Mercurial > octave-nkf
view scripts/signal/hamming.m @ 5301:9302581b820d ss-2-9-2
[project @ 2005-04-22 17:08:07 by jwe]
author | jwe |
---|---|
date | Fri, 22 Apr 2005 17:09:11 +0000 |
parents | 22bd65326ec1 |
children | 4c8a2e4e0717 |
line wrap: on
line source
## Copyright (C) 1995, 1996, 1997 Andreas Weingessel ## ## This file is part of Octave. ## ## Octave 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 2, or (at your option) ## any later version. ## ## Octave 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 Octave; see the file COPYING. If not, write to the Free ## Software Foundation, 59 Temple Place - Suite 330, Boston, MA ## 02111-1307, USA. ## -*- texinfo -*- ## @deftypefn {Function File} {} hamming (@var{m}) ## Return the filter coefficients of a Hamming window of length @var{m}. ## ## For a definition of the Hamming window, see e.g. A. V. Oppenheim & ## R. W. Schafer, "Discrete-Time Signal Processing". ## @end deftypefn ## Author: AW <Andreas.Weingessel@ci.tuwien.ac.at> ## Description: Coefficients of the Hamming window function c = hamming (m) if (nargin != 1) usage ("hamming (m)"); endif if (! (isscalar (m) && (m == round (m)) && (m > 0))) error ("hamming: m has to be an integer > 0"); endif if (m == 1) c = 1; else m = m - 1; c = 0.54 - 0.46 * cos (2 * pi * (0:m)' / m); endif endfunction