1 files changed, 85 insertions, 0 deletions
diff --git a/gr-analog/lib/agc3_cc_impl.cc b/gr-analog/lib/agc3_cc_impl.cc
new file mode 100644
index 0000000000..c99434d8a8
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+++ b/gr-analog/lib/agc3_cc_impl.cc
@@ -0,0 +1,85 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2006,2010,2012 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.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include "agc3_cc_impl.h"
+#include <gr_io_signature.h>
+
+namespace gr {
+  namespace analog {
+
+    agc3_cc::sptr
+    agc3_cc::make(float attack_rate, float decay_rate, float reference)
+    {
+      return gnuradio::get_initial_sptr (new agc3_cc_impl(attack_rate, decay_rate, reference));
+    }
+
+    agc3_cc_impl::agc3_cc_impl(float attack_rate, float decay_rate, float reference)
+      : gr_sync_block("agc3_cc",
+		      gr_make_io_signature(1, 1, sizeof(gr_complex)),
+		      gr_make_io_signature(1, 1, sizeof(gr_complex))),
+        d_attack(attack_rate), d_decay(decay_rate),
+        d_reference(reference), d_gain(1.0),
+        d_reset(true)
+    {
+    }
+
+    agc3_cc_impl::~agc3_cc_impl()
+    {
+    }
+
+    int
+    agc3_cc_impl::work(int noutput_items,
+		       gr_vector_const_void_star &input_items,
+		       gr_vector_void_star &output_items)
+    {
+      const gr_complex *in = (const gr_complex*)input_items[0];
+      gr_complex *out = (gr_complex*)output_items[0];
+      // Compute a linear average on reset (no expected)  
+      if(__builtin_expect (d_reset, false)){
+        float mag;
+        for(int i=0; i<noutput_items; i++){
+            mag += abs(in[i]);
+        }
+        d_gain = d_reference * (noutput_items/mag);
+        for(int i=0; i<noutput_items; i++){
+            out[i] = in[i] * d_gain;
+        }
+        d_reset = false;
+        printf("computed initial mean on %d values = %f\n", noutput_items, d_gain);
+      } else {
+        // Otherwise perform a normal iir update
+        for(int i=0; i<noutput_items; i++){
+          float newlevel = abs(in[i]);
+          float rate = (newlevel > d_reference/d_gain)?d_attack:d_decay;
+          d_gain = (d_gain*(1-rate)) + (d_reference/newlevel)*rate;
+          out[i] = in[i] * d_gain;
+        }
+      } 
+      return noutput_items;
+    }
+
+  } /* namespace analog */
+} /* namespace gr */