X-Git-Url: https://git.creatis.insa-lyon.fr/pubgit/?p=CreaPhase.git;a=blobdiff_plain;f=octave_packages%2Fsignal-1.1.3%2Fblackmannuttall.m;fp=octave_packages%2Fsignal-1.1.3%2Fblackmannuttall.m;h=e3e588e64228ac56e6bafce9e4bdea5e5e4ae9d8;hp=0000000000000000000000000000000000000000;hb=c880e8788dfc484bf23ce13fa2787f2c6bca4863;hpb=1705066eceaaea976f010f669ce8e972f3734b05

diff --git a/octave_packages/signal-1.1.3/blackmannuttall.m b/octave_packages/signal-1.1.3/blackmannuttall.m
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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{L})
+## Compute the Blackman-Nuttall window.
+## @seealso{nuttallwin,  kaiser}
+## @end deftypefn
+
+function [w] = blackmannuttall(L)
+  if (nargin < 1)
+    print_usage;
+  elseif (! isscalar(L))
+    error("L must be a number");
+  endif
+
+  N = L-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.';
+endfunction