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annotate scripts/signal/sinetone.m @ 3191:e4f4b2d26ee9

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[project @ 1998-10-23 05:43:59 by jwe]
author jwe
date Fri, 23 Oct 1998 05:44:01 +0000
parents
children f8dde1807dee
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3191
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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 ## usage: sinetone (freq [, rate [, sec [, ampl]]])
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18 ##
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19 ## Returns a sinetone of frequency freq with length of sec seconds at
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20 ## sampling rate rate and with amplitude ampl. freq and ampl may be
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21 ## vectors of common size.
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22 ##
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23 ## Defaults are rate = 8000, sec = 1 and ampl = 64.
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24
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25 ## Author: FL <Friedrich.Leisch@ci.tuwien.ac.at>
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26 ## Description: Compute a sine tone
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27
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28 function retval = sinetone (f, r, s, a)
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29
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30 if (nargin == 1)
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31 r = 8000;
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32 s = 1;
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33 a = 64;
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34 elseif (nargin == 2)
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35 s = 1;
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36 a = 64;
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37 elseif (nargin == 3)
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38 a = 64;
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39 elseif ((nargin < 1) || (nargin > 4))
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40 usage ("sinetone (freq [, rate [, sec [, ampl]]])");
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41 endif
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42
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43 [err, f, a] = common_size (f, a);
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44 if (err || ! is_vector (f))
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45 error ("sinetone: freq and ampl must be vectors of common size");
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46 endif
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47
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48 if !(is_scalar (r) && is_scalar (s))
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49 error ("sinetone: rate and sec must be scalars");
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50 endif
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51
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52 n = length (f);
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53
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54 retval = zeros (r * s, n);
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55 for k = 1:n
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56 retval (:, k) = a(k) * sin (2 * pi * (1:r*s) / r * f(k))';
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57 endfor
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58
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59 endfunction
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60