[d4a496]: / inst / parzenwin.m  Maximize  Restore  History

Download this file

46 lines (38 with data), 1.3 kB

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
## 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}] =} parzenwin (@var{m})
## Compute the Parzen window of length @var{m}.
## @seealso{rectwin, bartlett}
## @end deftypefn
function w = parzenwin (m)
if(nargin != 1)
print_usage;
elseif(m < 0)
error('M must be positive');
endif
if(m ~= floor(m))
m = round(m);
endif
N = m - 1;
n = -(N/2):N/2;
n1 = n(find(abs(n) <= N/4));
n2 = n(find(n > N/4));
n3 = n(find(n < -N/4));
w1 = 1 -6.*(abs(n1)./(m/2)).^2 + 6*(abs(n1)./(m/2)).^3;
w2 = 2.*(1-abs(n2)./(m/2)).^3;
w3 = 2.*(1-abs(n3)./(m/2)).^3;
w = [w3 w1 w2]';
endfunction