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diff --git a/octave_packages/m/signal/sinetone.m b/octave_packages/m/signal/sinetone.m
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+## 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]);