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+## Copyright (C) 1995, 1996, 1997  Andreas Weingessel
+## 
+## This program 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 2, or (at your option)
+## any later version.
+## 
+## This program 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 this file.  If not, write to the Free Software Foundation,
+## 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+
+## usage:  hanning (m)
+##
+## Returns the filter coefficients of a Hanning window of length m.
+##
+## For a definition of this window type, see e.g. A. V. Oppenheim &
+## R. W. Schafer, "Discrete-Time Signal Processing".
+  
+## Author:  AW <Andreas.Weingessel@ci.tuwien.ac.at>
+## Description:  Coefficients of the Hanning window
+
+function c = hanning (m)
+  
+  if (nargin != 1)
+    usage ("hanning (m)");
+  endif
+  
+  if !(is_scalar (m) && (m == round (m)) && (m > 0))
+    error ("hanning:  m has to be an integer > 0");
+  endif
+  
+  if (m == 1)
+    c = 1;
+  else
+    m = m - 1;
+    c = 0.5 - 0.5 * cos (2 * pi * (0 : m)' / m);
+  endif
+  
+endfunction