## 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
