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maint: miscellaneous style fixes for .m files * audio/mu2lin.m, deprecated/cut.m, general/cplxpair.m, general/genvarname.m, geometry/rectint.m, help/gen_doc_cache.m, image/hsv2rgb.m, image/rainbow.m, io/textscan.m, miscellaneous/bzip2.m, miscellaneous/compare_versions.m, miscellaneous/fact.m, miscellaneous/menu.m, optimization/fminbnd.m, optimization/fminunc.m, optimization/fzero.m, optimization/sqp.m, plot/__gnuplot_drawnow__.m, plot/axis.m, plot/findobj.m, plot/legend.m, plot/peaks.m, plot/private/__errplot__.m, plot/private/__fltk_print__.m, plot/private/__go_draw_axes__.m, plot/private/__patch__.m, polynomial/pchip.m, polynomial/residue.m, signal/periodogram.m, sparse/sprandsym.m, statistics/base/moment.m, statistics/distributions/expcdf.m, statistics/distributions/expinv.m, statistics/distributions/exppdf.m, statistics/tests/prop_test_2.m, statistics/tests/sign_test.m, statistics/tests/t_test.m, statistics/tests/t_test_2.m, statistics/tests/t_test_regression.m, strings/regexptranslate.m, time/datetick.m: Style fixes.
author John W. Eaton <jwe@octave.org>
date Wed, 11 Apr 2012 22:07:00 -0400
parents 72c96de7a403
children 1c89599167a6
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1 ## Copyright (C) 1995-2012 John W. Eaton
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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 3 of the License, or (at
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8 ## your option) 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, see
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17 ## <http://www.gnu.org/licenses/>.
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18
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19 ## -*- texinfo -*-
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20 ## @deftypefn {Function File} {} mu2lin (@var{x}, @var{n})
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21 ## Convert audio data from mu-law to linear. Mu-law values are 8-bit
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22 ## unsigned integers. Linear values use @var{n}-bit signed integers
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23 ## or floating point values in the range -1@leq{}y@leq{}1 if @var{n}
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24 ## is 0.
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25 ##
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26 ## If @var{n} is not specified it defaults to 0.
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27 ## @seealso{lin2mu, loadaudio, saveaudio}
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28 ## @end deftypefn
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29
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30 ## Author: Andreas Weingessel <Andreas.Weingessel@ci.tuwien.ac.at>
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31 ## Created: 18 October 1994
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32 ## Adapted-By: jwe
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33
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34 function y = mu2lin (x, n = 0)
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35
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36 if (nargin == 2)
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37 if (n != 0 && n != 8 && n != 16)
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38 error ("mu2lin: N must be either 0, 8, or 16");
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39 endif
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40 elseif (nargin != 1)
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41 print_usage ();
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42 endif
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43
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44 ulaw = [32124, 31100, 30076, 29052, 28028, 27004, 25980, 24956, ...
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59 56, 48, 40, 32, 24, 16, 8, 0 ];
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60
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61 ulaw = [ -ulaw, ulaw ];
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62
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63 ## Set the shape of y to that of x overwrites the contents of y with
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64 ## ulaw of x.
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65 y = x;
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66 y(:) = ulaw (x + 1);
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67
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68 ## Convert to real or 8-bit.
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69 if (n == 0)
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70 ## [ -32768, 32767 ] -> [ -1, 1)
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71 y = y/32768;
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72 elseif (n == 8)
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73 ld = max (abs (y (:)));
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74 if (ld < 16384 && ld > 0)
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75 sc = 64 / ld;
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76 else
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77 sc = 1 / 256;
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78 endif
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79 y = fix (y * sc);
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80 endif
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81
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82 endfunction