Add a useful package (from Source forge) for octave

[CreaPhase.git] / octave_packages / signal-1.1.3 / gauspuls.m

diff --git a/octave_packages/signal-1.1.3/gauspuls.m b/octave_packages/signal-1.1.3/gauspuls.m
new file mode 100644 (file)
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+++ b/octave_packages/signal-1.1.3/gauspuls.m
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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; end
+  if fc < 0 , error("fc must be positive"); end
+  if bw <= 0, error("bw must be stricltly positive"); end
+
+  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