Add a useful package (from Source forge) for octave

[CreaPhase.git] / octave_packages / communications-1.1.1 / fmdemod.m

diff --git a/octave_packages/communications-1.1.1/fmdemod.m b/octave_packages/communications-1.1.1/fmdemod.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} fmdemod (@var{x},@var{fc},@var{fs})
+## Create the FM demodulation of the signal x with carrier frequency fs. Where x is sample at frequency fs.
+## @seealso{ammod,amdemod,fmmod}
+## @end deftypefn
+
+
+function m = fmdemod(s,fc,fs)
+        if (nargin != 3)
+               usage ("fmdemod(x,fs,fc)");
+       endif
+       
+       ds = diff(s);
+       m = amdemod(abs(ds),fc,fs);