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nuttallwin.m    49 lines (41 with data), 1.4 kB

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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}] =} nuttallwin (@var{m})
## Compute the Blackman-Harris window defined by Nuttall of length @var{m}.
## @seealso{blackman, blackmanharris}
## @end deftypefn
function [w] = nuttallwin(m)
if (nargin != 1); print_usage; endif
if(m < 0)
error('M must be positive');
endif
if(m ~= floor(m))
m = round(m);
warning('M rounded to the nearest integer.');
endif
if (m == 1)
w = 1;
else
N = m - 1;
a0 = 0.355768;
a1 = 0.487396;
a2 = 0.144232;
a3 = 0.012604;
n = -N/2:N/2;
w = a0 + a1.*cos(2.*pi.*n./N) + a2.*cos(4.*pi.*n./N) + a3.*cos(6.*pi.*n./N);
w = w';
endif
endfunction