1 files changed, 75 insertions, 0 deletions
diff --git a/gr-analog/include/analog/pwr_squelch_ff.h b/gr-analog/include/analog/pwr_squelch_ff.h
new file mode 100644
index 000000000..6fdebec74
--- /dev/null
+++ b/gr-analog/include/analog/pwr_squelch_ff.h
@@ -0,0 +1,75 @@
+/* -*- 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_ANALOG_PWR_SQUELCH_FF_H
+#define INCLUDED_ANALOG_PWR_SQUELCH_FF_H
+
+#include <analog/api.h>
+#include <analog/squelch_base_ff.h>
+#include <cmath>
+
+namespace gr {
+  namespace analog {
+    
+    /*!
+     * \brief gate or zero output when input power below threshold
+     * \ingroup level_blk
+     */
+    class ANALOG_API pwr_squelch_ff :
+      public squelch_base_ff, virtual public gr_block
+    {
+    protected:
+      virtual void update_state(const float &in) = 0;
+      virtual bool mute() const = 0;
+
+    public:
+      // gr::analog::pwr_squelch_ff::sptr
+      typedef boost::shared_ptr<pwr_squelch_ff> sptr;
+      
+      /*!
+       * \brief Make power-based squelch block.
+       *
+       * \param db threshold (in dB) for power squelch
+       * \param alpha Gain of averaging filter
+       * \param ramp
+       * \param gate 
+       */
+      static sptr make(double db, double alpha=0.0001,
+		       int ramp=0, bool gate=false);
+
+      virtual std::vector<float> squelch_range() const = 0;
+
+      virtual double threshold() const = 0;
+      virtual void set_threshold(double db) = 0;
+      virtual void set_alpha(double alpha) = 0;
+
+      virtual int ramp() const = 0;
+      virtual void set_ramp(int ramp) = 0;
+      virtual bool gate() const = 0;
+      virtual void set_gate(bool gate) = 0;
+      virtual bool unmuted() const = 0;
+    };
+
+  } /* namespace analog */
+} /* namespace gr */
+
+#endif /* INCLUDED_ANALOG_PWR_SQUELCH_FF_H */