Add a useful package (from Source forge) for octave

[CreaPhase.git] / octave_packages / signal-1.1.3 / barthannwin.m

diff --git a/octave_packages/signal-1.1.3/barthannwin.m b/octave_packages/signal-1.1.3/barthannwin.m
new file mode 100644 (file)
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+++ b/octave_packages/signal-1.1.3/barthannwin.m
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+## Copyright (C) 2007 Sylvain Pelissier <sylvain.pelissier@gmail.com>
+##
+## 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 3 of the License, 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 program; if not, see <http://www.gnu.org/licenses/>.
+
+## -*- texinfo -*-
+## @deftypefn {Function File} {[@var{w}] =} barthannwin(@var{L})
+## Compute the modified Bartlett-Hann window of lenght L.
+## @seealso{rectwin,  bartlett}
+## @end deftypefn
+
+function [w] = barthannwin(L)
+  if (nargin < 1)
+    print_usage;
+  elseif (! isscalar(L) || L < 0)
+    error("L must be a positive integer");
+  endif
+  L = round(L);
+  N = L-1;
+  n = 0:N;
+
+  w = 0.62 -0.48.*abs(n./(L-1) - 0.5)+0.38*cos(2.*pi*(n./(L-1)-0.5));
+  w = w';
+endfunction