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diff --git a/octave_packages/m/signal/private/triangle_sw.m b/octave_packages/m/signal/private/triangle_sw.m
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+## Copyright (C) 1995-2012 Friedrich Leisch
+##
+## This file is part of Octave.
+##
+## Octave 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.
+##
+## Octave 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 Octave; see the file COPYING.  If not, see
+## <http://www.gnu.org/licenses/>.
+
+## -*- texinfo -*-
+## @deftypefn {Function File} {} triangle_sw (@var{n}, @var{b})
+## Triangular spectral window.  Subfunction used for spectral density
+## estimation.
+## @end deftypefn
+
+## Author: FL <Friedrich.Leisch@ci.tuwien.ac.at>
+## Description: Triangular spectral window
+
+function retval = triangle_sw (n, b)
+
+  if (nargin != 2)
+    print_usage ();
+  endif
+
+  retval = zeros(n,1);
+  retval(1) = 1 / b;
+
+  l = (2:n)' - 1;
+  l = 2 * pi * l / n;
+
+  retval(2:n) = b * (sin (l / (2*b)) ./ sin (l / 2)).^2;
+
+endfunction
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