blocks: adding threshold, strech, and throttle to gr-blocks.

1 files changed, 66 insertions, 0 deletions

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 */