1 files changed, 70 insertions, 0 deletions
diff --git a/gr-uhd/apps/hf_radio/ssbagc.py b/gr-uhd/apps/hf_radio/ssbagc.py
new file mode 100644
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+++ b/gr-uhd/apps/hf_radio/ssbagc.py
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+# Copyright 2011 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.
+ 
+
+# post detection agc processing
+#
+# This agc strategy is copied more or less verbatim from
+# weaver_isb_am1_usrp3.py by cswiger.
+#
+# Thanks.
+#
+# Then modified in a variety of ways.
+#
+# There doesn't appear to be a way to hook multiple blocks to the
+# input port when building a hier block like this. Thus the
+# split below.
+#
+# Basic operation.
+# Power is estimated by squaring the input.
+# Low pass filter using a 1 pole iir.
+# The time constant can be tweaked by changing the taps.
+# Currently there is no implementation to change this while operating
+#   a potentially useful addition.
+# The log block turns this into dB
+# gain adjusts the agc authority.
+#
+# M. Revnell 2006-Jan
+
+from gnuradio import gr
+
+class agc( gr.hier_block2 ):
+    def __init__( self ):
+        gr.hier_block2.__init__(self, "agc",
+                                gr.io_signature(1,1,gr.sizeof_float),
+                                gr.io_signature(1,1,gr.sizeof_float))
+
+        self.split = gr.multiply_const_ff( 1 )
+        self.sqr   = gr.multiply_ff( )
+        self.int0  = gr.iir_filter_ffd( [.004, 0], [0, .999] )
+        self.offs  = gr.add_const_ff( -30 )
+        self.gain  = gr.multiply_const_ff( 70 )
+        self.log   = gr.nlog10_ff( 10, 1 )
+        self.agc   = gr.divide_ff( )
+
+        self.connect(self,       self.split)
+        self.connect(self.split, (self.agc, 0))
+        self.connect(self.split, (self.sqr, 0))
+        self.connect(self.split, (self.sqr, 1))
+        self.connect(self.sqr,    self.int0)
+        self.connect(self.int0,   self.log)
+        self.connect(self.log,    self.offs)
+        self.connect(self.offs,   self.gain)
+        self.connect(self.gain,  (self.agc, 1))
+        self.connect(self.agc,    self)