi (float hi) = 0;
+      virtual float last_state () const = 0;
+      virtual void set_last_state (float last_state) = 0;
+    };
+
+  } /* namespace blocks */
+} /* namespace gr */
+
+#endif /* INCLUDED_GR_THRESHOLD_FF_H */
diff --git a/gr-blocks/include/blocks/throttle.h b/gr-blocks/include/blocks/throttle.h
new file mode 100644
index 000000000..20d8037e1
--- /dev/null
+++ b/gr-blocks/include/blocks/throttle.h
@@ -0,0 +1,62 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2005-2011,2013 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_THROTTLE_H
+#define INCLUDED_GR_THROTTLE_H
+
+#include <blocks/api.h>
+#include <gr_sync_block.h>
+
+namespace gr {
+  namespace blocks {
+
+    /*!
+     * \brief throttle flow of samples such that the average rate does
+     * not exceed samples_per_sec.
+     * \ingroup misc_blk
+     *
+     * input: one stream of itemsize; output: one stream of itemsize
+     *
+     * N.B. this should only be used in GUI apps where there is no
+     * other rate limiting block. It is not intended nor effective at
+     * precisely controlling the rate of samples. That should be
+     * controlled by a source or sink tied to sample clock. E.g., a
+     * USRP or audio card.
+     */
+    class BLOCKS_API throttle : virtual public gr_sync_block
+    {
+    public:
+      typedef boost::shared_ptr<throttle> sptr;
+
+      static sptr make(size_t itemsize, double samples_per_sec);
+
+      //! Sets the sample rate in samples per second.
+      virtual void set_sample_rate(double rate) = 0;
+
+      //! Get the sample rate in samples per second.
+      virtual double sample_rate() const = 0;
+    };
+
+  } /* namespace blocks */
+} /* namespace gr */
+
+#endif /* INCLUDED_GR_THROTTLE_H */