## Copyright (C) 1995, 1996, 1997 Andreas Weingessel ## ## 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 2, 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 file. If not, write to the Free Software Foundation, ## 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. ## usage: hamming (m) ## ## Returns the filter coefficients of a Hamming window of length m. ## ## For a definition of the Hamming window, see e.g. A. V. Oppenheim & ## R. W. Schafer, "Discrete-Time Signal Processing". ## 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 !(is_scalar (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

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