Mercurial > octave-nkf
view scripts/audio/mu2lin.m @ 20266:83792dd9bcc1
Use in-place operators in m-files where possible.
* scripts/audio/@audioplayer/set.m, scripts/audio/@audiorecorder/set.m,
scripts/audio/mu2lin.m, scripts/elfun/cosd.m, scripts/general/del2.m,
scripts/general/profexplore.m, scripts/general/quadl.m, scripts/general/rat.m,
scripts/general/rotdim.m, scripts/help/get_first_help_sentence.m,
scripts/help/private/__strip_html_tags__.m, scripts/image/cubehelix.m,
scripts/io/textread.m, scripts/linear-algebra/duplication_matrix.m,
scripts/linear-algebra/housh.m, scripts/linear-algebra/krylov.m,
scripts/linear-algebra/logm.m, scripts/linear-algebra/normest.m,
scripts/linear-algebra/onenormest.m, scripts/optimization/fminsearch.m,
scripts/optimization/lsqnonneg.m, scripts/optimization/qp.m,
scripts/plot/appearance/annotation.m, scripts/plot/appearance/axis.m,
scripts/plot/appearance/legend.m, scripts/plot/appearance/specular.m,
scripts/plot/draw/colorbar.m, scripts/plot/draw/hist.m,
scripts/plot/draw/plotmatrix.m, scripts/plot/draw/private/__stem__.m,
scripts/plot/util/__actual_axis_position__.m,
scripts/plot/util/__gnuplot_drawnow__.m, scripts/plot/util/findobj.m,
scripts/plot/util/print.m, scripts/plot/util/private/__go_draw_axes__.m,
scripts/plot/util/private/__print_parse_opts__.m, scripts/plot/util/rotate.m,
scripts/polynomial/pchip.m, scripts/polynomial/polyaffine.m,
scripts/polynomial/polyder.m, scripts/polynomial/private/__splinefit__.m,
scripts/polynomial/residue.m, scripts/signal/arch_fit.m,
scripts/signal/arch_rnd.m, scripts/signal/bartlett.m,
scripts/signal/blackman.m, scripts/signal/freqz.m, scripts/signal/hamming.m,
scripts/signal/hanning.m, scripts/signal/spectral_adf.m,
scripts/signal/spectral_xdf.m, scripts/signal/stft.m,
scripts/sparse/bicgstab.m, scripts/sparse/cgs.m,
scripts/sparse/private/__sprand_impl__.m, scripts/sparse/qmr.m,
scripts/sparse/sprandsym.m, scripts/sparse/svds.m, scripts/specfun/legendre.m,
scripts/special-matrix/gallery.m, scripts/statistics/base/gls.m,
scripts/statistics/models/logistic_regression.m,
scripts/statistics/tests/kruskal_wallis_test.m,
scripts/statistics/tests/manova.m, scripts/statistics/tests/wilcoxon_test.m,
scripts/time/datevec.m:
Use in-place operators in m-files where possible.
author | Rik <rik@octave.org> |
---|---|
date | Tue, 26 May 2015 21:07:42 -0700 |
parents | 7503499a252b |
children |
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## Copyright (C) 1995-2015 John W. Eaton ## ## This file is part of Octave. ## ## Octave is free software; you can redistribute it and/or modify it ## under the terms of the GNU General Public License as published by ## the Free Software Foundation; either version 3 of the License, or (at ## your option) any later version. ## ## Octave is distributed in the hope that it will be useful, but ## WITHOUT ANY WARRANTY; without even the implied warranty of ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU ## General Public License for more details. ## ## You should have received a copy of the GNU General Public License ## along with Octave; see the file COPYING. If not, see ## <http://www.gnu.org/licenses/>. ## -*- texinfo -*- ## @deftypefn {Function File} {} mu2lin (@var{x}, @var{n}) ## Convert audio data from mu-law to linear. ## ## Mu-law values are 8-bit unsigned integers. Linear values use @var{n}-bit ## signed integers or floating point values in the range -1@leq{}y@leq{}1 if ## @var{n} is 0. ## ## If @var{n} is not specified it defaults to 0. ## @seealso{lin2mu} ## @end deftypefn ## Author: Andreas Weingessel <Andreas.Weingessel@ci.tuwien.ac.at> ## Created: 18 October 1994 ## Adapted-By: jwe function y = mu2lin (x, n = 0) if (nargin == 2) if (n != 0 && n != 8 && n != 16) error ("mu2lin: N must be either 0, 8, or 16"); endif elseif (nargin != 1) print_usage (); endif ulaw = [32124, 31100, 30076, 29052, 28028, 27004, 25980, 24956, ... 23932, 22908, 21884, 20860, 19836, 18812, 17788, 16764, ... 15996, 15484, 14972, 14460, 13948, 13436, 12924, 12412, ... 11900, 11388, 10876, 10364, 9852, 9340, 8828, 8316, ... 7932, 7676, 7420, 7164, 6908, 6652, 6396, 6140, ... 5884, 5628, 5372, 5116, 4860, 4604, 4348, 4092, ... 3900, 3772, 3644, 3516, 3388, 3260, 3132, 3004, ... 2876, 2748, 2620, 2492, 2364, 2236, 2108, 1980, ... 1884, 1820, 1756, 1692, 1628, 1564, 1500, 1436, ... 1372, 1308, 1244, 1180, 1116, 1052, 988, 924, ... 876, 844, 812, 780, 748, 716, 684, 652, ... 620, 588, 556, 524, 492, 460, 428, 396, ... 372, 356, 340, 324, 308, 292, 276, 260, ... 244, 228, 212, 196, 180, 164, 148, 132, ... 120, 112, 104, 96, 88, 80, 72, 64, ... 56, 48, 40, 32, 24, 16, 8, 0 ]; ulaw = [ -ulaw, ulaw ]; ## Set the shape of y to that of x overwrites the contents of y with ## ulaw of x. y = x; y(:) = ulaw(x + 1); ## Convert to real or 8-bit. if (n == 0) ## [ -32768, 32767 ] -> [ -1, 1) y /= 32768; elseif (n == 8) ld = max (abs (y (:))); if (ld < 16384 && ld > 0) sc = 64 / ld; else sc = 1 / 256; endif y = fix (y * sc); endif endfunction