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## Copyright (C) 1995-2013 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])
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