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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{y} =} gauspuls (@var{t},@var{fc},@var{bw})
## Return the Gaussian modulated sinusoidal pulse.
## @end deftypefn
function y = gauspuls(t, fc = 1e3, bw = 0.5)
if nargin<1, print_usage; endif
if fc < 0 , error("fc must be positive"); endif
if bw <= 0, error("bw must be stricltly positive"); endif
fv = -(bw.^2.*fc.^2)/(8.*log(10.^(-6/20)));
tv = 1/(4.*pi.^2.*fv);
y = exp(-t.*t/(2.*tv)).*cos(2.*pi.*fc.*t);
endfunction