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## Copyright (C) 2007 Muthiah Annamalai <muthiah.annamalai@uta.edu>
##
## 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}] =} blackmannuttall (@var{m})
## Compute the Blackman-Nuttall window.
## @seealso{nuttallwin, kaiser}
## @end deftypefn
function [w] = blackmannuttall(m)
if (nargin < 1)
print_usage;
elseif (! isscalar(m))
error("M must be a number");
endif
if (m == 1)
w = 1;
else
N = m - 1;
a0 = 0.3635819;
a1 = 0.4891775;
a2 = 0.1365995;
a3 = 0.0106411;
n = 0:N;
w = a0 - a1.*cos(2.*pi.*n./N) + a2.*cos(4.*pi.*n./N) - a3.*cos(6.*pi.*n./N);
w = w.';
endif
endfunction

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