1 files changed, 64 insertions, 0 deletions
diff --git a/gr-pager/python/flex_demod.py b/gr-pager/python/flex_demod.py
new file mode 100644
index 000000000..b79c1adaa
--- /dev/null
+++ b/gr-pager/python/flex_demod.py
@@ -0,0 +1,64 @@
+#
+# Copyright 2006,2007 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.
+# 
+
+from gnuradio import gr, gru, optfir, blks2
+from math import pi
+import pager_swig
+
+class flex_demod(gr.hier_block2):
+    """
+    FLEX pager protocol demodulation block.
+
+    This block demodulates a band-limited, complex down-converted baseband 
+    channel into FLEX protocol frames.
+
+    """
+
+    def __init__(self, queue, freq=0.0, verbose=False, log=False):
+	gr.hier_block2.__init__(self, "flex_demod",
+				gr.io_signature(1, 1, gr.sizeof_gr_complex),
+				gr.io_signature(0,0,0))
+
+        k = 25000/(2*pi*1600)        # 4800 Hz max deviation
+        quad = gr.quadrature_demod_cf(k)
+	self.connect(self, quad)
+	
+        rsamp = blks2.rational_resampler_fff(16, 25)
+        self.slicer = pager_swig.slicer_fb(5e-6) # DC removal averaging filter constant
+	self.sync = pager_swig.flex_sync()
+
+        self.connect(quad, rsamp, self.slicer, self.sync)
+
+	for i in range(4):
+	    self.connect((self.sync, i), pager_swig.flex_deinterleave(), pager_swig.flex_parse(queue, freq))
+
+	if log:
+	    suffix = '_'+ "%3.3f" % (freq/1e6,) + '.dat'
+	    quad_sink = gr.file_sink(gr.sizeof_float, 'quad'+suffix)
+	    rsamp_sink = gr.file_sink(gr.sizeof_float, 'rsamp'+suffix)
+	    slicer_sink = gr.file_sink(gr.sizeof_char, 'slicer'+suffix)
+	    self.connect(rsamp, rsamp_sink)
+	    self.connect(quad, quad_sink)
+	    self.connect(self.slicer, slicer_sink)
+
+    def dc_offset(self):
+	return self.slicer.dc_offset()
+		    
+\ No newline at end of file