Merge branch 'upstream' into dfsg-orig

[debian/gnuradio] / gr-atsc / src / lib / fpll_btloop_coupling.h

diff --git a/gr-atsc/src/lib/fpll_btloop_coupling.h b/gr-atsc/src/lib/fpll_btloop_coupling.h
new file mode 100644 (file)
index 0000000..e17425d
--- /dev/null
+++ b/gr-atsc/src/lib/fpll_btloop_coupling.h
@@ -0,0 +1,38 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2002 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 _FPLL_BTLOOP_COUPLING_H_
+#define _FPLL_BTLOOP_COUPLING_H_
+
+/*!
+ * Magic coupling constant between GrAtscFPLL and GrAtscBitTimingLoop.
+ * Trust me, you don't want to mess with this.
+ *
+ * The agc block buried in the FPLL indirectly sets the level of the input
+ * to the bit timing loop.  The bit timing loop's convergence properties
+ * depend on the the mean amplitude of it's input.  This constant ties
+ * them together such that you can tweak the input level of the bit timing loop
+ * (somewhat) without screwing everything.
+ */
+
+static const float FPLL_BTLOOP_COUPLING_CONST = 3.125;
+
+#endif /* _FPLL_BTLOOP_COUPLING_H_ */