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1 ## Copyright (C) 1995, 1996, 1997, 1998, 2000, 2002, 2005, 2006, 2007, 2008 |
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2 ## Friedrich Leisch |
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3 ## |
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4 ## This file is part of Octave. |
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5 ## |
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6 ## Octave is free software; you can redistribute it and/or modify it |
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7 ## under the terms of the GNU General Public License as published by |
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8 ## the Free Software Foundation; either version 3 of the License, or (at |
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9 ## your option) any later version. |
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10 ## |
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11 ## Octave is distributed in the hope that it will be useful, but |
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12 ## WITHOUT ANY WARRANTY; without even the implied warranty of |
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13 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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14 ## General Public License for more details. |
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15 ## |
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16 ## You should have received a copy of the GNU General Public License |
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17 ## along with Octave; see the file COPYING. If not, see |
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18 ## <http://www.gnu.org/licenses/>. |
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19 |
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20 ## -*- texinfo -*- |
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21 ## @deftypefn {Function File} {} sinetone (@var{freq}, @var{rate}, @var{sec}, @var{ampl}) |
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22 ## Return a sinetone of frequency @var{freq} with length of @var{sec} |
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23 ## seconds at sampling rate @var{rate} and with amplitude @var{ampl}. |
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24 ## The arguments @var{freq} and @var{ampl} may be vectors of common size. |
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25 ## |
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26 ## Defaults are @var{rate} = 8000, @var{sec} = 1 and @var{ampl} = 64. |
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27 ## @end deftypefn |
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28 |
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29 ## Author: FL <Friedrich.Leisch@ci.tuwien.ac.at> |
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30 ## Description: Compute a sine tone |
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31 |
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32 function retval = sinetone (f, r, s, a) |
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33 |
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34 if (nargin == 1) |
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35 r = 8000; |
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36 s = 1; |
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37 a = 64; |
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38 elseif (nargin == 2) |
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39 s = 1; |
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40 a = 64; |
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41 elseif (nargin == 3) |
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42 a = 64; |
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43 elseif ((nargin < 1) || (nargin > 4)) |
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44 print_usage (); |
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45 endif |
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46 |
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47 [err, f, a] = common_size (f, a); |
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48 if (err || ! isvector (f)) |
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49 error ("sinetone: freq and ampl must be vectors of common size"); |
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50 endif |
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51 |
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52 if (! (isscalar (r) && isscalar (s))) |
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53 error ("sinetone: rate and sec must be scalars"); |
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54 endif |
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55 |
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56 n = length (f); |
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57 ns = round (r * s); |
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58 |
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59 retval = zeros (ns, n); |
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60 |
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61 for k = 1:n |
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62 retval (:, k) = a(k) * sin (2 * pi * (1:ns) / r * f(k))'; |
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63 endfor |
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64 |
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65 endfunction |
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66 |
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67 %!assert (size (sinetone (18e6, 150e6, 19550/150e6, 1)), [19550, 1]); |
