--- /dev/null
+## Copyright (C) 1995-2012 Friedrich Leisch
+##
+## 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 3 of the License, 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, see
+## <http://www.gnu.org/licenses/>.
+
+## -*- texinfo -*-
+## @deftypefn {Function File} {} sinetone (@var{freq}, @var{rate}, @var{sec}, @var{ampl})
+## Return a sinetone of frequency @var{freq} with length of @var{sec}
+## seconds at sampling rate @var{rate} and with amplitude @var{ampl}.
+## The arguments @var{freq} and @var{ampl} may be vectors of common size.
+##
+## Defaults are @var{rate} = 8000, @var{sec} = 1 and @var{ampl} = 64.
+## @end deftypefn
+
+## Author: FL <Friedrich.Leisch@ci.tuwien.ac.at>
+## Description: Compute a sine tone
+
+function retval = sinetone (freq, rate, sec, ampl)
+
+ if (nargin == 1)
+ rate = 8000;
+ sec = 1;
+ ampl = 64;
+ elseif (nargin == 2)
+ sec = 1;
+ ampl = 64;
+ elseif (nargin == 3)
+ ampl = 64;
+ elseif ((nargin < 1) || (nargin > 4))
+ print_usage ();
+ endif
+
+ [err, freq, ampl] = common_size (freq, ampl);
+ if (err || ! isvector (freq))
+ error ("sinetone: FREQ and AMPL must be vectors of common size");
+ endif
+
+ if (! (isscalar (rate) && isscalar (sec)))
+ error ("sinetone: RATE and SEC must be scalars");
+ endif
+
+ n = length (freq);
+ ns = round (rate * sec);
+
+ retval = zeros (ns, n);
+
+ for k = 1:n
+ retval (:, k) = ampl(k) * sin (2 * pi * (1:ns) / rate * freq(k))';
+ endfor
+
+endfunction
+
+
+%!assert (size (sinetone (18e6, 150e6, 19550/150e6, 1)), [19550, 1]);