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## Copyright (C) 2007 Muthiah Annamalai <muthiah.annamalai@uta.edu>
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## This program is free software; you can redistribute it and/or modify
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## it under the terms of the GNU General Public License as published by
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## the Free Software Foundation; either version 2 of the License, or
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## (at your option) any later version.
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## This program is distributed in the hope that it will be useful,
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## but WITHOUT ANY WARRANTY; without even the implied warranty of
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## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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## GNU General Public License for more details.
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## You should have received a copy of the GNU General Public License
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## along with this program; If not, see <http://www.gnu.org/licenses/>.
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## Copyright (C) 2007 Muthiah Annamalai <muthiah.annamalai@uta.edu>
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## This program is free software; you can redistribute it and/or modify it under
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## the terms of the GNU General Public License as published by the Free Software
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## Foundation; either version 3 of the License, or (at your option) any later
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## This program is distributed in the hope that it will be useful, but WITHOUT
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## ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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## FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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## You should have received a copy of the GNU General Public License along with
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## this program; if not, see <http://www.gnu.org/licenses/>.
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## @deftypefn {Function File} {[@var{w}] =} blackmannuttall(@var{L})
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## Compute the Blackman-Nuttall window.
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## Compute the Blackman-Nuttall window.
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## @seealso{nuttallwin, kaiser}
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function [w] = blackmannuttall(L)
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if (nargin < 1); usage('blackmannuttall(L)'); end
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error("L must be a number");
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w = a0 - a1.*cos(2.*pi.*n./N) + a2.*cos(4.*pi.*n./N) - a3.*cos(6.*pi.*n./N);
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elseif (! isscalar(L))
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error("L must be a number");
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w = a0 - a1.*cos(2.*pi.*n./N) + a2.*cos(4.*pi.*n./N) - a3.*cos(6.*pi.*n./N);