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1 ## Copyright (C) 1995, 1996, 1997 Friedrich Leisch |
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2 ## |
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3 ## This program is free software; you can redistribute it and/or modify |
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4 ## it under the terms of the GNU General Public License as published by |
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5 ## the Free Software Foundation; either version 2, or (at your option) |
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6 ## any later version. |
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7 ## |
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8 ## This program is distributed in the hope that it will be useful, but |
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9 ## WITHOUT ANY WARRANTY; without even the implied warranty of |
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10 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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11 ## General Public License for more details. |
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12 ## |
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13 ## You should have received a copy of the GNU General Public License |
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14 ## along with this file. If not, write to the Free Software Foundation, |
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15 ## 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
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16 |
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17 ## -*- texinfo -*- |
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18 ## @deftypefn {Function File} {} sinetone (@var{freq}, @var{rate}, @var{sec}, @var{ampl}) |
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19 ## Return a sinetone of frequency @var{freq} with length of @var{sec} |
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20 ## seconds at sampling rate @var{rate} and with amplitude @var{ampl}. |
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21 ## The arguments @var{freq} and @var{ampl} may be vectors of common size. |
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22 ## |
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23 ## Defaults are @var{rate} = 8000, @var{sec} = 1 and @var{ampl} = 64. |
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24 ## @end deftypefn |
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25 |
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26 ## Author: FL <Friedrich.Leisch@ci.tuwien.ac.at> |
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27 ## Description: Compute a sine tone |
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28 |
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29 function retval = sinetone (f, r, s, a) |
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30 |
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31 if (nargin == 1) |
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32 r = 8000; |
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33 s = 1; |
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34 a = 64; |
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35 elseif (nargin == 2) |
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36 s = 1; |
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37 a = 64; |
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38 elseif (nargin == 3) |
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39 a = 64; |
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40 elseif ((nargin < 1) || (nargin > 4)) |
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41 usage ("sinetone (freq, rate, sec, ampl)"); |
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42 endif |
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43 |
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44 [err, f, a] = common_size (f, a); |
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45 if (err || ! is_vector (f)) |
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46 error ("sinetone: freq and ampl must be vectors of common size"); |
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47 endif |
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48 |
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49 if (! (is_scalar (r) && is_scalar (s))) |
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50 error ("sinetone: rate and sec must be scalars"); |
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51 endif |
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52 |
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53 n = length (f); |
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54 |
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55 retval = zeros (r * s, n); |
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56 for k = 1:n |
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57 retval (:, k) = a(k) * sin (2 * pi * (1:r*s) / r * f(k))'; |
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58 endfor |
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59 |
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60 endfunction |
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61 |
