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1 ## Copyright (C) 1995, 1996, 1997 Friedrich Leisch |
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2 ## |
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3 ## This file is part of Octave. |
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4 ## |
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5 ## Octave is free software; you can redistribute it and/or modify it |
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6 ## under the terms of the GNU General Public License as published by |
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7 ## the Free Software Foundation; either version 2, or (at your option) |
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8 ## any later version. |
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9 ## |
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10 ## Octave is distributed in the hope that it will be useful, but |
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11 ## WITHOUT ANY WARRANTY; without even the implied warranty of |
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12 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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13 ## General Public License for more details. |
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14 ## |
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15 ## You should have received a copy of the GNU General Public License |
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16 ## along with Octave; see the file COPYING. If not, write to the Free |
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17 ## Software Foundation, 59 Temple Place - Suite 330, Boston, MA |
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18 ## 02111-1307, USA. |
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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 usage ("sinetone (freq, rate, sec, ampl)"); |
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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 |
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58 retval = zeros (r * s, n); |
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59 for k = 1:n |
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60 retval (:, k) = a(k) * sin (2 * pi * (1:r*s) / r * f(k))'; |
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61 endfor |
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62 |
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63 endfunction |
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64 |
